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Characteristics of the 591 paired ECGs before and during hydroxychloroquine treatment
| Pretreatment | On treatment | P value | |
|---|---|---|---|
| Ventricular rate (bpm) | 72.3 ± 14.9 | 74.9 ± 17.7 | .001 |
| QRS duration (ms) | 98.1 ± 20.2 | 101.7 ± 23.3 | <.0001 |
| QT interval (ms) | 392.6 ± 42.8 | 393.9 ± 45.2 | .49 |
| QTc-Bazett (ms) | 424.4 ± 29.7 | 432.0 ± 32.3 | <.0001 |
| QTc-Framingham (ms) | 412.7 ± 28.3 | 416.8 ± 29.9 | .006 |
| QTc-Fridericia (ms) | 412.9 ± 28.3 | 417.4 ± 30.4 | .003 |
Continuous variables were given as mean ± SD.
ECG = electrocardiogram.
