ECG parameters | Non-QTPa (n = 789) | QTP (n = 235) | P value |
---|---|---|---|
ECG at diagnosis | |||
Heart rate, bpm | 90.9 ± 21.3 | 97.9 ± 24.4 |  < 0.001 |
QRS duration, ms | 89.8 ± 13.0 | 98.7 ± 23.3 |  < 0.001 |
PR interval, ms | 151.9 ± 27.3 | 151.4 ± 28.0 | 0.829 |
QT interval, ms | 346.0 ± 42.3 | 387.5 ± 43.5 |  < 0.001 |
Corrected QT intervalb, ms | 415.3 ± 22.0 | 479.6 ± 25.1 |  < 0.001 |
Axis, degree | 38 [13, 63] | 39 [9, 68] | 0.672 |
RV5 + SV1, MV | 2.12 ± 1.13 | 2.03 ± 1.11 | 0.296 |
TWDc/QT | – | 59.1 ± 11.5 | – |
Tpeak-Tendd/QT | – | 27.1 ± 7.0 | – |
U wave, % | 0 (0) | 9 (3.83) |  < 0.001 |
Atrioventricular block, % | 25 (3.17) | 11 (4.68) | 0.269 |
Left bundle branch block, % | 1 (0.13) | 3 (1.28) | 0.013 |
Right bundle branch block, % | 36 (4.56) | 27 (11.49) |  < 0.001 |
Left ventricular hypertrophy, % | 38 (4.82) | 16 (6.81) | 0.230 |
Sinus tachycardia, % | 234 (29.66) | 84 (35.74) | 0.077 |
Sinus bradycardia, % | 22 (2.79) | 2 (0.85) | 0.085 |
ST-segment depression, % | 36 (4.56) | 9 (3.83) | 0.630 |
Arrhythmic events during hospitalization | |||
Paroxysmal AF or ATe, % | 36 (4.56) | 31 (13.19) |  < 0.001 |
Frequent PVCsf, % | 29 (3.58) | 19 (8.09) | 0.005 |
VT or VFg, % | 5 (0.63) | 13 (5.53) | < 0.001 |