Causes of Ventricular Tachycardia

In this article, we will discuss various Causes of Ventricular Tachycardia. So, let’s get started.

Ventricular Tachycardia is a wide QRS (>0.12 sec) tachycardia consisting of 3 or more consecutive ventricular premature beats at a rate of >100 bpm. The sudden onset of a wide QRS tachycardia usually rings an alarm bell if the patient is symptomatic. If left untreated, VT may degenerate into a fatal ventricular flutter. VT may be sustained (persists for >30 seconds) or nonsustained (does not persist beyond 30 seconds). The sustained VT requires termination because of hemodynamic consequences. Repeated episodes (>2 in 24 hours) of VT require external cardioversion/defibrillation or DC shock therapy.


  • Acute myocardial infarction or ischemia
  • Cardiomyopathy (ischemic or idiopathic)
  • Electrolyte disturbance (e.g. hypokalemia, hypomagnesemia)
  • Drugs (e.g. digitalis and other proarrhythmics)
  • Myocarditis, mitral valve prolapse
  • Reperfusion
  • Ventricular aneurysm
  • Pacemaker mediated (e.g. DDD pacemaker)
  • Mechanically induced by a pacing catheter or flow-directed pulmonary artery catheter.
  • Idiopathic
  • Miscellaneous such as right ventricular dysplasia, Bergada syndrome, sarcoidosis.

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