A Rare Case of Myopericarditis Following Campylobacter Gastroenteritis in an Immunocompetent Young Adult

Myopericarditis is a rare but recognised extra-intestinal manifestation of <i>Campylobacter jejuni</i> infection, particularly in the absence of any underlying disease. While <i>Campylobacter</i> is a common cause of bacterial gastroenteritis, its potential to cause cardiac involvement is usually underestimated.The pathogenic process is not well elucidated but is most likely to involve direct bacterial invasion, immune processes, or systemic inflammation. In the early stages, symptoms may simulate acute coronary syndromes and therefore present diagnostic challenges. We present the case of a previously healthy young adult patient who had developed myopericarditis following an episode of self-limiting <i>Campylobacter</i> gastroenteritis. The diagnosis was established by electrocardiography, cardiac biomarker testing, echocardiogram (ECG), and cardiac magnetic resonance imaging (CMRI). Late gadolinium enhancement revealed sub-epicardial enhancement in the basal inferior and inferolateral segments, consistent with myopericarditis. The patient was conservatively managed with intravenous fluids, analgesia, and cardiac monitoring and made a complete recovery. This case emphasises the requirement of a strong suspicion of cardiac complications in patients presenting with chest pain following recent gastrointestinal illness. Prompt identification and adequate management can yield excellent results and prevent disastrous outcomes.