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Patient 1. A: Baseline electrocardiogram (ECG) results: heart rate (HR) 80 beats per minute, QT 260 milliseconds, corrected QT (QTc) 300 milliseconds. B: ECG recorded during treatment with 500 mg of HQ twice daily: HR 65 beats per minute, QT 320 milliseconds, QTc 333 milliseconds. C: ECG recorded during treatment with 80 mg of sotalol twice daily: bigeminy, QT interval 280 milliseconds.
