Table 3.
Subgroup analysis comparing patients with [NSVT (+)] vs without [NSVT (-)] nonsustained ventricular tachycardia (NSVT) on implantable cardiac monitoring
| Characteristic | NSVT (+), n = 20 | NSVT (–), n = 11 | P |
|---|---|---|---|
| Age, y | 54.3 (SD 11.8) | 46.8 (SD 13.6) | 0.14 |
| Male | 14 (70) | 5 (45.5) | 0.18 |
| ESC 5-year risk of sudden cardiac death | |||
| Low risk (< 4%) | 12 (60) | 8 (72.7) | 0.75 |
| Moderate risk (4%-6%) | 6 (30) | 2 (18.2) | |
| High risk (> 6%) | 2 (10) | 1 (4.5) | |
| AHA/ACC class | |||
| I | 0 (0) | 0 (0) | 0.57 |
| IIA | 10 (50) | 8 (72.7) | |
| IIB | 6 (30) | 1 (9.1) | |
| III | 4 (20) | 2 (18.2) | |
| Risk factors | |||
| Family history of sudden cardiac death | 3 (15) | 3 (27.3) | 0.41 |
| Maximum wall thickness > 30 mm | 0 (0) | 2 (18.2) | 0.05 |
| Maximum wall thickness, mm | 21.0 (SD 3.7) | 22.5 (SD 6.8) | 0.74 |
| Unexplained syncope | 4 (20) | 4 (36.4) | 0.32 |
| Abnormal blood pressure response to exercise | 2 (10) | 2 (18.2) | 0.52 |
| Left atrial diameter, mm | 41.9 (SD 5.8) | 38.2 (SD 11.0) | 0.51 |
| Maximum left ventricular outflow gradient | 22.8 (SD 31.9) | 21.7 (SD 20.8) | 0.92 |
| Late gadolinium enhancement (> 15%) | 3 (15) | 2 (18.2) | 0.85 |
| Left apical aneurysm | 3 (15) | 0 (0) | 0.11 |
| LVEF, % | 63.6 (SD 8.5) | 65.3 (SD 5.5) | 0.47 |
Values are n (%) or mean (SD), unless otherwise indicated. P values for categorical variables were obtained via χ2 tests, and via t tests for continuous variables.
AHA/ACC, American Heart Association/American College of Cardiology; ESC, European Society of Cardiology; LVEF, left-ventricular ejection fraction; SD, standard deviation.