The authors report this man decompensated within a day of his fifth shot and required defibrillation, mechanical ventilation, and full life support measures for myocarditis which precipitated the cardiac arrest, conduction defects, and heart failure. He stayed in the hospital over a month. The patient was an 81-year-old man.

“Two weeks before his fifth COVID-19 vaccination, no worsening of his heart failure was detected at our regular outpatient clinic. However, on the day following bivalent BNT162b2 (wild and BA.4-5) vaccination (Pfizer–BioNTech), he was rushed to our hospital with dyspnea.”

New study shows heart damage after COVID vaccine shot