Isolated anterior mitral valve leaflet cleft repair with minimally invasive cardiac surgery using ORBEYE^TM

The cleft mitral valve leaflet is a common cause of congenital mitral regurgitation and is most often associated with other congenital heart defects, usually endocardial cushion defects. Cases in which cleft mitral valve leaflet is found without an associated defect are called isolated mitral valve clefts. We report a case of mitral valve repair for severe MR due to an isolated cleft with minimally invasive cardiac surgery using ORBEYE^TM in a 16-year-old male patient. Mitral regurgitation caused due to a defect in the anterior leaflet of the isolated mitral valve was observed on echocardiography. Minimally invasive cardiac surgery was performed using ORBEYE^TM, a newly developed surgical microscope, and the cleft was closed using interrupted sutures. The postoperative course was uneventful, with minimal mitral regurgitation observed. Therefore, early intervention should be considered for severe mitral regurgitation due to a mitral valve leaflet cleft.