# Acute myocardial infarction and cardiac arrest induced by oxymetazoline nasal spray overdose: a case report

## TL;DR

A man had a cardiac arrest after overusing a nasal spray, highlighting the dangers of its excessive use.

## Contribution

This case report highlights oxymetazoline overdose as a rare but serious cause of cardiac arrest in healthy individuals.

## Key findings

- A 27-year-old man experienced cardiac arrest after excessive use of oxymetazoline nasal spray.
- Cardiac biomarkers were elevated, but coronary angiography showed normal arteries.
- The patient recovered with rehabilitation despite prolonged neurological effects.

## Abstract

Oxymetazoline nasal spray is a widely used over-the-counter sympathomimetic decongestant. While generally safe at therapeutic doses, overdose can result in systemic vasoconstriction and potentially life-threatening cardiovascular complications.

We report the case of a previously healthy 27-year-old man who presented after an out-of-hospital cardiac arrest following excessive use of oxymetazoline nasal spray. He was found in ventricular fibrillation and required cardiopulmonary resuscitation and defibrillation. Post-resuscitation electrocardiogram showed transient ST-segment elevations, and cardiac biomarkers were markedly elevated. However, emergent coronary angiography revealed normal coronary arteries. Comprehensive cardiac evaluation, including cardiac magnetic resonance imaging and electrophysiologic studies, excluded myocardial infarction, myocarditis, myocardial fibrosis, and Brugada syndrome. The patient experienced prolonged neurological recovery but improved with rehabilitation.

Oxymetazoline overdose should be considered a potential cause of acute coronary syndrome, malignant arrhythmias, and cardiac arrest, even in young individuals without pre-existing cardiovascular disease. Clinician awareness and patient education on the safe use of sympathomimetic agents are essential for prevention.