A case of doxazosin-induced acute coronary syndrome in a patient with myocardial bridging.

Myocardial bridging (MB) is an anatomical variation characterized by narrowing during systole of some of the epicardial coronary arterial segments running in the myocardium. It can be encountered in 0.5% to 16% of routine coronary angiographies [1]. Although it is considered as a benign anomaly, it may lead to such complications as myocardial ischemia, acute coronary syndromes, coronary spasm, exercise-induced dysrhythmias such as supraventricular tachycardia, ventricular tachycardia, syncope, or even sudden death [2]. In this report, we present a previously unreported case of a 51-year-old man with doxazosin-induced acute coronary syndrome, who was diagnosed with myocardial bridging overlying the left anterior descending artery.