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Revision as of 01:20, 5 August 2013

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

A wide complex tachycardia is either of ventricular origin (ventricular tachycardia or VT), of supraventricular origin with aberrant conduction (SVT with aberrancy), of supraventricular origin and is conducted down a bypass tract such as in Wolff-Parkinson-White syndrome (WPW), or is due to a pacemaker malfunction. Approximately 80% of wide complex tachycardias are due to ventricular tachycardia.^[1] Therefore a thorough review of the potential causes of ventricular tachycardia is critical in the patient with a wide complex tachycardia.

Ventricular Tachycardia

Common causes of ventricular tachycardia include ischemic heart disease, illicit drugs (cocaine and methamphetamine), structural heart disease (including congenital heart diseases such as tetralogy of Fallot), inherited channelopathies, drug toxicity (digoxin, drugs that prolong the QT interval) and electrolyte disturbances (such as hypokalemia, hypomagnesemia, and hypocalcemia).

Causes

Common Causes

Across All Ages

Among Patients Under 35 Years of Age

Causes by Organ System

Cardiovascular	Acute coronary syndrome, Andersen cardiodysrhythmic periodic paralysis, Arrhythmogenic right ventricular dysplasia, AV block, Cardiomyopathy, Catecholaminergic polymorphic ventricular tachycardia, Congenital Heart Disease, Congestive heart failure, Hypertrophic cardiomyopathy, Ischaemic heart disease, Jervell and Lange-Nielsen syndrome, Long QT Syndrome, Myocardial Infarction, Myocarditis, NSTEMI, Right ventricular outflow tract tachycardia, Romano-Ward syndrome, 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, STEMI, Timothy syndrome, Torsade de pointes, Unstable angina, Valvular heart disease, Ventricular aneurysm, Wolff-Parkinson-White syndrome
Chemical / poisoning	Arsenic trioxide, Arsenicals
Dermatologic	No underlying causes
Drug Side Effect	Alimemazine, Almokalant, Amiodarone, Amitriptyline, Amphetamines, Antiarrhythmics, Asenapine, Astemizole, Azimilide, Azithromycin, Bepridil, Bretylium, Budipine, Chloroquine, Cibenzoline, Cisapride, Citalopram, Clomipramine, Clozapine, Cocaine, Crizotinib, Desipramine, Digitalis, Diphenhydramine, Disopyramide, Dofetilide, Dolasetron, Doxepin, Dronedarone, Droperidol, Eribulin mesylate, Fluconazole, Grepafloxacin, Halofantrine, Haloperidol, Ibutilide, Imipramine, Indapamide, Inotropes, Ketanserin, Ketoconazole, Lidoflazine, Lubeluzole, Methadone, Methadyl acetate, Methamphetamine, Midodrine, Mizolastine, Moxifloxacin, Naratriptan, Nicardipine, Nilotinib, Ondansetron, Pasireotide, Pazopanib, Pentamidine, Phenothiazines, Pimozide, Piperaquine, Prenylamine, Probucol, Procainamide, Propoxyphene, Quinidine, Quinine, Ranolazine, Retigabine, Ritodrine, Ritonavir, Saquinavir, Sertindole, Sotalol, Sparfloxacin, Sympathomimetic agents, Tedisamil, Telithromycin, Terfenadine, Terodiline, Tetrabenazine, Thioridazine, Vandetanib, Vemurafenib, Venlafaxine, Vernakalant, Voriconazole, Vorinostat, Ziprasidone, Zotepine, Zuclopenthixol
Ear Nose Throat	No underlying causes
Endocrine	Hyperthyroidism, Hypothyroidism, Pheochromocytoma
Environmental	Hypothermia, Zero gravity
Gastroenterologic	No underlying causes
Genetic	Channelopathies, Myotonic dystrophy, Andersen cardiodysrhythmic periodic paralysis, Jervell and Lange-Nielsen syndrome, Romano-Ward 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, Timothy syndrome
Hematologic	No underlying causes
Iatrogenic	Cardioversion, Defibrillation, Electrophysiologic studies, Heart surgery, Pulmonary artery catheter , Right heart catheterisation
Infectious Disease	No underlying causes
Musculoskeletal / Ortho	Andersen cardiodysrhythmic periodic paralysis, Timothy syndrome, Myotonic dystrophy
Neurologic	No underlying causes
Nutritional / Metabolic	Acidosis, Acid-base disturbances, Acute starvation, Electrolyte imbalance, Hyperkalaemia, Hypocalcemia, Hypoglycaemia, Hypokalemia, Hypomagnesemia
Obstetric/Gynecologic	No underlying causes
Oncologic	No underlying causes
Opthalmologic	No underlying causes
Overdose / Toxicity	Alimemazine, Almokalant, Amiodarone, Amitriptyline, Amphetamines, Antiarrhythmics, Asenapine, Astemizole, Azimilide, Azithromycin, Bepridil, Bretylium, Budipine, Caffeine,Chloroquine, Cibenzoline, Cisapride, Citalopram, Clomipramine, Clozapine, Cocaine, Crizotinib, Desipramine, Digitalis, Diphenhydramine, Disopyramide, Dofetilide, Dolasetron, Doxepin, Dronedarone, Droperidol, Eribulin mesylate, Fluconazole, Grepafloxacin, Halofantrine, Haloperidol, Ibutilide, Imipramine, Indapamide, Inotropes, Ketanserin, Ketoconazole, Lidoflazine, Lubeluzole, Methadone, Methadyl acetate, Methamphetamine, Midodrine, Mizolastine, Moxifloxacin, Naratriptan, Nicardipine, Nilotinib, Ondansetron, Pasireotide, Pazopanib, Pentamidine, Phenothiazines, Pimozide, Piperaquine, Prenylamine, Probucol, Procainamide, Propoxyphene, Quinidine, Quinine, Ranolazine, Retigabine, Ritodrine, Ritonavir, Saquinavir, Sertindole, Sotalol, Sparfloxacin, Sympathomimetic agents, Tedisamil, Telithromycin, Terfenadine, Terodiline, Tetrabenazine, Thioridazine, Vandetanib, Vemurafenib, Venlafaxine, Vernakalant, Voriconazole, Vorinostat, Ziprasidone, Zotepine, Zuclopenthixol
Psychiatric	Anorexia nervosa, Starvation
Pulmonary	Hypoxia, Obstructive sleep apnea, Sleep apnea
Renal / Electrolyte	Acidosis, Acid-base disturbances, Acute starvation, Electrolyte imbalance, Hyperkalaemia, Hypocalcemia, Hypoglycaemia, Hypokalemia, Hypomagnesemia
Rheum / Immune / Allergy	No underlying causes
Sexual	No underlying causes
Trauma	Myocardial contusion
Urologic	No underlying causes
Dental	No underlying causes
Miscellaneous	No underlying causes

Causes in Alphabetical Order

Supraventricular Tachycardia

Supraventricular tachycardia (SVT) with aberrant ventricular conduction, which is either new or due to a preexisting left or right bundle branch block or a preexisting nonspecific intraventricular conduction delay (IVCD). The underlying supraventricular rhythm that is aberrantly conducted can be any one of the following rhythms:

Atrial flutter with 2:1 conduction and occasional 1:1 conduction
Automatic junctional tachycardia
AV nodal reentrant tachycardia
AV reentrant tachycardia using a bypass tract
Intraatrial reentrant tachycardia
Paroxysmal atrial tachycardia
SA nodal reentrant tachycardia
Sinus tachycardia

Pre-Excitation Syndrome

The diagnosis of rapid antegrade conduction down a bypass tract due to ventricular pre-excitation such as Wolff-Parkinson-White syndrome (WPW) should be considered if

There is intermittent present of a Delta wave
There is intermittently a short PR interval

Paced Rhythms

A paced rhythm as a cause of wide complex tachycardia is infrequent. This diagnosis is suggested if

A pacemaker is in place and there is a LBBB pattern with superior left axis deviation, however, depending on the site of pacing this pattern can vary significantly
A wide complex tachycardia can be due to an SVT if the pacemaker is tracking sensed atrial activity and is pacing the ventricles rapidly as result
Pacemaker-mediated tachycardia may be present if there is retrograde conduction which triggers atrial activity during ventricular pacing.
Runaway pacemaker syndrome in which the pacemaker fires at a rate of nearly 2000 bpm and captures intermittently
Sensor induced tachycardia in which case the pacemaker fires at a rate of nearly 160-180 bpm in response to electrocautery, noise, vibration, limb movement or other stimuli.

References

↑ Lam P, Saba S (2002). "Approach to the evaluation and management of wide complex tachycardias". Indian Pacing and Electrophysiology Journal. 2 (4): 120–6. PMC 1557420. PMID 16951728. Retrieved 2013-08-04.

Template:WH Template:WS

[pmid16951728-1] Lam P, Saba S (2002). "Approach to the evaluation and management of wide complex tachycardias". Indian Pacing and Electrophysiology Journal. 2 (4): 120–6. PMC 1557420. PMID 16951728. Retrieved 2013-08-04.

[1]

@@ Line 332: / Line 332: @@
 :*A wide complex tachycardia can be due to an SVT if the pacemaker is tracking sensed atrial activity and is pacing the ventricles rapidly as result
 :*[[Pacemaker-mediated tachycardia]] may be present if there is retrograde conduction which triggers atrial activity during ventricular pacing.
+:*[[Runaway pacemaker syndrome]] in which the pacemaker fires at a rate of nearly 2000 bpm and captures intermittently
+:*[[Sensor induced tachycardia]] in which case the pacemaker fires at a rate of nearly 160-180 bpm in response to electrocautery, noise, vibration, limb movement or other stimuli.
 ==References==