Table 2.
ECG findings
| ECG finding | All (n = 290) | Excellent ECG quality sample† (n = 189) | P value |
|---|---|---|---|
| Sinus rhythm | 246 (84.8) | 160 (84.7) | 1.000 |
| Atrial fibrillation or flutter | 35 (12.1) | 24 (12.7) | .794 |
| Narrow or broad complex tachycardia | 5 (1.7) | 3 (1.6) | 1.000 |
| Atrial junctional rhythm | 1 (0.3) | 0 (0) | .750 |
| Ectopy | 28 (9.7) | 22 (11.6) | .175 |
| Bundle branch block | 25 (8.6) | 19 (10.1) | .332 |
| Left bundle branch block | 12 (4.1) | 7 (3.7) | .843 |
| Right bundle branch block | 5 (1.7) | 4 (2.1) | .819 |
| Bifascicular block | 7 (2.4) | 7 (3.7) | .120 |
| Trifascicular block | 1 (0.3) | 1 (0.5) | 1.000 |
| AV block | 13 (4.5) | 6 (3.2) | .240 |
| High-degree AV block | 0 (0) | 0 (0) | 1.000 |
| Prolonged QT interval (QTc >480 ms) | 5 (1.7) | 4 (2.1) | .819 |
| Left ventricular hypertrophy | 11 (3.8) | 9 (4.8) | .390 |
| Significant ST elevation | 6 (2.1) | 2 (1.1) | .222 |
| Significant ST depression | 6 (2.1) | 5 (2.6) | .610 |
| T-wave inversion | 9 (3.1) | 6 (3.2) | 1.000 |
| Pathologic Q waves | 8 (2.8) | 7 (3.7) | .333 |
| Major ECG abnormalities | 71 (24.5) | 51 (27.0) | .226 |
| Indication of (past) ischemia | 26 (9.0) | 18 (9.5) | .811 |
| Clinically relevant impulse or conduction abnormality | 27 (9.3) | 19 (10.1) | .702 |
Data are number (percentage). P value is for difference between excellent (n = 189) and non-excellent (n = 101) ECG quality sample.
AV = atrioventricular; ECG = electrocardiogram; QTc = corrected QT interval; ST = ST interval.
†
Excellent ECG quality was defined as no or mild noise and/or up to 1 lead with baseline drift.