[Postoperative coil embolization of residual MAPCAs greatly improved left heart failure in a patient after corrective surgery for pulmonary atresia, ventricular septal defect and MAPCAs].

A male child, aged 1 year, with pulmonary atresia, ventricular septal defect and major aorto-pulmonary collateral arteries (PA, VSD, MAPCA) underwent corrective surgery including MAPCA ligation uneventfully. A few hours after admission to the ICU, severe heart failure, refractory to aggressive cardiac support including epinephrine infusion, became worse. Emergent cardiac catheterization on postoperative day 5 demonstrated the residual MAPCA and its occlusion by coil embolization dramatically resolved heart failure, indicating that the primary cause of this hemodynamic instability was likely excessive left-to-right shunt due to MAPCA. Residual LR shunt should be kept in mind to be a rare but significant cause of postoperative serious heart failure.