Table 1.
Baseline characteristics
| Patients undergoing His bundle pacing (n = 24) | |
|---|---|
| Age, years | 68 ± 10 (48 – 89) |
| Male | 15 (63%) |
| Ejection fraction (%) | 27 ± 8 (14 – 42.5) |
| NYHA functional class | 2.3 ± 0.7 (1 – 4) |
| I | 1 (4%) |
| II | 16 (67%) |
| III | 5 (21%) |
| IV | 2 (8%) |
| Previous MI | 10 (42%) |
| ACE inhibitor/ARB | 23 (96%) |
| β‐Blocker | 21 (88%) |
| MRA | 16 (67%) |
| Sacubitril | 2 (8%) |
| QRS duration (ms) | |
| Intrinsic activation | 173 ± 15 (136 – 208) |
| His bundle pacing | 144 ± 27 (106 – 184) |
| Biventricular pacinga | 157 ± 21 (109 – 195) |
| PR interval (ms) | 195 ± 50 (130 – 384) |
| Selective His bundle capture | 2 (8%) |
| Patients with narrow QRS (n = 21) | |
|---|---|
| Age, years | 43 ± 12 (25 – 68) |
| Male | 14 (67%) |
| Ejection fraction (%) | 57 ± 5 (49 – 75) |
| NYHA functional class | 1.1 ± 0.3 (1 – 2) |
| I | 19 (90%) |
| II | 2 (10%) |
| Previous MI | 0 (0%) |
| QRS duration (ms) | 98 ± 8 |
Abbreviations: CS, coronary sinus; MRA, mineralocorticoid receptor antagonist.
Note: Values are mean ± SD (range) or n (%). In one patient of patients with left bundle branch block undergoing His bundle pacing, the ejection fraction measured at referral was higher than 35%. One patient in the group of patients with a narrow intrinsic QRS had an ejection fraction of 49%, which is in the mildly impaired category but the assessment clinically was low‐normal function.
a
n = 21.