Congenital supravalvular mitral ring

Congenital supravalvular mitral ring (also known as supramitral ring or supravalvular mitral membrane) is a rare congenital heart defect in which an abnormal ridge or membrane of connective tissue forms on the atrial (upper) side of the mitral valve, within the left atrium. This fibrous ring partially obstructs blood flow from the left atrium into the left ventricle, functionally mimicking mitral stenosis. The condition affects the cardiovascular system and can lead to elevated pressures in the left atrium and pulmonary veins, resulting in pulmonary hypertension and heart failure if left untreated. Key symptoms depend on the degree of obstruction and may include shortness of breath (dyspnea), difficulty feeding and failure to thrive in infants, recurrent respiratory infections, exercise intolerance, and signs of congestive heart failure such as pulmonary edema. A heart murmur is often detected on physical examination. The condition is frequently associated with other congenital cardiac anomalies, including parachute mitral valve, subaortic stenosis, and coarctation of the aorta — a combination sometimes referred to as Shone complex. Diagnosis is typically made through echocardiography, which can visualize the abnormal membrane above the mitral valve. Treatment is surgical and involves excision (removal) of the supravalvular ring to relieve the obstruction. The timing of surgery depends on the severity of symptoms and the degree of hemodynamic compromise. Outcomes after surgical resection are generally favorable, though long-term follow-up is necessary to monitor for recurrence or progression of associated cardiac lesions.

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