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==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]].


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Revision as of 02:07, 5 February 2011

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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.[1] 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.[2]

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.[3]

"Arrested" blood circulation prevents delivery of oxygen to all parts of the body. Cerebral hypoxia, or lack of oxygen supply to the brain, causes victims to lose consciousness and to stop normal breathing. Brain injury is likely if cardiac arrest is untreated for more than 5 minutes,[4] To improve survival and neurological recovery immediate response is paramount.[5]

Cardiac arrest is a medical emergency that, in certain groups of patients, 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)[3]. 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. Template:WH Template:WS

  1. Myerburg, Robert J. "Cardiac Arrest and Sudden Cardiac Death" in Heart Disease: A Textbook of Cardiovascular Medicine, 7th edition. Philadelphia: WB Saunders, 2005.
  2. Sudden Unexpected Death: Causes and Contributing Factors on poptop.hypermart.net.
  3. 3.0 3.1 Harrison's Principles of Internal Medicine 16th Edition, The McGraw-Hill Companies, ISBN 0-07-140235-7
  4. Safar P (1986). "Cerebral resuscitation after cardiac arrest: a review". Circulation. 74 (6 Pt 2): IV138–53. PMID 3536160. Unknown parameter |month= ignored (help)
  5. Irwin and Rippe's Intensive Care Medicine by Irwin and Rippe, Fifth Edition (2003), Lippincott Williams & Wilkins, ISBN 0-7817-3548-3