Summary of relevant international guidance
| Device | Patient group | Recommendation | Reference |
|---|---|---|---|
| CRT-P | LVEF ≤35%, NYHA class II, III, ambulatory class IV: | 35 | |
| QRS≥150 ms with LBBB | Class I Level A | ||
| QRS≥150 ms without LBBB | Class IIa Level B | ||
| QRS ≥120 to <150 ms with LBBB | Class I Level B | ||
| QRS ≥120 to <150 ms without LBBB | Class IIb Level B | ||
| ICD | LVEF ≤35%, NYHA class II–III | 2 | |
| Ischaemic | Class I Level A | ||
| Non-ischaemic | Class I Level B | ||
| CRT-D | Patients in whom CRT-P is indicated and ICD is planned | Class I Level A | 35 |
| Patients with indicators of better prognosis and/or ischaemic heart disease | Class IIa Level B |
CRT-D, cardiac resynchronisation therapy pacemaker with defibrillation therapy; CRT-P, cardiac resynchronisation therapy pacemakers; ICD, implantable cardioverter defibrillators; LBBB, left bundle branch block; NYHA, New York Heart Association.