Ventricular Arrhythmias after COVID-19 Vaccination

Cleveland Clinic, Mayo Clinic Study Show Cardiac Side Effect Commonly Fatal

May 20, 2025

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By Peter A. McCullough, MD, MPH

I have many patients with abnormal heart beats (palpitations) or heart rhythm abnormalities after COVID-19 vaccination. The most dangerous of all cardiac rhythms are ventricular tachycardia and ventricular fibrillation because they can lead to cardiac arrest.

Ventricular tachycardia (VT): ECG criteria, causes, classification, treatment – The Cardiovascular — Rhythm strip depicting normal sinus rhythm and the onset of ventricular tachycardia. This is sufficient fast to cause syncope and collapse after several minutes.

Because the COVID-19 vaccines deposit mRNA and Spike protein in the heart which causes inflammation (myocarditis) it is not difficult to conclude that abnormalities in heart rhythm occur as a result of heart muscle inflammation. This is the case with other causes of myocarditis before the pandemic.

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