Congenital mitral malformation

Congenital mitral malformation, also known as congenital mitral valve anomaly or congenital mitral valve disease, encompasses a group of rare structural abnormalities of the mitral valve that are present at birth. The mitral valve is located between the left atrium and left ventricle of the heart and normally ensures one-way blood flow. Malformations can affect any component of the mitral valve apparatus, including the valve leaflets, chordae tendineae, papillary muscles, or the annulus. These defects may result in mitral regurgitation (backward leakage of blood), mitral stenosis (narrowing that obstructs blood flow), or a combination of both. Clinical presentations vary widely depending on the severity and specific type of malformation. Patients may present in infancy or childhood with symptoms of heart failure, including shortness of breath, poor feeding, failure to thrive, recurrent respiratory infections, and exercise intolerance. In milder cases, the condition may remain asymptomatic until later in childhood or even adulthood. Specific subtypes include parachute mitral valve (where chordae insert into a single papillary muscle), double-orifice mitral valve, mitral valve arcade, supravalvular mitral ring, and isolated cleft of the mitral valve. Congenital mitral malformations may occur in isolation or in association with other congenital heart defects such as atrioventricular septal defects, coarctation of the aorta, or Shone complex. Management depends on the severity of the valve dysfunction and the presence of symptoms. Mild cases may be monitored with regular echocardiographic surveillance. Medical therapy, including diuretics and afterload-reducing agents, can help manage symptoms of heart failure. Surgical intervention, including mitral valve repair or replacement, may be necessary in cases with significant hemodynamic compromise. Valve repair is generally preferred over replacement in pediatric patients to preserve growth potential and avoid the complications of prosthetic valves. Long-term follow-up by a cardiologist experienced in congenital heart disease is essential, as progressive valve dysfunction or the need for reintervention is common.

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