VENTRICULAR TACHYCARDIA - Abnormal accelerated ventricular rhythm with a usual rate of 150 - 200 beats/minute. Because ventricular tachycardia originates in the ventricle, it appears as a wide complex rhythm on EKG. A potentially unstable rhythm that may result in fainting, low blood pressure, shock, or sudden death. Ventricular tachycardia has the potential of degrading to the more serious ventricular fibrillation. Ventricular tachycardia is a common, and often, lethal complication of acute myocardial infarction (heart attack).