Cardiac events during the observation period
| VVI | DDDR | p Value | |
|---|---|---|---|
| CHF, congestive heart failure. | |||
| n | 41 | 41 | |
| Observation time (years) (mean (SD)) | 2.8 (1.1) | 2.7 (1.1) | NS |
| Heart transplantation | 2 | 5 | |
| CHF death | 1 | 3 | |
| Sudden death | 4 | 6 | |
| Upgrade to biventricular pacing because of refractory heart failure | 1 | 3 | |
| Total number of major cardiac events | 8 (19%) | 17 (41%) | 0.03 |