Cardiac resynchronization therapy guided by cardiovascular magnetic resonance

Table 2 American College of Cardiology/American Heart Association/Heart Rhythm Society guidelines for cardiac resynchronization therapy (2008).*

Recommendation	Patient population	Class *
CRT-D/CRT-P	NYHA Class III/IV	I
	LVEF ≤ 35%, SR
	QRS ≥ 120 ms
	Optimal medical therapy
CRT-D/CRT-P	NYHA Class III/IV	IIa
	LVEF ≤ 35%,
	Optimal medical therapy
	Frequent dependence on
	ventricular pacing
CRT-D/CRT-P	NYHA Class III/IV	IIa
	LVEF ≤ 35%
	QRS ≥ 120 ms
	Optimal medical therapy
	Atrial fibrillation
CRT-D/CRT-P	NYHA Class I or II	IIb
	LVEF ≤ 35%
	Optimal medical therapy
	Dvice implant with anticipated
	frequent ventricular pacing

*Recommendations taken from Epstein AE, et al. [127] Class and level of evidence, according to ACC/AHA/HRS classification, is shown in the column. CRT-P = cardiac resynchronization therapy pacing; CRT-D = cardiac resynchronization therapy - defibrillation.

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