Abstract 191 Table 1 QRS duration in patients with heart failure and an implantable cardiac defibrillator

QRS category	No of patients
	Baseline	1st Follow-up	2nd Follow-up	3rd Follow-up	4th Follow-up
QRS <120 msec	87	85	78	63	54
QRS 120–149 msec	10	12	17	31	35
QRS ⩾150 msec	3	3	5	6	11