American heart association study
https://www.ahajournals.org/doi/10.1161/CIRCEP.120.008662
29 Apr 2020
Conclusions
In the largest reported cohort of COVID-19 patients to date treated with chloroquine/hydroxychloroquine {plus minus} azithromycin, no instances of TdP or arrhythmogenic death were reported. Although use of these medications resulted in QT prolongation, clinicians seldomly needed to discontinue therapy.