Table 1.
Clinical characteristics of the study population
| Characteristic | N=2668 |
|---|---|
| Age(SD), y | 63.1(13.0) |
| Female, % | 23.4 |
| White,% | 78.4 |
| Black,% | 9.7 |
| Hispanic,% | 7.5 |
| Ischemic CM, % | 57.0 |
| NICM, % | 43.0 |
| LVEF(SD),% | 28.2(11.1) |
| NYHA class I,% | 14.5 |
| NYHA class II,% | 39.6 |
| NYHA III,% | 43.2 |
| NYHA IV,% | 2.7 |
| Myocardial infarction,% | 49.1 |
| History of revascularization,% | 43.1 |
| Hypertension,% | 69.4 |
| Diabetes,% | 36.2 |
| Atrial fibrillation,% | 33.9 |
| History of stroke,% | 11.1 |
| Class I or III antiarrhythmic drugs,% | 11.2 |
| RAAS-modifying drugs,% | 78.7 |
| Use of beta-blockers,% | 85.1 |
| eGFRCKD-EPI(SD), mL/min/1.73 m2 | 70.4(29.0) |
| BUN(SD), mg/dL | 24.7(13.8) |
| ICD single-chamber,% | 36.2 |
| ICD dual-chamber,% | 26.9 |
| CRT-D,% | 36.3 |
| ICD replacement,% | 30.2 |
| VT detection zone programmed,% | 90.5 |
| Antitachycardia pacing ON,% | 85.8 |
| VT zone (SD),bpm | 178(15) |
| VF zone (SD),bpm | 225.4(48.3) |
| Historic ICD therapies programming,% | 67.3 |
| Delayed ICD therapies programming,% | 32.7 |
| Medtronic device,% | 60.5 |
| Boston Scientific device,% | 24.3 |
| St. Jude device,% | 13.4 |
| Heart rate(SD), bpm | 71.5(15.3) |
| QRS duration(SD), ms | 117.0(35.8) |
| QTc Hodges(SD), ms | 448.5(47.0) |
| Area QRS-T angle (mean(length),° | 144.6(0.853) |
| Area SVG elevation mean(length),° | 87.4(0.866) |
| Area SVG azimuth mean(length),° | 56.8(0.528) |
| Area SVG magnitude(SD). mVms | 41.1(24.6) |
| SAIQRST(SD), mVms | 194.9(110.4) |