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. 2020 Jul 3;17(9):1480–1486. doi: 10.1016/j.hrthm.2020.07.001

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© 2020 The Authors

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Schematic diagram of the recommendations for electrocardiographic (ECG) monitoring during (hydroxy)chloroquine prophylaxis. ∗Individuals at risk are defined as those with a known history of congenital or acquired long QT syndrome, structural heart disease, bradycardia, use of other QT-prolonging drugs, and conditions with an increased risk of electrolyte disorders (such as chronic diarrhea or chronic kidney disease). ^†Symptom education for patients, ensuring awareness of potential arrhythmic symptoms (eg, dizziness, syncope, and palpitations). QTc = corrected QT.