ventricular tachycardia

:  tachycardia that is associated with the generation of electrical impulses within the ventricles and is characterized by an electrocardiogram having a broad QRS complex Or a heart may suddenly start beating much too fast, a condition called ventricular tachycardia, and then lapse into ventricular fibrillation.—Jane E. Brody, The New York Times, 13 Apr. 1999 To stop ventricular tachycardia, the defibrillator sends out painless electrical pacing impulses that return the heartbeat to a normal rhythm.—Tom Majeski, The Saint Paul (Minnesota) Pioneer Press, 27 Nov. 1997—abbreviation VT; called also V-tach