In MADIT-RIT , 1500 patients with a primary prophylactic indication for ICD or cardiac resynchronization therapy with defibrillator were randomized to 1 of 3 different ICD programming arms : conventional programming ( ventricular tachycardia zone 170 beats per minute ) , high-rate programming ( ventricular tachycardia zone 200 beats per minute ) , and delayed programming ( 60-second delay before therapy 170 beats per minute ) .