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Right arrow Congenital - acyanotic

Ann Thorac Surg 2002;73:274-277
© 2002 The Society of Thoracic Surgeons

Case report

Congenital mitral-aortic discontinuity

Domingo Liotta, MD*a, Armando Diluch, MDa, Adriano Malusardi, MDa, Miguel del Rio, MDa

a Dupuytren-Quilmes Private Hospital, Cardiac Surgery, Faculty of Medicine, University of Morón, Buenos Aires, Argentina

Accepted for publication March 28, 2001.

* Address reprint requests to Dr Liotta, Dupuytren-Quilmes Private Hospital, Faculty of Medicine, University of Morón, 914 Machado St, Morón, (1714) Buenos Aires, Argentina
e-mail: medicina{at}unimoron.edu.ar

Mitral-aortic (M-A) discontinuity is an uncommonly observed congenital malformation. From the embryologic point of view, it is a failure of the superior endocardial cushion of the A-V canal reach and insert into the aortic root (the mitral-aortic fibrous trigone). It should be differentiated from aorto-left ventricular discontinuity, a complication of endocarditis with excavating abscesses without boundaries. In congenital mitral-aortic discontinuity, the anterior leaflet of the mitral valve fails to insert into the aortic root. We report our experience with 2 patients. In patient 1, the severe left ventricular outflow obstruction was mainly caused by the mobile anterior leaflet of the mitral valve.






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