Table 1

Treatment options with ICD or CRT for people with heart failure who have left ventricular dysfunction with an LVEF of 35% or less (according to NYHA Class, QRS duration and the presence of LBBB)

	NYHA Class
QRS interval	I	II	III	IV
<120 ms	ICD if there is a high risk of sudden cardiac death			ICD and CRT not clinically indicated
120–149 ms without LBBB	ICD	ICD	ICD	CRT-P
120–149 ms with LBBB	ICD	CRT-D	CRT-P or CRT-D	CRT-P
≥150 ms with or without LBBB	CRT-D	CRT-D	CRT-P or CRT-D	CRT-P

Adapted from TA314. CRT, cardiac resynchronisation technology; LBBB, left bundle branch block; LVEF, left ventricular ejection fraction; NYHA, New York Heart Association.