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Mitral Valve Repair for Extended Commissural Prolapse Involving Complex Prolapse

Department of Cardiovascular Surgery, Yamanashi Central Hospital, Yamanashi, Japan

For reprint information contact: Hironobu Morimoto, MD Tel: 81 3 3353 8111 Fax: 81 3 3356 0441 Email: hironobu12jp{at}yahoo.co.jp, Department of Cardiovascular Surgery, The Heart Institute of Japan, Tokyo Women’s Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan.

We reviewed our experience of mitral valve repair techniques for extended commissural prolapse involving complex prolapse of either or both leaflets, due to chordal rupture or elongation. Between June 1991 and January 2005, 21 of 210 patients who underwent mitral valve repair for mitral regurgitation had extended commissural prolapse involving either or both of the anterior and posterior leaflets. There were 17 (81%) patients with degenerative and 4 (19%) with infective endocarditis. The distribution of diseased mitral commissural lesions was: posteromedial commissure in 14 (67%) patients, anterolateral in 6 (29%), and bilateral in 1 (5%). Reconstructive techniques included leaflet folding plasty in 10, resection-suture in 6, the sliding technique in 2, commissuroplasty in 2, and chordal shortening in 1. There were no perioperative deaths; postoperative mitral regurgitation was none or trivial in 19 patients and mild in 2. The mean follow-up period was 54 months (range, 2–155 months), and no patient required re-operation. There was one late death from a noncardiac cause at 103 months. Mitral valve repair for extended commissural prolapse is satisfactory. We consider leaflet folding plasty and its modification to be effective in patients who require extensive leaflet resection in the commissural area.