Myopericarditis Presenting as Acute ST-Elevation Myocardial Infarction with Atrioventricular Dissociation.

Myopericarditis, which is an inflammatory process involving the myocardium and pericardium, is not a rare condition encountered in cardiac emergencies. Rarely though, it can give an acute myocardial infarction picture on electrocardiogram (ECG), leading to urgent angiography. More rarely, it can be associated with atrioventricular (AV) dissociation, which is a condition of dyssynchrony of electrical activity between atria and ventricles. We present the case of a young female, who presented with severe chest pain, associated with ST elevation in anterior leads of ECG and raised troponins, necessitating urgent coronary angiography. Normal coronaries led to further evaluation, including cardiac magnetic resonance imaging, which established the diagnosis of myopericarditis. The patient had AV dissociation secondary to myopericarditis. With the treatment of myopericarditis and transvenous pacing, the patient stabilized and was subsequently discharged asymptomatic.