Dilated cardiomyopathy due to congenital anomaly of coronary artery

**Definition:** Dilated cardiomyopathy due to a congenital anomaly of one or more coronary arteries, such as anomalous left coronary artery from pulmonary artery (ALCAPA), coronary ostial stenosis or atresia, right ventricular dependent coronary circulation in pulmonary atresia with an intact ventricular septum. It is a form of ischaemic cardiomyopathy causing systolic ventricular dysfunction that relates to a spectrum of perfusion contraction matching and mismatching, including myocardial infarction, stunning, hibernation and scarring.

**Long definition:** This may also occur as a complication of surgical procedures for congenital heart disease requiring translocation of the coronary arteries, such as the arterial switch procedure for transposition of the great arteries and pulmonary autograft replacement of the aortic valve (Ross procedure).