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We acknowledge that the screening process for echocardiography requests creates important selection bias, and we do not suggest that these findings apply across all patients with COVID-19. Prospective studies, and correlation of echocardiographic data with disease severity, biomarkers, and clinical outcomes, will be required to understand the range of cardiovascular involvement in COVID-19.

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QTc can be underestimated or unreported by the computer analysis. Physicians not only should calculate QTc manually but also examine the actual QTc value displayed on the report before concluding that this parameter is normal, especially in patients who are at risk of QTc prolongation.