# Unveiling a Rare Side Effect: A Report of a Unique Case of Second-Degree Type 2 Sinoatrial Node Exit Block Induced by Adenosine Infusion

## TL;DR

A rare case of a heart rhythm issue caused by adenosine infusion is reported in a young man.

## Contribution

This paper presents a unique clinical case of a second-degree type 2 sinoatrial node exit block induced by adenosine.

## Key findings

- Adenosine infusion in a 25-year-old male caused a second-degree type 2 sinoatrial node exit block.
- The case highlights the rare but possible risk of adenosine in affecting sinoatrial node function.

## Abstract

Adenosine is a widely used pharmacologic agent in the field of cardiology, predominantly for the termination of supraventricular tachycardias and diagnostic purposes. Most of the side effects are short-lasting due to its very short half-life. Fatal complications of adenosine are rare but can include ventricular fibrillation, ventricular tachycardia, and asystole. Proper medical supervision and monitoring are crucial to minimize risks. We report a unique case of a second-degree type 2 sinoatrial node exit block following intravenous adenosine administration in a 25-year-old male presenting with palpitations.