# Lack of Vaccination Against COVID-19, Obesity and Coexistence of Cardiovascular Diseases as Independent Predictors of a Higher Number of ECG Changes in Patients with Previous SARS-CoV-2 Infection

## TL;DR

This study found that unvaccinated people who had COVID-19 had more heart rhythm issues compared to vaccinated individuals, suggesting vaccination may help prevent arrhythmias.

## Contribution

The study identifies lack of vaccination as an independent predictor of increased arrhythmias in post-COVID-19 patients.

## Key findings

- Unvaccinated post-COVID-19 patients had more ventricular extrasystoles compared to vaccinated patients.
- Obesity and lack of vaccination were linked to higher rates of both ventricular and supraventricular extrasystoles.
- β-blockers and ACE inhibitors were found to protect against increased arrhythmia rates.

## Abstract

Objectives. Many studies have confirmed the existence of a relationship between SARS-CoV-2 virus infection and an increased incidence of arrhythmia in the population of adults, children and adolescents. It is believed that one of the potential side effects of COVID-19 vaccination is arrhythmia. However, large-scale studies confirming the relationship between COVID-19 vaccination and cardiac arrhythmia are currently lacking. The objective of this study was to analyze the occurrence of arrhythmias in 24 h Holter ECG monitoring among patients who had experienced COVID-19, comparing those who were vaccinated against SARS-CoV-2 with those who were unvaccinated. Methods. The study was performed on a study group of 237 patients, who underwent 24 h Holter monitoring. Results. Ventricular extrasystoles (VEs) were distinctively more common in patients, who had COVID-19 infection and were not vaccinated for COVID-19 comparing to the control group. Similarly, research has shown that supraventricular extrasystoles (SVEs) occurred remarkably more frequently in both unvaccinated and vaccinated patients after COVID-19 infection in relation to control groups. Multivariable regression analysis demonstrates that, in the whole study group, obesity, arterial hypertension, previous myocardial infarction and lack of vaccination against COVID-19 are independent risk factors for higher VE rates. Obesity, diabetes type 2 and lack of vaccination against COVID-19 are independent risk factors for higher SVE rates. The use of β-blockers is an independent protective factor against higher VE and SVE rates, and the use of ACE inhibitors against higher SVE rates. Conclusions. In this study, the authors obtained promising results for the future, facilitating further discussion and research on the topic of the antiarrhythmic advantages of COVID-19 vaccination. Moreover, the knowledge acquired in this study serves as a valuable tool for effectively promoting COVID-19 vaccination among patients.