Table 2.
Unadjusted Event Rates by PR Interval After Stratification by Device type
| Outcome | ICD | CRT-D | ||||
|---|---|---|---|---|---|---|
| PR<230 ms | PR≥230 ms | P Value | PR<230 ms | PR≥230 ms | P Value | |
| Heart failure hospitalization or death, n (%) | ||||||
| 1 y | 1015 (15.8) | 212 (18.8) | 0.0108 | 2709 (16.9) | 645 (22.2) | <0.0001 |
| 3 y | 2083 (32.4) | 441 (39.1) | <0.0001 | 4900 (30.6) | 1192 (41.0) | <0.0001 |
| 5 y | 2540 (39.6) | 530 (46.9) | <0.0001 | 5727 (35.8) | 1365 (47.0) | <0.0001 |
| Death, n (%) | ||||||
| 1 y | 459 (7.1) | 93 (8.2) | 0.2034 | 1262 (7.9) | 329 (11.3) | <0.0001 |
| 3 y | 1322 (20.6) | 29 1(25.8) | 0.0003 | 3137 (19.6) | 761 (26.2) | <0.0001 |
| 5 y | 1787 (27.8) | 398 (35.3) | <0.0001 | 4009 (25.1) | 957 (32.9) | <0.0001 |
| Heart failure hospitalization, n (%) | ||||||
| 1 y | 702 (10.9) | 151 (13.4) | 0.0105 | 1903 (11.9) | 432 (14.9) | <0.0001 |
| 3 y | 1281 (19.9) | 282 (25.0) | 0.0002 | 3080 (19.3) | 779 (26.8) | <0.0001 |
| 5 y | 1513 (23.6) | 329 (29.1) | 0.0001 | 3466 (21.7) | 866 (29.8) | <0.0001 |
The log rank test was used for heart failure hospitalization or death and death end points; the Gray test was used for the heart failure hospitalization end point.
CRT-D indicates cardiac resynchronization therapy with defibrillator; and ICD, implantable cardioverter defibrillator.