Poor Left Ventricular Performance in a Child With Coronary Sinus Stenosis: Successful Surgical Repair.

Atresia or stenosis of the coronary sinus is a rare congenital defect that can cause marked clinical manifestations, depending on the presence of concomitant anomalies securing adequate coronary venous outflow. We describe a 4.5-year-old boy admitted to the clinic with signs of congestive heart failure (left ventricular ejection fraction, 29%).