Ventricular tachycardia is a fast heart rhythm originating from the ventricles with a rate over 100 beats per minute and a regular rhythm. P waves are dissociated or retrograde and QRS complexes are broad. It commonly occurs in adults with prior heart attacks, chronic coronary artery disease, or dilated cardiomyopathy. Treatment may include cardioversion, digitalis, or intravenous procainamide hydrochloride.