Table 2.
ICD Programming
| Variable | Follow‐Up Population (N=4296) | Primary Prevention (N=2758) | Secondary Prevention (N=1538) | P Value |
|---|---|---|---|---|
| Detection zones enabled | ||||
| Single zone* | 1853 (43.2) | 1451 (52.6) | 402 (26.2) | <0.001 |
| Multiple zones | 2440 (56.8) | 1305 (47.4) | 1135 (73.8) | |
| VF detection interval, ms | 302.7±19.4 | 302.9±18.7 | 302.4±20.4 | 0.396 |
| NID | <0.001 | |||
| <30/40 | 2490 (58) | 1508 (54.7) | 982 (63.8) | |
| ≥30/40 | 1805 (42) | 1249 (45.3) | 555 (36.2) | |
| Fast VT detection zone enabled † | 1557 (36.3) | 879 (31.9) | 678 (44.1) | <0.001 |
| Fast VT detection interval, ms † | 266.5±29.4 | 263.7±26 | 270±32.9 | <0.001 |
| VT detection interval, ms ‡ | 361.6±25.3 | 358.7±20.4 | 366.7±31.5 | <0.001 |
| NID ‡ | 0.617 | |||
| ≤16 | 1395 (57.2) | 740 (56.7) | 655 (57.7) | |
| ≥20 | 1045 (42.8) | 565 (43.3) | 480 (42.3) | |
| SmartShock technology–capable device | 2930 (72.1) | 1890 (72.6) | 1040 (71.0) | 0.267 |
Data are given as number (percentage) or mean±SD. ICD indicates implantable cardioverter‐defibrillator; NID, number of intervals to detect; VF, ventricular fibrillation; and VT, ventricular tachycardia.
*
Patients with fast VT zone enabled through VF zone, but without any other VT zone activated, were also considered as single‐zone detection patients.
†
Through VF detection zone.
‡
Applies only to multiple‐zone detection programming patients.