In this procedure, the provider surgically repairs a cor triatriatum or a supravalvular mitral ring defect by removing the excess membrane that restricts the flow of blood. A cor triatriatum is a congenital anomaly in which the left or right atrium is divided into two compartments by a fold of tissue, also referred to as a triatrial heart. A supravalvular mitral ring is a congenital defect in which an abnormal membrane of tissue on the atrial side of the mitral valve restricts the flow of blood from the left atrium to the left ventricle.
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