VENTRICULAR TACHYCARDIA - is rapid heart rhythm that originates in one of the ventricles of the heart. It is a life-threatening arrhythmia. It may lead to ventricular fibrillation, asystole, and sudden death.
VENTRICULAR FIBRILLATION is a cause of cardiac arrest and sudden death. The ventricular muscle twitches randomly, rather than contracting in a coordinated fashion.