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Electrocardiograms (ECG) and mobile continuous telemetry recordings from a patient with COVID-19 treated with hydroxychloroquine (HCQ) and azithromycin (AZM). A: Baseline ECG prior to HCQ/AZM, QRS duration (QRSd): 128 ms, QTc: 458 ms. B: ECG after 1 dose of HCQ/AZM, QRSd: 160 ms, QTc: 472 ms. C: Notification from mobile continuous telemetry (MCOT) of atrial fibrillation with a ventricular rate >150 beats per minute. D: Notification from MCOT with QTc measurement (520 ms).
