| Baseline Characteristic |
| Heart Failure Symptoms |
| LVEF |
| Rhythm |
| Life Expectancy |
| Frailty |
| Favours RV based Pacing |
| No heart failure or NYHA I |
| LVEF >45% |
| Persistent or permanent AF |
| <1 year |
| Higher frailty index or comorbidity score |
| Favours CRT based pacing |
| NYHA II, III or ambulatory IV heart failure |
| LVEF ≤45% |
| Sinus rhythm or paroxysmal AF |
| >1 year |
| Lower frailty index or comorbodity score |