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QT prolongation in a diverse, urban population of COVID-19 patients treated with hydroxychloroquine, chloroquine, or azithromycin

  • C Hsia, Brian1
  • Greige, Nicolas1
  • A Quiroz, Jose1
  • S Khokhar, Ahmed1
  • Daily, Johanna1, 1
  • Di Biase, Luigi1
  • J Ferrick, Kevin1
  • D Fisher, John1
  • Krumerman, Andrew1
  • 1 Albert Einstein College of Medicine & Montefiore Medical Center,
Published Article
Journal of Interventional Cardiac Electrophysiology
Publication Date
Jul 11, 2020
DOI: 10.1007/s10840-020-00822-x
PMID: 32654098
PMCID: PMC7352082
PubMed Central


Purpose Hydroxychloroquine, chloroquine, and azithromycin have been used for treatment of COVID-19, but may cause QT prolongation. Minority populations are disproportionately impacted by COVID-19. This study evaluates the risk of QT prolongation and subsequent outcomes after administration of these medications in largely underrepresented minority COVID-19 patients. Methods We conducted an observational study on hospitalized COVID-19 patients in the Montefiore Health System (Bronx, NY). We examined electrocardiograms (ECG) pre/post-medication initiation to evaluate QTc, HR, QRS duration, and presence of other arrhythmias. Results One hundred five patients (mean age 67 years; 44.8% F) were analyzed. The median time from the first dose of any treatment to post-medication ECG was 2 days (IQR: 1–3). QTc in men increased from baseline (440 vs 455 ms, p < 0.001), as well as in women (438 vs 463 ms, p < 0.001). The proportion of patients with QT prolongation increased significantly (14.3% vs 34.3%, p < 0.001) even when adjusted for electrolyte abnormalities. The number of patients whose QTc  >  500 ms was significantly increased after treatment (16.2% vs. 4.8%, p < 0.01). Patients with either QTc  >  500 ms or an increase of 60 ms had a higher frequency of death (47.6% vs. 22.6%, p = 0.02) with an odds ratio of 3.1 (95% CI: 1.1–8.7). Adjusting for race/ethnicity yielded no significant associations. Conclusions Hydroxychloroquine, chloroquine, and/or azithromycin were associated with QTc prolongation but did not result in fatal arrhythmias. Our findings suggest that any harm is unlikely to outweigh potential benefits of treatment. Careful risk-benefit analyses for individual patients should guide the use of these medications. Randomized control trials are necessary to evaluate their efficacies.

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