An anomalous left coronary artery from the pulmonary artery (ALCAPA) is rarely associated with persistent ductus arteriosus (PDA). A large PDA can maintain perfusion in the left coronary artery, delaying presentation. Assessing the origin of the coronary arteries before PDA ligation is difficult, often being performed in very small or even preterm babies. We present the case of a 5-month-old infant with echocardiographic features of mitral regurgitation and subendocardial ischemia who experienced ischemia and cardiac arrest after PDA ligation. Transesophageal echocardiography demonstrated ALCAPA, and left coronary translocation was performed. The infant was discharged after 10 days.
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