Dear Editor,

We would like to share ideas on the publication “Tachycardia as an undescribed adverse effect to the Comirnaty© vaccine (BNT162b2 Pfizer-BioNTech Covid-19 vaccine): Description of 3 cases with a history of SARS-CoV-2 disease.” We feel it vital to confirm the development of this adverse event following vaccination administration in subjects with a history of prior SARS-CoV-2 infection and, if it is verified, take the necessary steps in subjects with prior cardiac disease, according to Marco Garca et al. We agree that the COVID-19 vaccine can have certain side effects, and that tachycardia may be a clinical issue after vaccination. As Marco Garca et al. pointed out, the problem could be caused by a personal ailment in the background. Before concluding that the clinical condition is caused by the vaccine, a thorough assessment is required. Furthermore, we must consider the possibility that the problem is caused by a coexisting medical condition. A COVID-19 vaccine recipient, for example, can contract dengue fever and develop tachycardia. Before disclosing any new suspected side effect of the COVID-19 vaccination, it is customarily necessary to conduct a thorough examination for confirmation.

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Conflict of interest

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