Sudden cardiac versus non-cardiac death: Difference between revisions

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[[Sudden cardiac death]] is a natural, rapid, unexpected death secondary to [[cardiac]] cause or mechanism. [[Sudden cardiac arrest]] is defined as the unexpected cessation of pumping blood into vital organs due to electrical disturbance in the pathway of [[SA node]], [[AV node]], [[Hiss Purkinje fibers]] or pumping failure due to conditions such as [[cardiogenic shock]], [[massive pulmonary thromboembolism]],[[fulminant myocarditis]], [[ruptured left ventricular free wall]]. Without any intervention for immediate restoration of the [[circulation]], [[biologic death]] or [[sudden cardiac death]] will happen minutes to weeks after [[cardiac arrest]]. [[Sudden cardiac death]] is responsible for 50% of cardiac death annually in the united state. In-hospital [[cardiac arrest]] happens in 290,000 adults annually in the united states. The most common cause of [[sudden cardiac death]] is [[coronary artery disease]] and [[atherosclerosis]] process. The presence of underlying disorders such as [[malignancy]] or [[liver disease]] at the time of cardiac arrest makes the condition worst. Patients with acute [[myocardial infarction]] and [[in-hospital cardiac arrest]] with shockable [[rhythm]] have a better prognosis. Post [[cardiopulmonary resuscitation]] state management should be focused on [[neurologic]] complications, [[hemodynamic]] stability, and [[respiratory]] support.
[[Sudden cardiac death]] is a natural, rapid, unexpected death secondary to [[cardiac]] cause or mechanism. [[Sudden cardiac arrest]] is defined as the unexpected cessation of pumping blood into vital organs due to electrical disturbance in the pathway of [[SA node]], [[AV node]], [[Hiss Purkinje fibers]] or pumping failure due to conditions such as [[cardiogenic shock]], [[massive pulmonary thromboembolism]],[[fulminant myocarditis]], [[ruptured left ventricular free wall]]. Without any intervention for immediate restoration of the [[circulation]], [[biologic death]] or [[sudden cardiac death]] will happen minutes to weeks after [[cardiac arrest]]. [[Sudden cardiac death]] is responsible for 50% of cardiac death annually in the united state. In-hospital [[cardiac arrest]] happens in 290,000 adults annually in the united states. The most common cause of [[sudden cardiac death]] is [[coronary artery disease]] and [[atherosclerosis]] process. The presence of underlying disorders such as [[malignancy]] or [[liver disease]] at the time of cardiac arrest makes the condition worst. Patients with acute [[myocardial infarction]] and [[in-hospital cardiac arrest]] with shockable [[rhythm]] have a better prognosis. Post [[cardiopulmonary resuscitation]] state management should be focused on [[neurologic]] complications, [[hemodynamic]] stability, and [[respiratory]] support.


==Historical Perspective==
There is no historical perspective available about sudden cardiac death.
==Classification==
There are some definitions related to [[cardiac arrest]] including:<ref name="PrioriBlomström-Lundqvist2015">{{cite journal|last1=Priori|first1=Silvia G.|last2=Blomström-Lundqvist|first2=Carina|last3=Mazzanti|first3=Andrea|last4=Blom|first4=Nico|last5=Borggrefe|first5=Martin|last6=Camm|first6=John|last7=Elliott|first7=Perry Mark|last8=Fitzsimons|first8=Donna|last9=Hatala|first9=Robert|last10=Hindricks|first10=Gerhard|last11=Kirchhof|first11=Paulus|last12=Kjeldsen|first12=Keld|last13=Kuck|first13=Karl-Heinz|last14=Hernandez-Madrid|first14=Antonio|last15=Nikolaou|first15=Nikolaos|last16=Norekvål|first16=Tone M.|last17=Spaulding|first17=Christian|last18=Van Veldhuisen|first18=Dirk J.|title=2015 ESC Guidelines for the management of patients with ventricular arrhythmias and the prevention of sudden cardiac death|journal=European Heart Journal|volume=36|issue=41|year=2015|pages=2793–2867|issn=0195-668X|doi=10.1093/eurheartj/ehv316}}</ref>
{| style="border: 2px solid #4479BA; align="left"
! style="width: 200px; background: #4479BA;" | {{fontcolor|#FFF|Classification}}
! style="width: 300px; background: #4479BA;" | {{fontcolor|#FFF| Definition }}
|-
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | [[Sudden cardiac death]]
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | Sudden and unexpected death within one hour of being symptomatic or whitin 24 hours in asymptomatic patient due to [[arrhythmia]] or hemodynamic instability
|-
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | [[Sudden cardiac arrest]]
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | Suddenly cessation of [[cardiac activity]],unresponsive patient with [[gasping respiration]] or no [[respiratory]] movement and unpalpable pulses due to cardiac etiology such as [[arrhythmia]], [[pump failure]] or non cardiac etiology  such as [[trauma]], [[respiratory failure]], [[electrolytes disturbance]], [[drug overdose]], [[drowning]], [[asphexia]]
|-
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | [[Aborted cardiac arrest]]
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | Unexpected circulatory collapse within one hour of being symptomatic, which is turned back after successful [[cardiopulmonary resuscitation]]
|-
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | [[SIDS]] ([[sudden infant death syndrome]]),[[SADS]] ([[sudden arrhythmic death syndrome]])
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | Structurally normal heart without any specific findings in  autopsy or toxicology
|-
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" |[[SUDI]] ([[sudden unexplained death in infancy]]), [[SUDS]] (sudden
unexplained death syndrome)
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | [[Sudden death]] without any specific findings in autopsy in adult ([[SUDS]]) or infants less than 1 year ([[SUDI]])
|}
{{clear}}
*The table below provides information on the characteristics of [[sudden cardiac arrest]] in terms of [[ECG]] appearance:
{| border="3"
|+
! style="background: #4479BA; width: 150px;" | {{fontcolor|#FFF| Classification}}
! style="background: #4479BA; width: 150px;" | {{fontcolor|#FFF| Causes}}
! style="background: #4479BA; width: 150px;" | {{fontcolor|#FFF| ECG Characteristics}}
! style="background: #4479BA; width: 150px;" | {{fontcolor|#FFF| ECG view}}
|-
! style="padding: 5px 5px; background: #DCDCDC; " align="left"| '''[[Ventricular tachycardia]]''' <ref name="AjijolaTung2014">{{cite journal|last1=Ajijola|first1=Olujimi A.|last2=Tung|first2=Roderick|last3=Shivkumar|first3=Kalyanam|title=Ventricular tachycardia in ischemic heart disease substrates|journal=Indian Heart Journal|volume=66|year=2014|pages=S24–S34|issn=00194832|doi=10.1016/j.ihj.2013.12.039}}</ref><ref name="Meja LopezMalhotra2019">{{cite journal|last1=Meja Lopez|first1=Eliany|last2=Malhotra|first2=Rohit|title=Ventricular Tachycardia in Structural Heart Disease|journal=Journal of Innovations in Cardiac Rhythm Management|volume=10|issue=8|year=2019|pages=3762–3773|issn=21563977|doi=10.19102/icrm.2019.100801}}</ref><ref name="CoughtrieBehr2017">{{cite journal|last1=Coughtrie|first1=Abigail L|last2=Behr|first2=Elijah R|last3=Layton|first3=Deborah|last4=Marshall|first4=Vanessa|last5=Camm|first5=A John|last6=Shakir|first6=Saad A W|title=Drugs and life-threatening ventricular arrhythmia risk: results from the DARE study cohort|journal=BMJ Open|volume=7|issue=10|year=2017|pages=e016627|issn=2044-6055|doi=10.1136/bmjopen-2017-016627}}</ref><ref name="El-Sherif2001">{{cite journal|last1=El-Sherif|first1=Nabil|title=Mechanism of Ventricular Arrhythmias in the Long QT Syndrome: On Hermeneutics|journal=Journal of Cardiovascular Electrophysiology|volume=12|issue=8|year=2001|pages=973–976|issn=1045-3873|doi=10.1046/j.1540-8167.2001.00973.x}}</ref><ref name="de RivaWatanabe2015">{{cite journal|last1=de Riva|first1=Marta|last2=Watanabe|first2=Masaya|last3=Zeppenfeld|first3=Katja|title=Twelve-Lead ECG of Ventricular Tachycardia in Structural Heart Disease|journal=Circulation: Arrhythmia and Electrophysiology|volume=8|issue=4|year=2015|pages=951–962|issn=1941-3149|doi=10.1161/CIRCEP.115.002847}}</ref>
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
*[[Ischemic heart disease]]
*Illicit drug use such as [[cocaine]] and [[methamphetamine]]
*[[Structural heart diseases]]
*[[Electrolyte disturbances]]
*[[Congestive heart failure]]
*[[Myocarditis]]
*[[Obstructive sleep apnea]]
*[[Pulmonary artery catheter]]
*[[Long QT syndrome]]
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
*[[Ventricular tachycardia]] originates from a [[ventricular]] focus.
* Lasts more than 30 seconds.
* [[Broad QRS complex]]es: rate of >90 BPM.
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
[[File:Capture V tach.PNG|center|300px]]<ref> ECG found in of https://en.ecgpedia.org/index.php?title=Main_Page </ref>
|-
! style="padding: 5px 5px; background: #DCDCDC; " align="left"| '''[[Ventricular fibrillation]]''' <ref name="pmid19252119">{{cite journal |vauthors=Koplan BA, Stevenson WG |title=Ventricular tachycardia and sudden cardiac death |journal=Mayo Clin. Proc. |volume=84 |issue=3 |pages=289–97 |date=March 2009 |pmid=19252119 |pmc=2664600 |doi=10.1016/S0025-6196(11)61149-X |url=}}</ref><ref name="pmid28222965">{{cite journal |vauthors=Maury P, Sacher F, Rollin A, Mondoly P, Duparc A, Zeppenfeld K, Hascoet S |title=Ventricular arrhythmias and sudden death in tetralogy of Fallot |journal=Arch Cardiovasc Dis |volume=110 |issue=5 |pages=354–362 |date=May 2017 |pmid=28222965 |doi=10.1016/j.acvd.2016.12.006 |url=}}</ref><ref name="pmid1638716">{{cite journal |vauthors=Saumarez RC, Camm AJ, Panagos A, Gill JS, Stewart JT, de Belder MA, Simpson IA, McKenna WJ |title=Ventricular fibrillation in hypertrophic cardiomyopathy is associated with increased fractionation of paced right ventricular electrograms |journal=Circulation |volume=86 |issue=2 |pages=467–74 |date=August 1992 |pmid=1638716 |doi=10.1161/01.cir.86.2.467 |url=}}</ref><ref name="BektasSoyuncu2012">{{cite journal|last1=Bektas|first1=Firat|last2=Soyuncu|first2=Secgin|title=Hypokalemia-induced Ventricular Fibrillation|journal=The Journal of Emergency Medicine|volume=42|issue=2|year=2012|pages=184–185|issn=07364679|doi=10.1016/j.jemermed.2010.05.079}}</ref>
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
*[[Coronary ischemia|Acute coronary ischemia]]
*[[cardiomyopathy|Cardiomyopathies]]
*[[Congenital heart disease]]
*[[Myocardial infarction]]
*[[Heart surgery]]
*[[Electrolyte abnormalities]]
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
* Poorly identifiable [[QRS complexes]] and absent [[P waves]]
* The [[heart rate]] is >300 BPM
*[[Rhythm]] is irregular
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
[[File:Capture VF.PNG|center|300px]]<ref> ECG found in https://en.ecgpedia.org/index.php?title=Main_Page </ref>
|-
! style="padding: 5px 5px; background: #DCDCDC; " align="left"| '''[[Ventricular flutter]]''' <ref name="ThiesBoos2000">{{cite journal|last1=Thies|first1=Karl-Christian|last2=Boos|first2=Karin|last3=Müller-Deile|first3=Kai|last4=Ohrdorf|first4=Wolfgang|last5=Beushausen|first5=Thomas|last6=Townsend|first6=Peter|title=Ventricular flutter in a neonate—severe electrolyte imbalance caused by urinary tract infection in the presence of urinary tract malformation|journal=The Journal of Emergency Medicine|volume=18|issue=1|year=2000|pages=47–50|issn=07364679|doi=10.1016/S0736-4679(99)00161-4}}</ref><ref name="KosterWellens1976">{{cite journal|last1=Koster|first1=Rudolph W.|last2=Wellens|first2=Hein J.J.|title=Quinidine-induced ventricular flutter and fibrillation without digitalis therapy|journal=The American Journal of Cardiology|volume=38|issue=4|year=1976|pages=519–523|issn=00029149|doi=10.1016/0002-9149(76)90471-9}}</ref><ref name="pmid250503">{{cite journal |vauthors=Dhurandhar RW, Nademanee K, Goldman AM |title=Ventricular tachycardia-flutter associated with disopyramide therapy: a report of three cases |journal=Heart Lung |volume=7 |issue=5 |pages=783–7 |date=1978 |pmid=250503 |doi= |url=}}</ref>
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
*[[Electrolyte disturbances]]
*[[Medications]] such as:
**[[Disopyramide]]
**[[Quinidine]]
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
*The [[ECG]] shows:
**A typical [[sinusoidal]] pattern
**Frequency of 300 bpm
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
[[File:Capture Ven Flu.PNG|center|300px]]<ref> ECG found in https://en.ecgpedia.org/index.php?title=Main_Page </ref>
|-
! style="padding: 5px 5px; background: #DCDCDC;" align="left" | '''[[Asystole]]''' <ref name="ACLS_2003_H_T">''ACLS: Principles and Practice''. p. 71-87. Dallas: American Heart Association, 2003. ISBN 0-87493-341-2.</ref><ref name="ACLS_2003_EP_HT">''ACLS for Experienced Providers''. p. 3-5. Dallas: American Heart Association, 2003. ISBN 0-87493-424-9.</ref>
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
*[[Hypovolemia]]
*[[Hypoxia (medical)|Hypoxia]]
*[[Acidosis]]
*[[Hypothermia|Hypothermia]]
*[[Hyperkalemia|Hyperkalemia]] or [[Hypokalemia|Hypokalemia]]
*[[Hypoglycemia|Hypoglycemia]]
*[[Cardiac tamponade|Cardiac Tamponade]]
*[[Tension pneumothorax|Tension pneumothorax]]
*[[Thrombosis|Thrombosis]]
*[[Myocardial infarction]]
*[[Thrombosis|Thrombosis]]
*[[Pulmonary embolism]]
*[[Cardiogenic shock]]
*Degeneration of the [[sinoatrial]] or [[atrioventricular]] nodes
*[[Ischemic stroke]]
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
* There is no electrical activity in the asystole
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
[[Image:Lead II rhythm generated asystole.JPG|center|300px]]<ref> ECG found in https://en.ecgpedia.org/index.php?title=Main_Page </ref>
|-
! style="padding: 5px 5px; background: #DCDCDC;" align="left" | '''[[Pulseless electrical activity]]''' <ref name="ECC_2005_7.2">"2005 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care - Part 7.2: Management of Cardiac Arrest." ''Circulation'' 2005; '''112''': IV-58 - IV-66.</ref><ref>Foster B, Twelve Lead Electrocardiography, 2nd edition, 2007</ref>
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
*[[Hypovolemia]]
*[[Hypoxia]]
*Hydrogen ions ([[Acidosis]])
*[[Hypothermia]]
*[[Electrolyte disturbances]]
*[[Hypoglycemia]]
*[[Tablets]] or [[Toxins]] (Drug overdose) such as [[beta blockers]], [[tricyclic antidepressants]], or [[calcium channel blockers]]
*[[Tamponade]]
*[[Tension pneumothorax]]
*[[Thrombosis]] ([[Myocardial infarction]])
*[[Thrombosis]] ([[Pulmonary embolism]])
*[[Trauma]] ([[Hypovolemia]] from [[blood loss]])
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
*Several ppattern are possible including:
**[[Normal sinus rhythm]]
**[[Sinus tachycardia]], with discernible [[P waves]] and [[QRS complexes]]
**[[Bradycardia]], with or without [[P waves]]
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
[[File:Capture PEA.PNG|center|300px]]<ref> ECG found in wikimedia Commons </ref>
|-
! style="padding: 5px 5px; background: #DCDCDC;" align="left" |'''[[Torsade de Pointes]]''' <ref name="pmid28674475">{{cite journal |vauthors=Li M, Ramos LG |title=Drug-Induced QT Prolongation And Torsades de Pointes |journal=P T |volume=42 |issue=7 |pages=473–477 |date=July 2017 |pmid=28674475 |pmc=5481298 |doi= |url=}}</ref><ref name="SharainMay2015">{{cite journal|last1=Sharain|first1=Korosh|last2=May|first2=Adam M.|last3=Gersh|first3=Bernard J.|title=Chronic Alcoholism and the Danger of Profound Hypomagnesemia|journal=The American Journal of Medicine|volume=128|issue=12|year=2015|pages=e17–e18|issn=00029343|doi=10.1016/j.amjmed.2015.06.051}}</ref><ref name="pmid11330748">{{cite journal |vauthors=Khan IA |title=Twelve-lead electrocardiogram of torsades de pointes |journal=Tex Heart Inst J |volume=28 |issue=1 |pages=69 |date=2001 |pmid=11330748 |pmc=101137 |doi= |url=}}</ref>
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
* *[[Electrolyte disturbances]]
*[[Medications]] such as:
**[[Amiodarone]]
**[[Azithromycin]]
**[[Clozapine]]
**[[Famotidine]]
**[[Flecainide]]
**[[Foscarnet]]
**[[Levofloxacin]]
**[[Lithium]]
**[[Mirtazapine]]
**[[Quetiapine]]
**[[Risperidone]]
**[[Tacrolimus]]
**[[Tamoxifen]]
**[[Ziprasidone]]
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
# Paroxysms of VT with irregular RR intervals.
# A [[ventricular]] rate between 200 and 250 beats per minute.
# Two or more cycles of [[QRS complex]]es with alternating polarity.
# Changing amplitude of the [[QRS complexes]] in each cycle in a sinusoidal fashion.
# Prolongation of the [[QT interval]].
# Is often initiated by a [[PVC]] with a long coupling interval, R on T phenomenon.
# There are usually 5 to 20 complexes in each cycle.
| style="padding: 5px 5px; background: #F5F5F5;" align="left" |
[[File:Capture Tors De P.PNG|center|300px]]<ref> ECG found in https://en.ecgpedia.org/index.php?title=Main_Page </ref>
|}
==Pathophysiology==
*The pathogenesis of [[cardiac arrest]] is characterized by the myocardial inflammatory process in the setting of [[atherosclerosis]], [[structural heart disease]], [[genetic disorders]], and environmental factors.
*The SCN5A, KCNH2, KCNQ1, RYR2, MYBPC3, PKP2, DSP genes mutation has been associated with the development of inherited causes of [[cardiac arrest]] and  [[sudden cardiac death]].<ref name="OsmanTan2019">{{cite journal|last1=Osman|first1=Junaida|last2=Tan|first2=Shing Cheng|last3=Lee|first3=Pey Yee|last4=Low|first4=Teck Yew|last5=Jamal|first5=Rahman|title=Sudden Cardiac Death (SCD) – risk stratification and prediction with molecular biomarkers|journal=Journal of Biomedical Science|volume=26|issue=1|year=2019|issn=1423-0127|doi=10.1186/s12929-019-0535-8}}</ref><ref name="MehtaCurwin1997">{{cite journal|last1=Mehta|first1=Davendra|last2=Curwin|first2=Jay|last3=Gomes|first3=J. Anthony|last4=Fuster|first4=Valentin|title=Sudden Death in Coronary Artery Disease|journal=Circulation|volume=96|issue=9|year=1997|pages=3215–3223|issn=0009-7322|doi=10.1161/01.CIR.96.9.3215}}</ref><ref name="Akhtar1991">{{cite journal|last1=Akhtar|first1=Masood|title=Sudden Cardiac Death: Management of High-Risk Patients|journal=Annals of Internal Medicine|volume=114|issue=6|year=1991|pages=499|issn=0003-4819|doi=10.7326/0003-4819-114-6-499}}</ref>
{{Family tree/start}}
{{Family tree | | | | A01 |-| A02 |-|A03|-|A04| |A01=
'''Structural and functional causes of [[sudden cardiac death]]'''
* [[Coronary artery disease]]
* [[Cardiomyopathy]]
* [[Valvular heart disease]]<ref name="BassoPerazzolo Marra2015">{{cite journal|last1=Basso|first1=Cristina|last2=Perazzolo Marra|first2=Martina|last3=Rizzo|first3=Stefania|last4=De Lazzari|first4=Manuel|last5=Giorgi|first5=Benedetta|last6=Cipriani|first6=Alberto|last7=Frigo|first7=Anna Chiara|last8=Rigato|first8=Ilaria|last9=Migliore|first9=Federico|last10=Pilichou|first10=Kalliopi|last11=Bertaglia|first11=Emanuele|last12=Cacciavillani|first12=Luisa|last13=Bauce|first13=Barbara|last14=Corrado|first14=Domenico|last15=Thiene|first15=Gaetano|last16=Iliceto|first16=Sabino|title=Arrhythmic Mitral Valve Prolapse and Sudden Cardiac Death|journal=Circulation|volume=132|issue=7|year=2015|pages=556–566|issn=0009-7322|doi=10.1161/CIRCULATIONAHA.115.016291}}</ref>
* [[Congenital heart disease]]
* [[Primary electrical abnormality]]
* [[Channelopathy]]|A02=
'''Trigger'''
*[[Myocardial infarction]]
*[[Myocardial ischemia]]/[[reperfusion]]
*Emotional, physical stress
*[[Hemodynamic decompensation]]
*[[Electrolyte imbalance]]
*[[Hypoxemia]],[[acidosis]]
*[[Neurophysiological interactions]]
*[[Drugs]]|
A03='''[[Arrhythmia]] mechanism'''
*[[Re-entry]]
*[[Automaticity]]
*[[Triggered activity]]
*[[Conduction block]]
*|A04=
'''Fatal [[arrhythmia]]'''
*Monomorphic [[ventricular tachycardia]]
*Polymorphic [[ventricular tachycardia]]
*[[Ventricular fibrillation]]
*Profound [[bradycardia]]
*[[Asystole]]
*[[Pulseless electrical activity]]|}}|
{{Family tree/end}}
==Causes==
[[Sudden cardiac arrest]]  may be caused by :
*[[Coronary artery abnormality]] such as  [[coronary atherosclerosis]], [[acute MI]], coronary artery embolism, [[coronary arteritis]]<ref name="MehtaCurwin1997">{{cite journal|last1=Mehta|first1=Davendra|last2=Curwin|first2=Jay|last3=Gomes|first3=J. Anthony|last4=Fuster|first4=Valentin|title=Sudden Death in Coronary Artery Disease|journal=Circulation|volume=96|issue=9|year=1997|pages=3215–3223|issn=0009-7322|doi=10.1161/01.CIR.96.9.3215}}</ref>
*[[Hypertrophy]] of [[myocardium]] such as [[HCM]], [[hypertensive heart disease]], primary or secondary [[pulmonary hypertension]]
*[[Myocardial disease ]] such as [[ischemic cardiomyopathy]], non-ischemic [[cardiomyopathy]], [[myocarditis]]<ref>{{cite journal|doi=10.1080/2F20961790.2019.1595352}}</ref>
*[[Valvular heart disease]]  such as [[aortic stenosis]],[[aortic insufficiency]], [[mitral valve prolapse]], [[endocarditis]] <ref name="BassoPerazzolo Marra2015">{{cite journal|last1=Basso|first1=Cristina|last2=Perazzolo Marra|first2=Martina|last3=Rizzo|first3=Stefania|last4=De Lazzari|first4=Manuel|last5=Giorgi|first5=Benedetta|last6=Cipriani|first6=Alberto|last7=Frigo|first7=Anna Chiara|last8=Rigato|first8=Ilaria|last9=Migliore|first9=Federico|last10=Pilichou|first10=Kalliopi|last11=Bertaglia|first11=Emanuele|last12=Cacciavillani|first12=Luisa|last13=Bauce|first13=Barbara|last14=Corrado|first14=Domenico|last15=Thiene|first15=Gaetano|last16=Iliceto|first16=Sabino|title=Arrhythmic Mitral Valve Prolapse and Sudden Cardiac Death|journal=Circulation|volume=132|issue=7|year=2015|pages=556–566|issn=0009-7322|doi=10.1161/CIRCULATIONAHA.115.016291}}</ref>
*[[Congenital heart disease]] such as [[congenital septal defect]] with [[Eisenmenger]] physiology<ref name="YapHarris2014">{{cite journal|last1=Yap|first1=Sing-Chien|last2=Harris|first2=Louise|title=Sudden cardiac death in adults with congenital heart disease|journal=Expert Review of Cardiovascular Therapy|volume=7|issue=12|year=2014|pages=1605–1620|issn=1477-9072|doi=10.1586/erc.09.153}}</ref>
*[[ Abnormality in conducting system]] such as [[wolf-Parkinson-white syndrome]]
*Electrical instability such as  ([[CPVT]], [[LQTS]])
===Causes of Sudden Death Including Sudden Cardiac Death by Organ System===
{|style="width:70%; height:100px" border="1"
|style="height:100px"; style="width:25%" border="1" bgcolor="LightSteelBlue" | '''Cardiovascular'''
|style="height:100px"; style="width:75%" border="1" bgcolor="Beige" |
Amyloid cardiopathy,
[[Congestive heart failure]],
Ventricular rupture,
|-
|-bgcolor="LightSteelBlue"
| '''* Ischemic'''
|bgcolor="Beige"|
[[Hypoxia]],
[[Coronary thrombosis]],
[[Coronary vasospasm]],
[[Coronary artery aneurysm]],
[[Prinzmetal's variant angina ]],
|-
|-bgcolor="LightSteelBlue"
| '''* Pericardial'''
|bgcolor="Beige"|
[[Cardiac tamponade]],
|-
|-bgcolor="LightSteelBlue"
| '''* Myocardial'''
|bgcolor="Beige"|
[[Asymmetric septal hypertrophy ]],
[[ST Elevation Myocardial Infarction]],
[[Dilated cardiomyopathy]],
[[Giant cell myocarditis ]],
[[Hypertrophic cardiomyopathy]],
Kugel-Stoloff syndrome ,
[[Myocardial infarction]],
[[Myocarditis]],
[[Rupture of the papillary muscles]],
|-
|-bgcolor="LightSteelBlue"
| '''* Endocardial/Valvular'''
|bgcolor="Beige"|
[[Mitral valve prolapse]],
[[Valvular aortic stenosis]]/insufficiency,
[[Mitral valve disruption]],
[[Endocarditis]],
[[Prosthetic valve dysfunction]],
|-
|-bgcolor="LightSteelBlue"
| '''* Conduction/Arrhythmia'''
|bgcolor="Beige"|
[[Arrhythmogenic right ventricular cardiomyopathy]],
[[Arrhythmogenic right ventricular dysplasia]],
[[Brugada syndrome]],
Jervell and Lange-Nielsen Syndrome,
[[Prolonged Q-T Interval Syndrome]],
[[Multifocal ventricular premature beats ]],
[[Naxos disease ]],
[[Romano-Ward syndrome ]],
[[Sick sinus syndrome]],
[[Short QT syndrome ]],
Sinus node disease,
[[Stokes-Adams Syndrome]],
Sudden Arrhythmia Death Syndrome,
[[Wolf-Parkinson-White syndrome]],
|-
|-bgcolor="LightSteelBlue"
| '''* Vascular'''
|bgcolor="Beige"|
[[Acute aortic insufficiency]],
[[Acute coronary syndrome]],
[[Aortic dissection]],
[[Aortic stenosis]],
Aorto-ventricular tunnel,
[[Arteritis]],
[[Coronary artery disease]],
Coronary arteries - congenital malformation ,
[[Ruptured abdominal aortic aneurysm]],
|-
|-bgcolor="LightSteelBlue"
| '''Congenital/Developmental'''
|bgcolor="Beige"|
Congenital aortic or pulmonary valve stenosis,
[[Congenital septal defect]] with eisenmenger physiology,
[[Congenital heart block ]],
Congenital Long QT syndrome,
[[Noncompaction Cardiomyopathy]],
[[Sudden Infant Death Syndrome]],
[[Uhl anomaly ]]
|-
|-bgcolor="LightSteelBlue"
| '''Chemical / poisoning'''
|bgcolor="Beige"|
[[Snake bite]]
|-
|-bgcolor="LightSteelBlue"
| '''Dermatologic'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Drug Side Effect'''
|bgcolor="Beige"| [[Agalsidase beta]], [[Articaine]], [[caspofungin acetate]], [[Clozapine]], [[cytomegalovirus immune globulin]], [[Drug allergy]], [[drug overdose]], [[Dornase Alfa]], [[ferumoxytol]], [[Flucytosine]], [[galsulfase]], [[Iodixanol]], [[laronidase]], [[Lincomycin Hydrochloride]], [[Polidocanol]], [[Potassium bicarbonate]], [[pramipexole]], [[prednisolone]], [[Ramucirumab]], [[Calcium gluconate]], [[Dextran]], [[Tiagabine]]
|-
|-bgcolor="LightSteelBlue"
| '''Ear Nose Throat'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Endocrine'''
|bgcolor="Beige"|
[[Catecholaminergic polymorphic ventricular tachycardia]],
Diabetic ketoacidosis - typically from undiagnosed diabetes,
[[Thyrotoxicosis]],
|-
|-bgcolor="LightSteelBlue"
| '''Environmental'''
|bgcolor="Beige"| [[Hypothermia]],
|-
|-bgcolor="LightSteelBlue"
| '''Gastroenterologic'''
|bgcolor="Beige"|
[[Appendicitis]],
[[Gastrointestinal bleeding]],
[[Retroperitoneal bleed]],
|-
|-bgcolor="LightSteelBlue"
| '''Genetic'''
|bgcolor="Beige"|
[[Brugada syndrome]],
3-methylglutaconic aciduria, type 1,
[[Familial dilated cardiomyopathy ]],
Familial hypertrophic cardiomyopathy 1,
Hyperbilirubinemia transient, familial neonatal,
[[Marfan syndrome ]],
[[Timothy syndrome ]]
|-
|-bgcolor="LightSteelBlue"
| '''Hematologic'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Iatrogenic'''
|bgcolor="Beige"| [[Transfusion reaction]]
|-
|-bgcolor="LightSteelBlue"
| '''Infectious Disease'''
|bgcolor="Beige"|
[[Flu]] mainly in the elderly, infants, infirm or chronically ill,
[[Neurocysticercosis ]], [[Lyme disease]]
|-
|-bgcolor="LightSteelBlue"
| '''Musculoskeletal / Ortho'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Neurologic'''
|bgcolor="Beige"|
[[Apoplexy]],
[[Encephalitis]],
[[Intracranial hemmorhage]],
[[Meningitis]],
[[Stroke]],
[[Subarachnoid hemorrhage]],
|-
|-bgcolor="LightSteelBlue"
| '''Nutritional / Metabolic'''
|bgcolor="Beige"|
3-methylglutaconic aciduria, type 1,
Alpha-ketoglutarate dehydrogenase deficiency ,
[[Food allergy]]
|-
|-bgcolor="LightSteelBlue"
| '''Obstetric/Gynecologic'''
|bgcolor="Beige"|
Amniotic fluid syndrome ,
Childbirth hemorrhage,
|-
|-bgcolor="LightSteelBlue"
| '''Oncologic'''
|bgcolor="Beige"|
Atrial myxoma, familial
|-
|-bgcolor="LightSteelBlue"
| '''Opthalmologic'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Overdose / Toxicity'''
|bgcolor="Beige"|
Opioid overdose  ,
Oxycontin [[overdose]],
Pain killer [[overdose]] ,
Sleeping pill [[overdose]]
|-
|-bgcolor="LightSteelBlue"
| '''Psychiatric'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Pulmonary'''
|bgcolor="Beige"|
[[Hypercapnia]],
[[Pickwickian Syndrome]],
[[Pulmonary embolism]],
[[Tension pneumothorax]],
[[Status asthmaticus]]
|-
|-bgcolor="LightSteelBlue"
| '''Renal / Electrolyte'''
|bgcolor="Beige"|
[[Hypercalcemia]],
[[Hypokalemia]],
[[Hyperkalemia]],
|-
|-bgcolor="LightSteelBlue"
| '''Rheum / Immune / Allergy'''
|bgcolor="Beige"|
[[Amyloidosis]],
[[Anaphylaxis]],
[[Myasthenia gravis]],
[[Sarcoidosis]],
|-
|-bgcolor="LightSteelBlue"
| '''Sexual'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Trauma'''
|bgcolor="Beige"|
[[Commotio cordis]],
Homicide,
Motor Vehicle accident
|-
|-bgcolor="LightSteelBlue"
| '''Urologic'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Miscellaneous'''
|bgcolor="Beige"|
[[Shock]],
[[Asphyxia]],
[[Insect bite]]
[[Sepsis syndrome]],
[[Shock]]
|-
|}
==Differentiating sudden cardiac death from non-cardiac causes==
{| class="wikitable"
|-
|-bgcolor="PeachPuff"
| '''Cardiac causes of [[sudden death]]'''
|bgcolor="PeachPuff"|
'''Non cardiac causes of [[sudden death]]:''' 
|-
|-bgcolor="PeachPuff"
|
*Acute [[aortic insufficiency]]
*[[Acute coronary syndrome]]
*[[Aortic dissection]]
*[[Aortic stenosis]]
*[[Arrhythmogenic right ventricular dysplasia]]
*[[Brugada syndrome]]
*[[Cardiac tamponade]]
*[[Cardiomyopathy]]
*[[Catecholaminergic polymorphic ventricular tachycardia]]
*[[Commotio cordis]]
*[[Complete heart block]]
*[[Congenital heart disease]]
*[[Congestive heart failure]]
*[[Coronary artery disease]]
*[[Dilated cardiomyopathy]]
*[[Hypertrophic cardiomyopathy]]
*[[Jervell and Lange-Nielsen syndrome]]
* [[Long QT syndrome]], both [[congenital]] and acquired
*[[Lyme disease]]
*[[Mitral valve prolapse]]<ref name="BassoPerazzolo Marra2015">{{cite journal|last1=Basso|first1=Cristina|last2=Perazzolo Marra|first2=Martina|last3=Rizzo|first3=Stefania|last4=De Lazzari|first4=Manuel|last5=Giorgi|first5=Benedetta|last6=Cipriani|first6=Alberto|last7=Frigo|first7=Anna Chiara|last8=Rigato|first8=Ilaria|last9=Migliore|first9=Federico|last10=Pilichou|first10=Kalliopi|last11=Bertaglia|first11=Emanuele|last12=Cacciavillani|first12=Luisa|last13=Bauce|first13=Barbara|last14=Corrado|first14=Domenico|last15=Thiene|first15=Gaetano|last16=Iliceto|first16=Sabino|title=Arrhythmic Mitral Valve Prolapse and Sudden Cardiac Death|journal=Circulation|volume=132|issue=7|year=2015|pages=556–566|issn=0009-7322|doi=10.1161/CIRCULATIONAHA.115.016291}}</ref>
*[[Myocarditis]]
*[[Naxos disease]]
*[[Noncompaction Cardiomyopathy]]
*[[Papillary muscle rupture]]
*[[Prolonged Q-T Interval Syndrome]]
*[[Pulmonary embolism]]
*[[Romano-Ward syndrome ]]
*[[Ruptured abdominal aortic aneurysm]]
*[[Prosthetic valve dysfunction]]
*[[Short QT syndrome]]
*[[Short QT syndrome type 1]]
*[[Short QT syndrome type 2]]
*[[Short QT syndrome type 3]]
*[[Short QT syndrome type 4]]
*[[Short QT syndrome type 5]]
*[[Sick sinus syndrome]]
*[[ST Elevation Myocardial Infarction]]
*[[Stokes-Adams Syndrome]]
*[[Sudden Infant Death Syndrome]]
*[[Timothy syndrome ]]
*[[Uhl anomaly ]]
*[[Valvular Heart Disease]]
*[[Ventricular rupture]]
*[[Wolf-Parkinson-White syndrome]] with rapid conduction
|bgcolor="PeachPuff"|
*3-methylglutaconic aciduria, type 1
*Alpha-ketoglutarate dehydrogenase deficiency
*Amniotic fluid syndrome
*Arterial dissections with lentiginosis
*[[Anaphylaxis]]
*[[Aneurysm]]
*[[Apoplexy]]
*[[Appendicitis]]
*[[Asphyxia]]
*Birth injury
*[[Bleeding]] excessive
*Childbirth hemorrhage
*Diabetic ketoacidosis - typically from undiagnosed diabetes
*[[Drug allergy]]
*[[Drug]] [[overdose]]
*[[Encephalitis]]
*[[Fetal death]]
*[[Food allergy]]
*[[Gastrointestinal bleeding]]
*Homicide
*Hyperbilirubinemia transient, familial, neonatal
*[[Hypercalcemia]]
*[[Hypercapnia]]
*[[Hyperkalemia]]
*[[Hypokalemia]]
*[[Hypoxia]]
*[[Injury]]
*[[Insect bite]]
*[[Intracranial hemmorhage]]
*[[Marfan syndrome ]]
*[[Meningitis]]
*[[Meningococcal disease]]
*Motor Vehicle accident
*Myasthenia Gravis
*[[Neurocysticercosis ]]
*Opioid [[overdose]] 
*[[Oxycontin]] [[overdose]]
*Pain killer [[overdose]]
*[[Pickwickian Syndrome]]
*[[Poisoning]]
*[[Pulmonary embolism]]
*[[Retroperitoneal bleed]]
*[[Sepsis syndrome]]
*[[Shock]]
*[[Sleep apnea ]]
*[[Snake bite]]
*[[Status asthmaticus]]
*[[Stillbirth]]
*[[Stroke]]
*[[Subarachnoid hemorrhage]]
*[[Sudden Infant Death Syndrome]]
*[[Suicide]]
*Sleeping pill [[overdose]]
*Toxic/metabolic disturbances
*Tranquilizer addiction
*[[Tension pneumothorax]]
* Toxic/metabolic disturbances
*[[Thyrotoxicosis]]
*[[Toxic shock syndrome]]
*[[Transfusion reaction]]
*[[Venom]]
|-
|}
==Epidemiology and Demographics==
* The prevalence of [[sudden cardiac death]] is approximately 1.40 per 100,000 individuals in women to 6.68 per 100.000 individuals in men worldwide.<ref name="PrioriBlomström-Lundqvist2015">{{cite journal|last1=Priori|first1=Silvia G.|last2=Blomström-Lundqvist|first2=Carina|last3=Mazzanti|first3=Andrea|last4=Blom|first4=Nico|last5=Borggrefe|first5=Martin|last6=Camm|first6=John|last7=Elliott|first7=Perry Mark|last8=Fitzsimons|first8=Donna|last9=Hatala|first9=Robert|last10=Hindricks|first10=Gerhard|last11=Kirchhof|first11=Paulus|last12=Kjeldsen|first12=Keld|last13=Kuck|first13=Karl-Heinz|last14=Hernandez-Madrid|first14=Antonio|last15=Nikolaou|first15=Nikolaos|last16=Norekvål|first16=Tone M.|last17=Spaulding|first17=Christian|last18=Van Veldhuisen|first18=Dirk J.|title=2015 ESC Guidelines for the management of patients with ventricular arrhythmias and the prevention of sudden cardiac death|journal=European Heart Journal|volume=36|issue=41|year=2015|pages=2793–2867|issn=0195-668X|doi=10.1093/eurheartj/ehv316}}</ref>
* In 2015, the incidence of adult in-hospital [[cardiac arrests]] was estimated to be 970 cases per 100,000 individuals in the united states.<ref name="HolmbergRoss2019">{{cite journal|last1=Holmberg|first1=Mathias J.|last2=Ross|first2=Catherine E.|last3=Fitzmaurice|first3=Garrett M.|last4=Chan|first4=Paul S.|last5=Duval-Arnould|first5=Jordan|last6=Grossestreuer|first6=Anne V.|last7=Yankama|first7=Tuyen|last8=Donnino|first8=Michael W.|last9=Andersen|first9=Lars W.|last10=Chan|first10=Paul|last11=Grossestreuer|first11=Anne V.|last12=Moskowitz|first12=Ari|last13=Edelson|first13=Dana|last14=Ornato|first14=Joseph|last15=Berg|first15=Katherine|last16=Peberdy|first16=Mary Ann|last17=Churpek|first17=Matthew|last18=Kurz|first18=Michael|last19=Starks|first19=Monique Anderson|last20=Girotra|first20=Saket|last21=Perman|first21=Sarah|last22=Goldberger|first22=Zachary|last23=Guerguerian|first23=Anne-Marie|last24=Atkins|first24=Dianne|last25=Foglia|first25=Elizabeth|last26=Fink|first26=Ericka|last27=Lasa|first27=Javier J.|last28=Roberts|first28=Joan|last29=Bembea|first29=Melanie|last30=Gaies|first30=Michael|last31=Kleinman|first31=Monica|last32=Gupta|first32=Punkaj|last33=Sutton|first33=Robert|last34=Sawyer|first34=Taylor|title=Annual Incidence of Adult and Pediatric In-Hospital Cardiac Arrest in the United States|journal=Circulation: Cardiovascular Quality and Outcomes|volume=12|issue=7|year=2019|issn=1941-7713|doi=10.1161/CIRCOUTCOMES.119.005580}}</ref>
===Age===
* [[Cardiac arrest]] is more commonly observed within the first year of life due to [[sudden infant death syndrome]] and also between 45-75 years old due to increased risk of [[coronary artery disease]].
* There is a significant decrease in [[sudden cardiac death]] at age 75 and older due to decreasing risk of [[coronary artery disease]].
===Gender===
*[[Men]] are more commonly affected with [[sudden cardiac death]] than [[women]] in all age groups.
===Race===
*[[Black]]  individuals are more likely to develop [[cardiac arrest]].<ref name="BeckerHan1993">{{cite journal|last1=Becker|first1=Lance B.|last2=Han|first2=Ben H.|last3=Meyer|first3=Peter M.|last4=Wright|first4=Fred A.|last5=Rhodes|first5=Karin V.|last6=Smith|first6=David W.|last7=Barrett|first7=John|title=Racial Differences in the Incidence of Cardiac Arrest and Subsequent Survival|journal=New England Journal of Medicine|volume=329|issue=9|year=1993|pages=600–606|issn=0028-4793|doi=10.1056/NEJM199308263290902}}</ref>
==Risk Factors==
*Common risk factors related to underlying [[coronary artery disease]] and inherited causes in the development of [[ sudden cardiac arrest]] are:<ref name="pmid20142817">{{cite journal |vauthors=Adabag AS, Luepker RV, Roger VL, Gersh BJ |title=Sudden cardiac death: epidemiology and risk factors |journal=Nat Rev Cardiol |volume=7 |issue=4 |pages=216–25 |date=April 2010 |pmid=20142817 |pmc=5014372 |doi=10.1038/nrcardio.2010.3 |url=}}</ref>
:*[[Hypertension]]
:*[[Male gender]]
:*[[Diabetes mellitus]]
:*[[Hyperlipidemia]]
:*[[Obesity]]
:*[[Smoking]]
:*[[Older age]]
:*[[Obstructive sleep apnea]] due to [[hypoxia]]
:*[[Early VF]] (within 48 hours of [[ACS]] increasing in-hospital mortality five times)
:*[[Early repolarization]] patten in early phase of [[MI]]<ref name="NaruseTada2012">{{cite journal|last1=Naruse|first1=Yoshihisa|last2=Tada|first2=Hiroshi|last3=Harimura|first3=Yoshie|last4=Hayashi|first4=Mayu|last5=Noguchi|first5=Yuichi|last6=Sato|first6=Akira|last7=Yoshida|first7=Kentaro|last8=Sekiguchi|first8=Yukio|last9=Aonuma|first9=Kazutaka|title=Early Repolarization Is an Independent Predictor of Occurrences of Ventricular Fibrillation in the Very Early Phase of Acute Myocardial Infarction|journal=Circulation: Arrhythmia and Electrophysiology|volume=5|issue=3|year=2012|pages=506–513|issn=1941-3149|doi=10.1161/CIRCEP.111.966952}}</ref>
:*Family history of [[sudden death]]
== Natural History, Complications and Prognosis==
Sudden cardiac arrest occurs due to sudden disturbance in cardiac electrical propagation or failure of the [[heart]] to pumping the [[blood]] into vital [[organs]].
*Early clinical features include abrupt [[palpitation]], [[presyncope]], [[syncope]], [[chest pain]], [[dyspnea]], [[hypotension]] within one hour before terminal event.
* Patients  may progress to develop [[cardiac arrest ]], [[sudden collapse]], [[loss of effective circulation]], [[loss of consciousness]].
* If left untreated or failed resuscitation, biological death may occur within minutes to weeks.
*Common complications in survivors of [[cardiac arrest]] include [[pneumonia]], [[gastrointestinal bleeding]], [[injuries]] related to [[resuscitation]], [[liver function test disturbance]], [[acure renal failure]], [[electrolytes disturbances]], [[seizure]].<ref name="Bjork1982">{{cite journal|last1=Bjork|first1=Randall J.|title=Medical Complications of Cardiopulmonary Arrest|journal=Archives of Internal Medicine|volume=142|issue=3|year=1982|pages=500|issn=0003-9926|doi=10.1001/archinte.1982.00340160080018}}</ref>
* Two-thirds of patients with out-of-hospital cardiac arrest admitted in intensive care unit die of neurological complications.
* Most of the in-hospital cardiac death occur due to multiorgans dysfunction and one forth death is due to [[neurological complications]]. <ref>{{cite journal|doi=10.1016/j.resuscitation.2019.01.031. Epub 2019 Jan 30.}}</ref>
*Factors associated poor prognosis after in hospital [[cardiac arrest]] include:<ref name="Chan2012">{{cite journal|last1=Chan|first1=Paul S.|title=A Validated Prediction Tool for Initial Survivors of In-Hospital Cardiac Arrest|journal=Archives of Internal Medicine|volume=172|issue=12|year=2012|pages=947|issn=0003-9926|doi=10.1001/archinternmed.2012.2050}}</ref><ref name="pmid21596693">{{cite journal |vauthors=Ebell MH, Afonso AM |title=Pre-arrest predictors of failure to survive after in-hospital cardiopulmonary resuscitation: a meta-analysis |journal=Fam Pract |volume=28 |issue=5 |pages=505–15 |date=October 2011 |pmid=21596693 |doi=10.1093/fampra/cmr023 |url=}}</ref>
:*Age > 70 years old
:* Concomitant underlying disorders such as [[pneumonia]], [[hypotension]], [[renal dysfunction]], [[hepatic dysfunction]]
:* Non shockable [[rhythm]] such as  [[asystole]] or [[pulseless electrical activity]]
* Factors associated with better prognosis after in-hospital cardiac arrest include:
:*Early detection of [[cardiac arrest]] or being a witness during arrest
:* Shockable [[rhythm]] such as [[VF]], [[VT]]
:* Women between 15-45 years old<ref name="pmid20228684">{{cite journal |vauthors=Topjian AA, Localio AR, Berg RA, Alessandrini EA, Meaney PA, Pepe PE, Larkin GL, Peberdy MA, Becker LB, Nadkarni VM |title=Women of child-bearing age have better inhospital cardiac arrest survival outcomes than do equal-aged men |journal=Crit Care Med |volume=38 |issue=5 |pages=1254–60 |date=May 2010 |pmid=20228684 |pmc=3934212 |doi=10.1097/CCM.0b013e3181d8ca43 |url=}}</ref>
*Prognosis of in-hospital cardiac arrest is generally better than out of hospital cardiac arrest and the 1-year survival rate of patients who survived to hospital discharge was approximately 25% in the GWTG-R registry.<ref name="ViraniAlonso2020">{{cite journal|last1=Virani|first1=Salim S.|last2=Alonso|first2=Alvaro|last3=Benjamin|first3=Emelia J.|last4=Bittencourt|first4=Marcio S.|last5=Callaway|first5=Clifton W.|last6=Carson|first6=April P.|last7=Chamberlain|first7=Alanna M.|last8=Chang|first8=Alexander R.|last9=Cheng|first9=Susan|last10=Delling|first10=Francesca N.|last11=Djousse|first11=Luc|last12=Elkind|first12=Mitchell S.V.|last13=Ferguson|first13=Jane F.|last14=Fornage|first14=Myriam|last15=Khan|first15=Sadiya S.|last16=Kissela|first16=Brett M.|last17=Knutson|first17=Kristen L.|last18=Kwan|first18=Tak W.|last19=Lackland|first19=Daniel T.|last20=Lewis|first20=Tené T.|last21=Lichtman|first21=Judith H.|last22=Longenecker|first22=Chris T.|last23=Loop|first23=Matthew Shane|last24=Lutsey|first24=Pamela L.|last25=Martin|first25=Seth S.|last26=Matsushita|first26=Kunihiro|last27=Moran|first27=Andrew E.|last28=Mussolino|first28=Michael E.|last29=Perak|first29=Amanda Marma|last30=Rosamond|first30=Wayne D.|last31=Roth|first31=Gregory A.|last32=Sampson|first32=Uchechukwu K.A.|last33=Satou|first33=Gary M.|last34=Schroeder|first34=Emily B.|last35=Shah|first35=Svati H.|last36=Shay|first36=Christina M.|last37=Spartano|first37=Nicole L.|last38=Stokes|first38=Andrew|last39=Tirschwell|first39=David L.|last40=VanWagner|first40=Lisa B.|last41=Tsao|first41=Connie W.|title=Heart Disease and Stroke Statistics—2020 Update: A Report From the American Heart Association|journal=Circulation|volume=141|issue=9|year=2020|issn=0009-7322|doi=10.1161/CIR.0000000000000757}}</ref>.Survival after out of hospital cardiac arrest and in hospital cardiac arrest has continued to improve over time according to the guideline.
== Diagnosis ==
===Diagnostic Criteria===
*The diagnosis of sudden cardiac arrest is made when  the following diagnostic criteria are met:
:*Absence of a [[palpable pulse]] of the [[heart]]<ref name="Harrison"> [http://books.mcgraw-hill.com/medical/harrisons/ Harrison's Principles of Internal Medicine] 16th Edition, The McGraw-Hill Companies, ISBN 0-07-140235-7</ref>
:*Absent [[carotid pulse]]
:*[[Gasping respiration]] or NO [[respiration]]
:*Loss of [[consciousness]] due to [[cerebral hypoperfusion]]
{| style="border: 2px solid #4479BA; align="left"
! style="width: 200px; background: #4479BA;" | {{fontcolor|#FFF|Components}}
! style="width: 300px; background: #4479BA;" | {{fontcolor|#FFF|Assessment and findings}}
|-
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | Symptoms
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" |
* Symptoms related to [[arrhythmia]]<ref name="ZimetbaumJosephson1998">{{cite journal|last1=Zimetbaum|first1=Peter|last2=Josephson|first2=Mark E.|title=Evaluation of Patients with Palpitations|journal=New England Journal of Medicine|volume=338|issue=19|year=1998|pages=1369–1373|issn=0028-4793|doi=10.1056/NEJM199805073381907}}</ref><ref name="NodaShimizu2005">{{cite journal|last1=Noda|first1=Takashi|last2=Shimizu|first2=Wataru|last3=Taguchi|first3=Atsushi|last4=Aiba|first4=Takeshi|last5=Satomi|first5=Kazuhiro|last6=Suyama|first6=Kazuhiro|last7=Kurita|first7=Takashi|last8=Aihara|first8=Naohiko|last9=Kamakura|first9=Shiro|title=Malignant Entity of Idiopathic Ventricular Fibrillation and Polymorphic Ventricular Tachycardia Initiated by Premature Extrasystoles Originating From the Right Ventricular Outflow Tract|journal=Journal of the American College of Cardiology|volume=46|issue=7|year=2005|pages=1288–1294|issn=07351097|doi=10.1016/j.jacc.2005.05.077}}</ref>
: [[Palpitations]], [[lightheadedness]], [[syncope]], [[dyspnea]], [[chest pain]], [[cardiac arrest]]
* Symptoms related to underlying [[heart disease]]: [[Dyspnea]] at rest or on exertion, [[orthopnea]], [[paroxysmal nocturnal dyspnea]], [[chest pain]], [[edema]]
* Precipitating factors: [[Exercise]], [[emotional stress]]
|-
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | Past medical history
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" |
* [[Heart disease]]: [[Coronary]], [[valvular]] ([[mitral valve prolapse]]), [[congenital heart disease]]
* [[Thyroid disease]]
* [[Acute kidney injury]]
* [[Chronic kidney disease]]
* [[Electrolyte abnormalities]]
* [[Stroke]],[[embolic events]]
* [[Lung disease]]
* [[Epilepsy]] ([[arrhythmic syncope]] can be misdiagnosed as [[epilepsy]])
* [[ Alcohol]], [[illicit drug]] use
* Use of over-the-counter medications caused [[QT prolongation]] and [[torsades de pointes]]
* [[ Unexplained motor vehicle accident]]
|-
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | Medications
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" |
* [[Antiarrhythmic]] medications
* Medication with  QT prolongation and torsades de pointes effect
* [[Cocaine]],[[amphetamines]]
* [[Anabolic steroids]]
* Medication-medication interaction that could cause [[QT prolongation]] and [[torsades de pointes]]
|-
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" | Family history
| style="padding: 0 5px; background: #F5F5F5; text-align: left;" |
* [[SCD]], [[SCA]], [[unexplained drowning]] in a first-degree relative
* [[SIDS]], repetitive spontaneous [[pregnancy losses]] concerning [[cardiac channelopathies]]
* [[IHD]]
* [[Cardiomyopathy]]: [[Hypertrophic]],[[ dilated]], [[ARVC]]
* [[Congenital heart disease]]
* [[ Cardiac channelopathies]]: [[Long QT]], [[Brugada]], [[Short QT]], [[CPVT]]
* [[Arrhythmias]]: [[conduction disorders]], [[ pacemakers]]/[[ICDs]]
* [[Neuromuscular disease]] associated with [[cardiomyopathies]]
* [[Muscular dystrophy]]
* [[Epilepsy]]
|-
|}
{{clear}}
=== Symptoms ===
*[[Symptoms]]  related to  arrhythmia or underlying [[ heart disease]] within one hour before [[ cardiac arrest]] may include the following:<ref name="pmid26720493">{{cite journal |vauthors=Marijon E, Uy-Evanado A, Dumas F, Karam N, Reinier K, Teodorescu C, Narayanan K, Gunson K, Jui J, Jouven X, Chugh SS |title=Warning Symptoms Are Associated With Survival From Sudden Cardiac Arrest |journal=Ann Intern Med |volume=164 |issue=1 |pages=23–9 |date=January 2016 |pmid=26720493 |pmc=5624713 |doi=10.7326/M14-2342 |url=}}</ref>
:* [[Palpitations]]
:* [[lightheadedness]]
:* [[syncope]]
:* [[dyspnea]]
:* [[chest pain]]
:* [[cardiac arrest]]
:* [[Dyspnea]] at rest or on exertion
:* [[orthopnea]]
:* [[paroxysmal nocturnal dyspnea]]
:* [[chest pain]], [[edema]]
=== Physical Examination ===
*Patients with [[cardiac arrest]] usually appear [[cyanotic]].
* [[Physical examination]] may be remarkable for:
:*[[Heart rate]] and [[regularity]], [[blood pressure]]
:*[[ Jugular venous pressure]]
:*[[Murmurs]]
:*[[ Pulses]], [[bruits]]
:*[[Edema]]
:*[[Sternotomy scars]]
=== Laboratory Findings ===
*An elevated concentration of  [[brain natriuretic peptide]] ([[BNP]]) predicts has been shown as the predictor of [[ventricular arrhythmia]] and [[sudden cardiac death]].<ref name="ScottBarry2009">{{cite journal|last1=Scott|first1=Paul A.|last2=Barry|first2=James|last3=Roberts|first3=Paul R.|last4=Morgan|first4=John M.|title=Brain natriuretic peptide for the prediction of sudden cardiac death and ventricular arrhythmias: a meta-analysis|journal=European Journal of Heart Failure|volume=11|issue=10|year=2009|pages=958–966|issn=13889842|doi=10.1093/eurjhf/hfp123}}</ref>
===Electrocardiogram===
An [[ECG]] may be helpful in the diagnosis of [[Sudden cardiac death]]. Findings on [[ECG]] associated with [[ sudden cardiac arrest]] include:<ref name="JayaramanReinier2018">{{cite journal|last1=Jayaraman|first1=Reshmy|last2=Reinier|first2=Kyndaron|last3=Nair|first3=Sandeep|last4=Aro|first4=Aapo L.|last5=Uy-Evanado|first5=Audrey|last6=Rusinaru|first6=Carmen|last7=Stecker|first7=Eric C.|last8=Gunson|first8=Karen|last9=Jui|first9=Jonathan|last10=Chugh|first10=Sumeet S.|title=Risk Factors of Sudden Cardiac Death in the Young|journal=Circulation|volume=137|issue=15|year=2018|pages=1561–1570|issn=0009-7322|doi=10.1161/CIRCULATIONAHA.117.031262}}</ref>
* [[Sinus tachycardia]] (39%)
* Abnormal [[T-wave inversions]] (30%)
* Prolonged [[QT]] interval (26%)
* Left/[[right atrial]] abnormality (22%)
* [[ LVH]] (17%)
* Abnormal frontal [[QRS axis]] (17%)
* Delayed [[QRS]]-transition zone in precordial leads (13%)
* Pathological [[Q waves]] (13%)
* [[intraventricular conduction delays]] (9%)
* Multiple [[premature ventricular contractions]] (9%)
* [[Normal ECG]] (9%)
==2017AHA/ACC/HRS Guideline for management of [[sudden cardiac arrest]] and [[ventricular arrhythmia]]==
{|class="wikitable"
|-
| colspan="1" style="text-align:center; background:LightGreen"|[[ACC AHA Guidelines Classification Scheme#Classification of Recommendations|Class I]] ''([[ACC AHA Guidelines Classification Scheme#Level of Evidence|Level of Evidence: B]])''
|-
| bgcolor="LightGreen"|
* Ambulatory [[ECG]] monitoring is recommended  in patients  with symptoms of [[syncope]], [[presyncope]], [[palpitation]] suspected [[ventricular arrhythmia]]
|}
{| class="wikitable" style="margin: 1em auto 1em auto"
! Class of recommendation || Level of evidence|| Recommendation for [[ECG]] and [[exercise tredmile test]]
|-
| 1|| B || In patients with [[wide complex tachycardia]] and [[hemodynamically stable]], 12 leads [[ECG]] should be obtained
|-
| 1 || B ||  [[Exercise stress test ]] should be obtained in patients suspected arrhythmia-related exercise such as [[ischemic heart disease]] or [[cathecolaminergic polymorphic ventricular tachycardia]]
|-
| 1 || B ||  In patients with documented [[ventricular arrhythmia]], 12 leads [[ECG]] should be obtained during sinus rhythm for evaluation of underlying [[heart disease]]
|}
===X-ray===
A  [[chest x-ray]] may be helpful in the diagnosis of the underlying cause of [[cardiac arrest]] such as [[cardiomegally]], [[ pulmonary congestion]],  massive [[pericardial effusion]], widening [[aorta]] silhouette.
===Echocardiography or Ultrasound===
[[Echocardiography]] may be helpful in the diagnosis the cause of [[lethal]] [[arrhythmia]] and [[sudden cardiac arrest]] by assessment of the following:<ref name="ParkerSalerno2018">{{cite journal|last1=Parker|first1=Brian K.|last2=Salerno|first2=Alexis|last3=Euerle|first3=Brian D.|title=The Use of Transesophageal Echocardiography During Cardiac Arrest Resuscitation: A Literature Review|journal=Journal of Ultrasound in Medicine|volume=38|issue=5|year=2018|pages=1141–1151|issn=0278-4297|doi=10.1002/jum.14794}}</ref>
* [[Regional wall motion abnormality]]
* [[Systolic function ]] of [[left ventricle]]
* Evidence of [[ myocardial infarction]]
* Valvular heart disease such as [[aortic stenosis]]
* [[Right ventricular cardiomyopathy]]
* [[Pericardial effusion]], [[ Tamponade]]
* [[ Aorta dissection]] 
==2017AHA/ACC/HRS Guideline for management of [[sudden cardiac arrest]] and [[ventricular arrhythmia]]==
{|class="wikitable"
|-
| colspan="1" style="text-align:center; background:Pink"|[[ACC AHA Guidelines Classification Scheme#Classification of Recommendations|Class I]] ''([[ACC AHA Guidelines Classification Scheme#Level of Evidence|Level of Evidence: B]])''
|-
| bgcolor="Pink"|
*[[ Echocardiography]] is recommended in patients with [[ventricular arrhythmia]] for evaluation of underlying [[structural heart disease]]
|}
===CT scan===
[[Cardiac CT scan]] may be helpful in the diagnosis of the causes of [[cardiac arrest]] by evaluation of the following:<ref>{{cite journal|doi=10.1016/2Fj.radcr.2019.03.007}}</ref>
* [[LV volumes]]
* [[Ejection fraction]]
* [[Cardiac mass]]
* Anomalous origin of [[coronary arteries]]
* [[Coronary arteries]] [[calcification]]
* [[Pulmonary embolism]]
* [[Aorta dissection]]
==2017AHA/ACC/HRS Guideline for management of [[sudden cardiac arrest]] and [[ventricular arrhythmia]]==
{|class="wikitable"
|-
| colspan="1" style="text-align:center; background:LightGreen"|[[ACC AHA Guidelines Classification Scheme#Classification of Recommendations|Class I]] ''([[ACC AHA Guidelines Classification Scheme#Level of Evidence|Level of Evidence: C]])''
|-
| bgcolor="LightGreen"|
* [[Coronary angiography]] or coronary [[CT]] angiography is recommended in patients recovered from unexplained [[cardiac arrest]] suspected [[ischemic heart disease]]
|}
===MRI===
[[Cardiac MRI]] is an accurate modality for diagnosis of structural and functional causes of [[cardiac arrest]] by the evaluation of the following:<ref name="ZarebaZareba2017">{{cite journal|last1=Zareba|first1=Wojciech|last2=Zareba|first2=Karolina M.|title=Cardiac Magnetic Resonance in Sudden Cardiac Arrest Survivors|journal=Circulation: Cardiovascular Imaging|volume=10|issue=12|year=2017|issn=1941-9651|doi=10.1161/CIRCIMAGING.117.007290}}</ref>
* [[Chamber volumes]]
* [[Left ventricular]] mass
* [[Left ventricular]] size, function
* [[ Right ventricular]] size and [[function]]
* [[Regional wall motion abnormality]]
==2017AHA/ACC/HRS Guideline for management of [[sudden cardiac arrest]] and [[ventricular arrhythmia]]==
{|class="wikitable"
|-
| colspan="1" style="text-align:center; background:PowderBlue"|[[ACC AHA Guidelines Classification Scheme#Classification of Recommendations|Class IIa]] ''([[ACC AHA Guidelines Classification Scheme#Level of Evidence|Level of Evidence: C]])''
|-
| bgcolor="PowderBlue"|
* [[Cardiac magnetic resonance imaging]] ([[CMR]]) or [[cardiac computer tomography]] is recommended in patients with [[ventricular arrhythmia]] for evaluation of [[structural heart disease]]
|}
===Other Imaging Findings===
There are no other imaging findings associated with [[sudden cardiac death]].
=== Other Diagnostic Studies ===
*In survivors of [[sudden cardiac death]] due to lethal [[arrhythmia]] from [[ischemic heart disease]], [[coronary angiography]] and probable [[revascularization]] is recommended.<ref name="LemkesJanssens2020">{{cite journal|last1=Lemkes|first1=Jorrit S.|last2=Janssens|first2=Gladys N.|last3=van der Hoeven|first3=Nina W.|last4=Jewbali|first4=Lucia S. D.|last5=Dubois|first5=Eric A.|last6=Meuwissen|first6=Martijn M.|last7=Rijpstra|first7=Topm A.|last8=Bosker|first8=Hans A.|last9=Blans|first9=Michiel J.|last10=Bleeker|first10=Gabe B.|last11=Baak|first11=Remon R.|last12=Vlachojannis|first12=George J.|last13=Eikemans|first13=Bob J. W.|last14=van der Harst|first14=Pim|last15=van der Horst|first15=Iwan C. C.|last16=Voskuil|first16=Michiel|last17=van der Heijden|first17=Joris J.|last18=Beishuizen|first18=Albertus|last19=Stoel|first19=Martin|last20=Camaro|first20=Cyril|last21=van der Hoeven|first21=Hans|last22=Henriques|first22=Jose P.|last23=Vlaar|first23=Alexander P. J.|last24=Vink|first24=Maarten A.|last25=van den Bogaard|first25=Bas|last26=Heestermans|first26=Ton A. C. M.|last27=de Ruijter|first27=Wouter|last28=Delnoij|first28=Thijs S. R.|last29=Crijns|first29=Harry J. G. M.|last30=Jessurun|first30=Gillian A. J.|last31=Oemrawsingh|first31=Pranobe V.|last32=Gosselink|first32=Marcel T. M.|last33=Plomp|first33=Koos|last34=Magro|first34=Michael|last35=Elbers|first35=Paul W. G.|last36=Spoormans|first36=Eva M.|last37=van de Ven|first37=Peter M.|last38=Oudemans-van Straaten|first38=Heleen M.|last39=van Royen|first39=Niels|title=Coronary Angiography After Cardiac Arrest Without ST Segment Elevation|journal=JAMA Cardiology|volume=5|issue=12|year=2020|pages=1358|issn=2380-6583|doi=10.1001/jamacardio.2020.3670}}</ref>
*[[Electrophysiology study]] is recommended for induction of [[bradyarrhythmia]] ,[[ventricular tachyarrhythmia]], determination the indication for [[ICD]] implantation  in [[dilated cardiomyopathy]],[[ARVC]], [[HCM]].
*[[Electrophysiology study]] is not recommended in [[long QT syndrome]] ([[LQTS]]), [[cathecolaminergic polymorphic ventricular tachycardia]] ([[CPVT]]), [[short QTsyndrome]] ([[SQTS]])..<ref name="Al-KhatibStevenson2018">{{cite journal|last1=Al-Khatib|first1=Sana M.|last2=Stevenson|first2=William G.|last3=Ackerman|first3=Michael J.|last4=Bryant|first4=William J.|last5=Callans|first5=David J.|last6=Curtis|first6=Anne B.|last7=Deal|first7=Barbara J.|last8=Dickfeld|first8=Timm|last9=Field|first9=Michael E.|last10=Fonarow|first10=Gregg C.|last11=Gillis|first11=Anne M.|last12=Granger|first12=Christopher B.|last13=Hammill|first13=Stephen C.|last14=Hlatky|first14=Mark A.|last15=Joglar|first15=José A.|last16=Kay|first16=G. Neal|last17=Matlock|first17=Daniel D.|last18=Myerburg|first18=Robert J.|last19=Page|first19=Richard L.|title=2017 AHA/ACC/HRS Guideline for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death|journal=Circulation|volume=138|issue=13|year=2018|issn=0009-7322|doi=10.1161/CIR.0000000000000549}}</ref>
==2017AHA/ACC/HRS Guideline for management of [[sudden cardiac arrest]] and [[ventricular arrhythmia]]==
{|class="wikitable"
|-
| colspan="1" style="text-align:center; background: Pink"|[[AHA guidelines classification scheme#Classification of Recommendations|Class I, Level of evidence:B]]
|-
|bgcolor="Pink"|In patients who recovered from [[SCA]] due to [[ventricular arrhythmia]] suspected [[ischemic heart disease]], [[coronary angiography]] and probabley revascularization is recommmended
|-
| colspan="1" style="text-align:center; background:Pink"|[[AHA guidelines classification scheme#Classification of Recommendations|Class I, Level of evidence:C]]
|-
|bgcolor="Pink"|In patients with anomalous origin of a [[coronary artery]] leading [[ventricular arrhythmia]] or [[SCA]], repair or revascularization is recommended
|-
|}
{|class="wikitable"
|-
| colspan="1" style="text-align:center; background:LemonChiffon"|[[AHA guidelines classification scheme#Classification of Recommendations|Class IIa, Level of evidence:B]]
|-
|bgcolor="LemonChiffon"|In patients with ischemic or [[nonischemic]] [[cardiomyopathy]] or [[congenital heart disease]] presented with [[syncope]] arrhythmia and do not meet criteria for  primary prevention ICD, an electrophysiological study is recommended for assessing the risk of sustained [[VT]]
|-
| colspan="1" style="text-align:center; background:LemonChiffon"|[[AHA guidelines classification scheme#Classification of Recommendations|Class III, Level of evidence:B]]
|-
|bgcolor="LemonChiffon"|In patients who meet criteria for [[ICD]] implantation, an [[electrophysiological study]] is not recommended for only inducing [[ventricular arrhythmia]]
|-
| colspan="1" style="text-align:center; background:LemonChiffon"|[[AHA guidelines classification scheme#Classification of Recommendations|Class III, Level of evidence:B]]
|-
|bgcolor="LemonChiffon"| An electrophysiological study is not recommended for risk stratification  for [[ventricular arrhythmia]] in patients with [[Long QT syndrome]], [[short QT syndrome]], [[cathecolaminergic polymorphic  ventricular arrhythmia]]
|-
|}
{|class="wikitable"
|-
| colspan="1" style="text-align:center; background:PapayaWhip"|[[ACC AHA Guidelines Classification Scheme#Classification of Recommendations|Class I]] ''([[ACC AHA Guidelines Classification Scheme#Level of Evidence|Level of Evidence: C]])''
|-
| bgcolor="PapayaWhip"|
* In patients with [[SCA]] or [[SCD]] in their family member, genetic tests and genetic counselling is recommended
|}
== Treatment ==
=== Medical Therapy ===
* The mainstay of therapy for patients with [[cardiac arrest]]  is starting [[cardiopulmonary resuscitation]] with minimizing interruption in [[chest compression]].<ref name="PrioriBlomström-Lundqvist2015">{{cite journal|last1=Priori|first1=Silvia G.|last2=Blomström-Lundqvist|first2=Carina|last3=Mazzanti|first3=Andrea|last4=Blom|first4=Nico|last5=Borggrefe|first5=Martin|last6=Camm|first6=John|last7=Elliott|first7=Perry Mark|last8=Fitzsimons|first8=Donna|last9=Hatala|first9=Robert|last10=Hindricks|first10=Gerhard|last11=Kirchhof|first11=Paulus|last12=Kjeldsen|first12=Keld|last13=Kuck|first13=Karl-Heinz|last14=Hernandez-Madrid|first14=Antonio|last15=Nikolaou|first15=Nikolaos|last16=Norekvål|first16=Tone M.|last17=Spaulding|first17=Christian|last18=Van Veldhuisen|first18=Dirk J.|title=2015 ESC Guidelines for the management of patients with ventricular arrhythmias and the prevention of sudden cardiac death|journal=European Heart Journal|volume=36|issue=41|year=2015|pages=2793–2867|issn=0195-668X|doi=10.1093/eurheartj/ehv316}}</ref><ref name="Al-KhatibStevenson2018">{{cite journal|last1=Al-Khatib|first1=Sana M.|last2=Stevenson|first2=William G.|last3=Ackerman|first3=Michael J.|last4=Bryant|first4=William J.|last5=Callans|first5=David J.|last6=Curtis|first6=Anne B.|last7=Deal|first7=Barbara J.|last8=Dickfeld|first8=Timm|last9=Field|first9=Michael E.|last10=Fonarow|first10=Gregg C.|last11=Gillis|first11=Anne M.|last12=Granger|first12=Christopher B.|last13=Hammill|first13=Stephen C.|last14=Hlatky|first14=Mark A.|last15=Joglar|first15=José A.|last16=Kay|first16=G. Neal|last17=Matlock|first17=Daniel D.|last18=Myerburg|first18=Robert J.|last19=Page|first19=Richard L.|title=2017 AHA/ACC/HRS Guideline for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death|journal=Circulation|volume=138|issue=13|year=2018|issn=0009-7322|doi=10.1161/CIR.0000000000000549}}</ref>
* The rhythm should be reassessed. If the rhythm is [[VF]] or[[pulseless VT]], the shock should be delivered immediately.
* If the [[rhythm]] is [[asystole]] or [[pulseless electrical activity]] ([[PEA]]), [[CPR]] should be resumed.
* [[Advanced life support]] ([[ALS]]) should be kept with minimizing interruption in [[chest compression]] including:
:* [[advanced airway]]
:* Continuous [[chest compressions]]
:* after placing an advanced [[airway]]
:* [[capnography]]
:* IV/IO access
:* [[vasopressors]], [[antiarrhythmics]] therapy
:* Correcting  reversible causes including [[hypoxia]], [[hypovolemia]],[[hypothermia]], [[hyperkalemia]], [[hypokalemia]],[[acidosis]], [[tension pneumothorax]], [[tamponade]], toxins ([[benzodiazepines]], [[alcohol]], [[opiates]], [[tricyclics]], [[barbiturates]], [[betablocker]]s, [[calcium channel blocker]]s) 
* The followings should be considered immediately in [[post cardiac arrest]] patients:
:* 12–lead [[ECG]]
:* [[Perfusion]]/[[reperfusion]] in patients with acute [[myocardial infarction]]
:* [[Oxygenation]] and [[ventilation]]
:* Temperature control
:* Treatment of  reversible causes
:*Management  of patients in  post-cardiac arrest status include:
*Treatment of the underlying disorder
* Hemodynamic stability
*Respiratory support
*Controlling the [[neurologic]] complications
==2017AHA/ACC/HRS Guideline for management of [[sudden cardiac arrest]] and [[ventricular arrhythmia]]==
{| style="cellpadding=0; cellspacing= 0; width: 600px;"
|-
| style="padding: 0 5px; font-size: 100%; background: #4682B4; color: #FFFFFF;" align=center |'''Recommendations for management of cardiac arrest'''
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left | '''CPR ([[ACC AHA guidelines classification scheme|Class I, Level of Evidence A]]):'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ [[CPR]] should be done according to basic and advanced cardiovascular life support algorithms <br>
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |'''[[Amiodarone]] ([[ACC AHA guidelines classification scheme|Class I, Level of Evidence A]]) :'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ In the recurrence of [[ventricular arrhythmia]] after maximum energy shock delivery and unstable hemodynamic, [[amiodarone]] should de infused<br>
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |'''[[Direct current cardioversion]] : ([[ACC AHA guidelines classification scheme|Class I, Level of Evidence A]])'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ In ventricular arrhythmia and unstable hemodynamic, direct current cardioversion should be delivered
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |'''[[Revascularization]]:([[ACC AHA guidelines classification scheme|Class I, Level of Evidence B]])'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ In patients with [[polymorphic VT]] and [[VF]] and evidence of acute [[STEMI]] in [[ECG]], coronary angiography and emergency revascularization is advised
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |'''[[ Wide QRS tachycardia]]: ([[ACC AHA guidelines classification scheme|Class I, Level of Evidence C]])'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ [[Wide QRS tachycardia]] should be considered as [[VT]] if the diagnosis is unclear
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left | '''Intravenous [[procainamide]] ([[ACC AHA guidelines classification scheme|Class 2a, Level of Evidence A]]):'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ In hemodynamically stable [[VT]], intravenous [[procainamide]] is recommended
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |'''Intravenous [[lidocaine]] : ([[ACC AHA guidelines classification scheme|Class 2a, Level of Evidence B]])'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ [[Lidocaine ]] is recommended in witness [[cardiac arrest]] due to polymorphic [[VT]], [[VF]] unresponsed to [[CPR]], [[defibrillation]] or [[ vasopressor therapy]]
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |'''Intravenous [[betablocker]] : ([[ACC AHA guidelines classification scheme|Class 2a, Level of Evidence B]])'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ In polymorphic [[VT]] due to [[myocardial ischemia]], intravenous [[betablocker]] maybe helpful
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |'''Intravenous [[Epinephrine]] : ([[ACC AHA guidelines classification scheme|Class 2b, Level of Evidence A]])'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ In [[cardiac arrest]] administration of 1 mg [[epinephrine]] every 3-5 minutes during [[CPR]] is recommended
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |'''Intravenous [[amiodarone]] : ([[ACC AHA guidelines classification scheme|Class 2b, Level of Evidence B]])'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ In hemodynamic stable [[VT]], infusion [[amiodarone]] or [[sotalole]] maybe considered
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |''' High dose of intravenous [[epinephrine]] : ([[ACC AHA guidelines classification scheme|Class III , Level of Evidence A]])'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ In [[cardiac arrest]], administration of high dose epinephrine>1 mg bolouses is not beneficial<br>
❑ In refractory [[VF]] not related to [[torsades de pointes]], administration of intravenous [[magnesium]] is not beneficial<br>
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |'''Intravenous [[amiodarone]] : ([[ACC AHA guidelines classification scheme|Class III , Level of Evidence B]])'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑In acute [[myocardial infarction]], prophylactic administration of [[lidocaine]] or [[amiodarone]] for prevention of [[VT]] is harmful
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |'''Intravenous [[verapamil]], [[diltiazem]] : ([[ACC AHA guidelines classification scheme|Class III , Level of Evidence C]])'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ In a wide [[QRS]] tachycardia with unknown origin, administration of [[verapamil]] and [[diltiazem]] is harmful
|}
{{familytree/start| | | | | | | | | | | | | |}}
{{familytree| | | | | | | | | | | A01 | | A01=Sustained monomorphic [[VT]]}}
{{familytree| | | | | | | | | | | |!| | | | | | | | }}
{{familytree| | | | | | | | | | | B01 | | | | | |B01=Hemodynamic stability}}
{{familytree| | | | |,|-|-|-|-|-|-|^|-|-|-|-|-|-|.| }}
{{familytree| | | | C01 | | | | | | | | | | | |C02|C01=Stable|C02=Unstable}}
{{familytree| | | | |!| | | | | | | | | | | | | |!| }}
{{familytree| | | | D01 | | | | | | | | | | | |D02|D01=12-Lead [[ECG]], [[history]], [[physical exam]]|D02=[[Dirrect current cardioversion]],[[ACLS]]}}
{{familytree| | | | |!| | | | | | | | | | | | | | | | | | | |}}
{{familytree| | | | E01 |,|-|E00|-|-|-|-|-|-|-|F02| | | | | | E01=Notifying disease causing [[VT]]|E00= Cardioversion(class1) |F02= [[VT]] termination}}
{{familytree| | | | |!| |!| |!| | | | | | | |,|-|^|-|.| | | | | }}
{{familytree| | | | F01 |+|-|F00| | | | | |S02| |  S03| | |F01=[[Structural heart disease]]|F00=Intravenous [[ procainamide]] (class2a)|S02=Yes, therapy of underlying heart disease|S03=NO, [[cardioversion]] (class1)}}
{{familytree| | | | |!| |!| |!| | | | | | | | | | | |!| | | | |}}
{{familytree| | | | L01 |`|-|L00| | | | | | | | | P01 | | | | | L00= Intravenous [[amiodarone]] or [[sotalole]] (class2b)|L01= NO, [[Ideopathic VT]]|P01=[[VT]] termination}}
{{familytree| | | | |!| | | | | | | | | | | | | | |!| | | | | |}}
{{familytree| | | | S01 | | | | | | | | | | | | | |!| | | | | |S01=[[Verapamil]] sensitive [[VT]]: [[Verapamil]]  outflow tract [[VT]]: [[betablocker]] (class2a) |}}
{{familytree| | |,|-|^|-|.| | | | | | | | | | |,|-|^|-|.| | | |}}
{{familytree| | |N01| |N02| | | | | | | | |  Q01| |  Q02| | | | | N01= Effective| N02=Non effective: [[cardioversion]]|Q01= Yes,therapy of underlying heart disease|Q02=NO, [[Sedation]] ,[[anesthesia]], reassess antiarrhythmic therapy, repeating [[cardioversion]]}}
{{familytree| | |!| | | | | | | | | | | | | | | | | | |!| | | |}}
{{familytree| | |M01| | | | | | | | | | | | | | | | |  R01| | | |M01= Therapy to prevent recurrence of [[VT]] |R01= No [[VT]] termination}}
{{familytree|,|-|^|-|.| | | | | | | | | | | | | | | | |!| | | |}}
{{familytree|!| | | |!| | | | | | | | | | | | | | | | |R02| | |R02= [[Catheter ablation]] (class1) |}}
{{familytree|G01| |G02| | | | | | | | | | | | | | | | | | | | | G01=Catheter ablation (class1)| G02= [[ Verapamil]] , [[betablocker]] (class2a)}}
{{familytree| | | | | | | | | | | | | | | | | | | | | | | | | |}}
{{familytree/end}}
=== Intervention ===
[[Catheter ablation]] can only be performed for patients with sustained monomorphic [[ventricular tachycardia]] based on these characteristics:
*Incessant [[VT]] or electrical storm due to myocardial scar tissue
* Sustained [[VT]] and recurrent [[ICD]] shock in [[ischemic heart disease]]
=== Prevention ===
*Effective measures for the [[primary prevention]] of [[sudden cardiac death]] in individuals who are at risk of [[SCD]] but have not yet experienced an aborted [[cardiac arrest]] or [[life-threatening arrhythmias]] include [[ICD]] implantation based on the guideline.<ref name="Al-KhatibStevenson2018">{{cite journal|last1=Al-Khatib|first1=Sana M.|last2=Stevenson|first2=William G.|last3=Ackerman|first3=Michael J.|last4=Bryant|first4=William J.|last5=Callans|first5=David J.|last6=Curtis|first6=Anne B.|last7=Deal|first7=Barbara J.|last8=Dickfeld|first8=Timm|last9=Field|first9=Michael E.|last10=Fonarow|first10=Gregg C.|last11=Gillis|first11=Anne M.|last12=Granger|first12=Christopher B.|last13=Hammill|first13=Stephen C.|last14=Hlatky|first14=Mark A.|last15=Joglar|first15=José A.|last16=Kay|first16=G. Neal|last17=Matlock|first17=Daniel D.|last18=Myerburg|first18=Robert J.|last19=Page|first19=Richard L.|title=2017 AHA/ACC/HRS Guideline for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death|journal=Circulation|volume=138|issue=13|year=2018|issn=0009-7322|doi=10.1161/CIR.0000000000000549}}</ref>
*[[Secondary prevention]] strategy following aborted sudden cardiac death include [[revascularization]], [[ICD]] implantation.
==2017AHA/ACC/HRS Guideline for management of [[sudden cardiac arrest]] and [[ventricular arrhythmia]]==
<span style="font-size:85%">'''Abbreviations:'''
'''MI:''' [[Myocardial infarction]];
'''VT:''' [[Ventricular tachycardia]];
'''VF:''' [[Ventricular fibrillation]];
'''LVEF:''' [[Left ventricular ejection fraction]];
'''ICD:''' [[Intracardiac defibrillation]];
'''NYHA:''' [[New York Heart Association]] functional classification;
'''LVAD:''' [[Left ventricular assist device]];
'''EPS:''' [[Electrophysiology study]]
</span>
<br>
{| style="cellpadding=0; cellspacing= 0; width: 600px;"
|-
| style="padding: 0 5px; font-size: 100%; background: #4682B4; color: #FFFFFF;" align=center |'''Recommendations for primary prevention of sudden cardiac death in ischemic heart disease'''
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left | '''[[ICD]] implantation  ([[ACC AHA guidelines classification scheme|Class I, Level of Evidence A]]):'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ In patients with [[LVEF]]≤ 35%  and [[NYHA]]  class 2,3 [[heart failure]] despite medical therapy, at least 40 days post [[MI]] or 90 days post [[revascularization]] with life expectancy > 1 year <br
❑ In patients with [[LVEF]]≤ 30% and [[NYHA]] class 1 [[heart failure]] despite medical therapy at least 40 days post [[MI]] or 90 days [[postrevascularization]] with life expectancy > 1 year
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |'''[[ICD]] implantation ([[ACC AHA guidelines classification scheme|Class I, Level of Evidence B]]) :'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ In patients with [[LVEF]] ≤ 40% and nonsustained [[VT]] due to prior [[MI]] or [[VT]] ,[[VF]] inducible in [[EPS]] with life expectancy >1 year<br>
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |'''[[ICD implantation]] : ([[ACC AHA guidelines classification scheme|Class IIa, Level of Evidence B]])'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ In patients with [[NYHA]] class 4 who are candidates for cardiac transplantation or [[LVAD]] with life expectancy > 1 year
|-
|style="font-size: 100; padding: 0 5px; background: #B8B8B8" align=left |'''([[ACC AHA guidelines classification scheme|Class III, Level of Evidence C]])'''
|-
|style="padding: 0 5px; font-size: 100%; background: #F5F5F5; width: 70%" align=left|
❑ [[ICD ]] is not beneficial in patients with [[NYHA]] class 4 despite optimal medical therapy who are not candidates for [[cardiac transplantation]] or [[LVAD]]
|-
|}
<span style="font-size:85%">'''Abbreviations:'''
'''IHD:''' [[Ischemic heart disease]];
'''VT:''' [[Ventricular tachycardia]];
'''SCD:''' [[Sudden cardiac death]];
'''SCA:''' [[Sudden cardiac arrest]];
'''ICD:''' [[Intracardiac defibrillation]];
'''EPS:''' [[Electrophysiologic study]]
</span>
<br>
{{Family tree/start}}
{{Family tree | | | | | | | A01 | | | | A01=Secondary prevention in patients with [[IHD]]}}
{{Family tree | | | | |,|-|-|^|-|-|.| | }}
{{Family tree | | | | B01 | | | | B02 | | |B01=[[SCA]] survivor or sustained monomorph [[VT]]|B02=Cardiac [[syncope]]}}
{{Family tree | | | | |!| | | | | |!| | | | | | | | |}}
{{Family tree | | | | C01 | | | | C02 |-|-|-|.| | | | | |C01=[[Ischemia]]|C02=LVEF≤35%}}
{{Family tree | | |,|-|^|-|.| | | | | | | | |!| | | |}}
{{Family tree | | |D01| |D02| | | | | | | | |!| | | | | |D01=Yes: [[revascularization]], reassessment about [[SCD]] risk (class1)|D02=NO:[[ICD]] candidate}}
{{Family tree | | | | |,|-|^|-|.| | | | |,|-|^|-|.| |}}
{{Family tree | | | | |E01| |E02| | | D03 | | D04 | | | | E01=Yes:[[ICD]] (class1)|E02=NO: medical therapy (class1)|D03= Yes:[[ICD]] (CLASS1)| D04=NO:[[EP study]] (class 2a)}}
{{Family tree | | | | | | | | | | | | | | | | | |!| |}}
{{Family tree | | | | | | | | | | | | | | | | | E03 | |E03=[[Ventriculat arrhythmia]] induction}}
{{Family tree | | | | | | | | | | | | | | | |,|-|^|-|.| |}}
{{Family tree | | | | | | | | | | | | | | | |F01| |F02| |F01=Yes: [[ICD]] (class1)|F02=NO: monitoring }}
{{Family tree | | | | | | | | | | | | | | | | | | | |}}
{{Family tree | | | | | | | | | | | | | | | | | | | |}}
{{Family tree | | | | | | | | | | | | | | | | | | | |}}
{{Family tree | | | | | | | | | | | | | | | | | | | |}}
{{Family tree | | | | | | | | | | | | | | | | | | | |}}
{{Family tree | | | | | | | | | | | | | | | | | | | |}}
{{Family tree/end}}
==References==
{{Reflist|2}}
[[Category:Pick One of 28 Approved]]
{{WS}}
{{WH}}
==Overview==
The term '''sudden cardiac death''' refers to [[natural death]] from cardiac causes, heralded by abrupt loss of [[consciousness]] within one hour of the onset of acute symptoms.<ref>Myerburg, Robert J. "Cardiac Arrest and Sudden Cardiac Death" in ''Heart Disease: A Textbook of Cardiovascular Medicine,'' 7th edition.  Philadelphia: WB Saunders, 2005.</ref>  Other forms of sudden death may be noncardiac in origin and are therefore termed sudden death rather than sudden cardiac death.  Examples of this include respiratory arrest (such as due to airway obstruction, which may be seen in cases of [[choking]] or [[asphyxiation]]), toxicity or poisoning, [[anaphylaxis]], or trauma.<ref>[http://poptop.hypermart.net/sudden.html Sudden Unexpected Death: Causes and Contributing Factors] on poptop.hypermart.net.</ref>
It is important to make a distinction between this term and the related term '''[[cardiac arrest]]''', which refers to cessation of cardiac pump function which may be reversible (i.e., may not be fatal).  The phrase '''Sudden Cardiac Death''' is a [[public health]] concept incorporating the features of ''natural'', ''rapid'', and ''unexpected''.  It does not specifically refer to the mechanism or cause of death.  Although the most frequent underlying cause of Sudden Cardiac Death is [[Coronary Artery Disease]], other categories of causes are listed below.
==Cardiac Arrest as a Subtype of Sudden Death==
A '''cardiac arrest''', also known as '''cardiorespiratory arrest''', '''cardiopulmonary arrest''' or '''circulatory arrest''', is the abrupt cessation of normal circulation of the [[blood]] due to failure of the [[heart]] to contract effectively during [[Systole (medicine)|systole]].<ref name="Harrison"> [http://books.mcgraw-hill.com/medical/harrisons/ Harrison's Principles of Internal Medicine] 16th Edition, The McGraw-Hill Companies, ISBN 0-07-140235-7</ref>
"Arrested" blood circulation prevents delivery of [[oxygen]] to ''all'' parts of the body. Cerebral [[hypoxia (medical)|hypoxia]], or lack of oxygen supply to the brain, causes victims to [[unconsciousness|lose consciousness]] and to [[respiratory arrest|stop normal breathing]]. Brain injury is likely if cardiac arrest is untreated for more than 5 minutes,<ref name="pmid3536160">{{cite journal |author=Safar P |title=Cerebral resuscitation after cardiac arrest: a review |journal=Circulation |volume=74 |issue=6 Pt 2 |pages=IV138–53 |year=1986 |month=December |pmid=3536160 |doi= |url=}}</ref> To improve survival and neurological recovery immediate response is paramount.<ref name="IrwinRippe"> [http://www.lww.com/product/?0-7817-3548-3 Irwin and Rippe's Intensive Care Medicine] by Irwin and Rippe, Fifth Edition (2003), Lippincott Williams & Wilkins, ISBN 0-7817-3548-3</ref>
Cardiac arrest is a [[medical emergency]] that, in certain groups of [[patient]]s, is potentially reversible if treated early enough (See Reversible Causes, below). When unexpected cardiac arrest leads to death this is called '''[[sudden cardiac death]]''' (SCD)<ref name="Harrison"> [http://books.mcgraw-hill.com/medical/harrisons/ Harrison's Principles of Internal Medicine] 16th Edition, The McGraw-Hill Companies, ISBN 0-07-140235-7</ref>. The primary first-aid treatment for cardiac arrest is ''[[cardiopulmonary resuscitation]]'' (commonly known as '''CPR''') to provide circulatory support until availability of definitive medical treatment, which will vary dependant on the rhythm the heart is exhibiting, but often requires [[defibrillation]].
==FDA Guidance re Classification and Types of Cardiovascular and Non-Cardiovascular Death==
===Definition of Cardiovascular Death <ref>FDA guinace issued October 20, 2010</ref>===
<blockquote>
The determination of the specific cause of cardiovascular death is complicated by the fact that we are particularly interested in one underlying cause of death (acute myocardial infarction (AMI)) and several modes of death (arrhythmia and heart failure/low output). It is noted that heart attack-related deaths are manifested as sudden death or heart failure, so these events need to be carefully defined.
Cardiovascular death includes death resulting from an acute myocardial infarction, sudden cardiac death, death due to heart failure, death due to stroke, and death due to other cardiovascular causes, as follows:
====1.Death due to Acute Myocardial Infarction ====
This refers to a death by any mechanism (arrhythmia, heart failure, low output) within 30 days after a myocardial infarction (MI) related to the immediate consequences of the myocardial infarction, such as progressive congestive heart failure (CHF), inadequate cardiac output, or recalcitrant arrhythmia. If these events occur after a “break” (e.g., a CHF and arrhythmia free period of at least a week), they should be designated by the immediate cause, even though the MI may have increased the risk of that event (e.g., late arrhythmic death becomes more likely after an acute myocardial infarction (AMI)). The acute myocardial infarction should be verified to the extent possible by the diagnostic criteria outlined for acute myocardial infarction or by autopsy findings showing recent myocardial infarction or recent coronary thrombus. Sudden cardiac death, if accompanied by symptoms suggestive of myocardial ischemia, new ST elevation, new LBBB, or evidence of fresh thrombus by coronary angiography and/or at autopsy should be considered death resulting from an acute myocardial infarction, even if death occurs before blood samples or 12-lead electrocardiogram (ECG) could be obtained, or at a time before the appearance of cardiac biomarkers in the blood.
Death resulting from a procedure to treat a myocardial infarction (percutaneous coronary intervention (PCI), coronary artery bypass graft surgery (CABG), or to treat a complication resulting from myocardial infarction, should also be considered death due to acute MI.
Death resulting from a procedure to treat myocardial ischemia (angina) or death due to a myocardial infarction that occurs as a direct consequence of a cardiovascular investigation/procedure/operation should be considered as a death due to other cardiovascular causes.
====2.Sudden Cardiac Death====
This refers to a death that occurs unexpectedly, not following an acute AMI, and includes the following deaths:
:a. Death witnessed and instantaneous without new or worsening symptoms
:b. Death witnessed within 60 minutes of the onset of new or worsening cardiac symptoms, unless the symptoms suggest AMI
:c. Death witnessed and attributed to an identified arrhythmia (e.g., captured on an electrocardiographic (ECG) recording, witnessed on a monitor, or unwitnessed but found on implantable cardioverter-defibrillator review)
:d. Death after unsuccessful resuscitation from cardiac arrest
:e. Death after successful resuscitation from cardiac arrest and without identification of a non-cardiac etiology (Post-Cardiac Arrest Syndrome)
:f. Unwitnessed death without other cause of death (information regarding the patient’s clinical status preceding death should be provided, if available)
=====General Considerations=====
*A subject seen alive and clinically stable 12-24 hours prior to being found dead without any evidence or information of a specific cause of death should be classified as :sudden cardiac death.”. Typical scenarios include
:* Subject well the previous day but found dead in bed the next day
:* Subject found dead at home on the couch with the television on
* Deaths for which there is no information beyond “Patient found dead at home” may be classified as “death due to other cardiovascular causes” or in some trials, “undetermined cause of death.” Please see Definition of Undetermined Cause of Death, below, for full details.
====3. Death due to Heart Failure or Cardiogenic Shock ====
This refers to a death occurring in the context of clinically worsening symptoms and/or signs of heart failure (see Chapter 7) without evidence of another cause of death and not following an AMI. Note that deaths due to heart failure can have various etiologies, including one or more AMIs (late effect), ischemic or non-ischemic cardiomyopathy, or valve disease.
Death due to Heart Failure or Cardiogenic shock should include sudden death occurring during an admission for worsening heart failure as well as death from progressive heart failure or cardiogenic shock following implantation of a mechanical assist device.
New or worsening signs and/or symptoms of congestive heart failure (CHF) include any of the following:
:a. New or increasing symptoms and/or signs of heart failure requiring the initiation of, or an increase in, treatment directed at heart failure or occurring in a patient already receiving maximal therapy for heart failure
:b. Heart failure symptoms or signs requiring continuous intravenous therapy or chronic oxygen administration for hypoxia due to pulmonary edema
:c. Confinement to bed predominantly due to heart failure symptoms
:d. Pulmonary edema sufficient to cause tachypnea and distress not occurring in the context of an acute myocardial infarction, worsening renal function, or as the consequence of an arrhythmia occurring in the absence of worsening heart failure
: e. Cardiogenic shock not occurring in the context of an acute myocardial infarction or as the consequence of an arrhythmia occurring in the absence of worsening heart failure
Cardiogenic shock is defined as systolic blood pressure (SBP) < 90 mm Hg for greater than 1 hour, not responsive to fluid resuscitation and/or heart rate correction, and felt to be secondary to cardiac dysfunction and associated with at least one of the following signs of hypoperfusion:
:* Cool, clammy skin or
:* Oliguria (urine output < 30 mL/hour) or
:* Altered sensorium or
:* Cardiac index < 2.2 L/min/m2
Cardiogenic shock can also be defined if SBP < 90 mm Hg and increases to ≥ 90 mm Hg in less than 1 hour with positive inotropic or vasopressor agents alone and/or with mechanical support.
=====General Considerations=====
Heart failure may have a number of underlying causes, including acute or chronic ischemia, structural heart disease (e.g. hypertrophic cardiomyopathy), and valvular heart disease. Where treatments are likely to have specific effects, and it is likely to be possible to distinguish between the various causes, then it may be reasonable to separate out the relevant treatment effects. For example, obesity drugs such as fenfluramine (pondimin) and dexfenfluramine (redux) were found to be associated with the development of valvular heart disease and pulmonary hypertension. In other cases, the aggregation implied by the definition above may be more appropriate.
====4.Death due to Stroke====
This refers to death occurring up to 30 days after a stroke that is either due to the stroke or caused by a complication of the stroke.
====5.Death due to Other Cardiovascular Causes====
This refers to a cardiovascular death not included in the above categories (e.g. dysrhythmia unrelated to sudden cardiac death, pulmonary embolism, cardiovascular intervention (other than one related to an AMI), aortic aneurysm rupture, or peripheral arterial disease). Mortal complications of cardiac surgery or non-surgical revascularization should be classified as cardiovascular deaths.
===Definition of Non-Cardiovascular Death===
Non-cardiovascular death is defined as any death that is not thought to be due to a cardiovascular cause. Detailed recommendations on the classification of non-cardiovascular causes of death are beyond the scope of this document. The level of detail required and the optimum classification will depend on the nature of the study population and the anticipated number and type of non-cardiovascular deaths. Any specific anticipated safety concern should be included as a separate cause of death. The following is a suggested list of non-cardiovascular* causes of death:
====Non-Malignant Causes====
:*Pulmonary
:*Renal
:*Gastrointestinal
:*Hepatobiliary
:*Pancreatic
:*Infection (includes sepsis)
:*Non-infectious (e.g., systemic inflammatory response syndrome (SIRS))
:*Hemorrhage, not intracranial
:*Non-cardiovascular system organ failure (e.g., hepatic failure)
:*Non-cardiovascular surgery
:*Other non-cardiovascular, specify: ________________
:*Accidental/Trauma
:*Suicide
:*Drug Overdose
:*Death due to a gastrointestinal bleed should not be considered a cardiovascular death.
====Malignant Causes====
Malignancy should be coded as the cause of death if:
:*Death results directly from the cancer; or
:*Death results from a complication of the cancer (e.g. infection, complication of surgery / chemotherapy / radiotherapy); or
:*Death results from withdrawal of other therapies because of concerns relating to the poor prognosis associated with the cancer
Cancer deaths may arise from cancers that were present prior to randomization or which developed subsequently. It may be helpful to distinguish these two scenarios (i.e. worsening of prior malignancy; new malignancy).
Suggested categorization includes common organ systems, hematologic, or unknown.
===Definition of Undetermined Cause of Death===
Undetermined Cause of Death refers to a death not attributable to one of the above categories of cardiovascular death or to a non-cardiovascular cause. Inability to classify the cause of death may be due to lack of information (e.g., the only available information is “patient died”) or when there is insufficient supporting information or detail to assign the cause of death. In general, the use of this category of death should be discouraged and should apply to a minimal number of patients in well-run clinical trials.
A common analytic approach for cause of death analyses is to assume that all undetermined cases are included in the cardiovascular category (e.g., presumed cardiovascular death, specifically “death due to other cardiovascular causes”). Nevertheless, the appropriate classification and analysis of undetermined causes of death depends on the population, the intervention under investigation, and the disease process. The approach should be prespecified and described in the protocol and other trial documentation such as the endpoint adjudication procedures and/or the statistical analysis plan.
</blockquote>


==References==
==References==

Revision as of 11:49, 3 February 2021

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Sara Zand, M.D.[2]

Overview

Sudden cardiac death is a natural, rapid, unexpected death secondary to cardiac cause or mechanism. Sudden cardiac arrest is defined as the unexpected cessation of pumping blood into vital organs due to electrical disturbance in the pathway of SA node, AV node, Hiss Purkinje fibers or pumping failure due to conditions such as cardiogenic shock, massive pulmonary thromboembolism,fulminant myocarditis, ruptured left ventricular free wall. Without any intervention for immediate restoration of the circulation, biologic death or sudden cardiac death will happen minutes to weeks after cardiac arrest. Sudden cardiac death is responsible for 50% of cardiac death annually in the united state. In-hospital cardiac arrest happens in 290,000 adults annually in the united states. The most common cause of sudden cardiac death is coronary artery disease and atherosclerosis process. The presence of underlying disorders such as malignancy or liver disease at the time of cardiac arrest makes the condition worst. Patients with acute myocardial infarction and in-hospital cardiac arrest with shockable rhythm have a better prognosis. Post cardiopulmonary resuscitation state management should be focused on neurologic complications, hemodynamic stability, and respiratory support.


References

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