Table 2.
Electrocardiographic findings
| All patients (n = 219) | Severe (n = 95) | Non-severe (n = 124) | p | |
|---|---|---|---|---|
| Heart rate, (bpm) | 91.9 ± 17.9 | 95.3 ± 20.0 | 89.3 ± 15.8 | 0.019 |
| HR >100 bpm, n(%) | 69 (31%) | 39 (41%) | 30 (24%) | 0.008 |
| PVC, n (%) | 10 (5%) | 3 (3%) | 7 (6%) | 0.382 |
| PAC, n (%) | 9 (4%) | 6 (9%) | 3 (2%) | 0.150 |
| PR interval, (ms) | 155.0 ± 23.0 | 155.2 ± 23.0 | 154.8 ± 23.0 | 0.907 |
| PR < 120 ms, n (%) | 10 (4%) | 4 (%5) | 6 (5%) | |
| PR 120–200 ms, n (%) | 184 (84%) | 79 (94%) | 105 (91%) | |
| PR > 200 ms, n (%) | 5 (2%) | 1 (1%) | 4 (3%) | |
| PR depression, n (%) | 6 (3%) | 3 (3%) | 3 (2%) | |
| QRS duration, (ms) | 94.5 ± 19.8 | 94.8 ± 21.9 | 94.2 ± 18.2 | 0.844 |
| QRS > 120 ms, n (%) | 32 (14%) | 18 (19%) | 14 (11%) | 0.112 |
| QTc interval (ms) | 433.5 ± 27.5 | 435.6 ± 33.0 | 431.8 ± 22.8 | 0.322 |
| QTc > 500 ms, n (%) | 12 (5%) | 9 (9%) | 3 (2%) | 0.034 |
| RBBB, n (%) | 11 (5%) | 3 (3%) | 8 (6%) | 0.357 |
| IVCD, n (%) | 11 (5%) | 6 (6%) | 5 (4) | 0.538 |
| fQRS, n (%) | 26 (12%) | 17 (17%) | 9 (7%) | 0.016 |
| fQRS inferior, n (%) | 20 (9%) | 14 (14%) | 6 (5%) | 0.022 |
| fQRS lateral, n (%) | 6 (3%) | 3 (3%) | 3 (2%) | 0.981 |
| ST elevation, n (%) | 10 (4%) | 6 (6%) | 4 (3%) | 0.150 |
| ST depression, n (%) | 45 (20%) | 27 (28%) | 18 (14%) | 0.012 |
| ST depression anterior, n (%) | 4 (3%) | 0 (0%) | 4 (3%) | |
| ST depression inferior, n (%) | 18 (8%) | 13 (13%) | 5 (4%) | |
| ST depression lateral, n (%) | 20 (9%) | 11 (11%) | 9 (7%) | |
| ST depression common, n (%) | 3 (2%) | 3 (3%) | 0 (0%) | |
| T inversion, n (%) | 48 (22%) | 28 (29%) | 20 (16%) | 0.018 |
| T inversion anterior, n (%) | 16 (8%) | 9 (9%) | 7 (6%) | |
| T inversion inferior, n (%) | 12 (5%) | 10 (11%) | 2 (1%) | |
| T inversion lateral, n (%) | 20 (9%) | 9 (9%) | 11 (9%) | |
| ST-T change, n (%) | 62 (28%) | 35 (36%) | 27 (21%) | 0.014 |
Abbreviations: HR, heart rate; PVC, premature ventricular contractions; PAC, premature atrial contraction; QTc, corrected QT; RBBB, right bundle branch block; IVCD, intraventricular conduction delay; fQRS, fragmented QRS.
Data are given as mean ± SD.