From: Cardiac resynchronization therapy guided by cardiovascular magnetic resonance
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 |  |