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We report a 3-year-old girl with left ventricular outflow tract obstruction after repair of ostium primum defect. The girl had closure of an ostium primum defect performed at the age of 1 year. Two years later, she developed left ventricular hypertrophy with systolic ejection murmur. Echocardiography showed discrete stenosis of the left ventricular outflow tract. Cardiac catheterization showed a peak systolic gradient of 63 mmHg across the left ventricular outflow tract. At the reoperation, the fibrous tissue was excised and myectomy was done. After the operation the peak systolic gradient across the left ventricular outflow tract disappeared. Since there is a possibility of occurrence of the left ventricular outflow tract obstruction after repair of atrioventricular septal defect, long term follow up is mandatory.
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