Key result
Resection of accessory mitral valve tissue relieves LVOT obstruction, cutting peak velocity to ~1.6 m/s.
Why the study?
Accessory mitral valve tissue is a rare congenital anomaly that may cause left ventricular outflow tract obstruction, but clinical presentations and management vary and require further characterization.
Case Report (n=1)
No
Surgical resection can relieve accessory mitral valve tissue–related LVOTO; leaves open conservative management in asymptomatic cases.
Accessory mitral valve tissue is a rare anomaly of embryologic development of the endocardial cushion and may cause substantial and progressive obstruction of the left ventricular outflow tract. Subaortic obstruction resulting from accessory mitral tissue is most likely due to systolic ballooning of the tissue into the outflow tract. The obstruction can occur in the early period of life as a result of mass effect or it can develop gradually due to the continued deposition of fibrous tissues within the left ventricular outflow tract. In patients with accessory mitral valve tissue, surgery is mandatory if there is a significant obstruction in the left ventricular outflow tract. We report two cases with accessory mitral valve tissue causing mild subaortic stenoses which did not require surgery.
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Uslu et al. (2006) conducted a case report in Accessory mitral valve tissue with left ventricular outflow tract obstruction (n=1). Surgical resection of accessory mitral valve tissue and subaortic membrane was evaluated on Symptom resolution and reduction in left ventricular outflow tract peak blood flow velocity. Surgical resection of accessory mitral valve tissue successfully relieved left ventricular outflow tract obstruction, reducing peak blood flow velocity from 3.0 m/s to 1.6 m/s and resolving exertional dyspnea.
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