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Ann Thorac Surg 2000;69:1934-1937
© 2000 The Society of Thoracic Surgeons

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Case reports

Critical subaortic stenosis in a newborn caused by accessory mitral valve tissue

^a "Left of the Weser" Central Hospital, Bremen, Germany
^b German Heart Institute Berlin, Berlin, Germany

Address reprint requests to Dr Meyer-Hetling, Department of Thoracic, Cardiac, and Vascular Surgery, "Left of the Weser" Central Hospital, Senator Wessling Str 1, 28177 Bremen, Germany

A 2-week-old newborn girl underwent successful surgery in our clinic for critical subaortic stenosis caused by accessory mitral valve tissue, which, because of excessive growth, protruded into the left ventricular outflow tract. The preoperative pressure gradient below the aortic valve was 80 mm Hg. The operation consisted of resection of the accessory tissue through a combined aortotomy and atriotomy approach without residual pressure gradient and mitral valve incompetence. This approach is recommended to ensure that accessory tissue is removed without damaging the mitral valve.

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