Mitral valve reconstruction: long-term results of triangular resection for degenerative prolapse.

Objectives: Surgical treatment of a prolapsed anterior leaflet of the mitral valve is relatively difficult and controversial compared with management of a prolapsed posterior leaflet. The aim of this study was to assess the long-term results of mitral valve repair, focusing on triangular resection of the anterior leaflet.

Methods: Between October 1991 and December 2006, surgical treatment for a prolapsed anterior leaflet was performed in 57 patients with degenerative mitral valve disease, including 49 patients who had anterior leaflet resection. Patients with mitral stenosis, ischemic mitral regurgitation, and congenital valvular disease were excluded. The mean age of the patients was 51.7 +/- 15.9 years, and the mean follow-up period was 6.2 +/- 3.8 years.

Results: The overall actuarial survival rate and noreoperation rate at 10 years were 91.7% +/- 4.1% and 92.3% +/- 3.7%, respectively. Reoperation was performed in 2 (4%) of 49 patients who had anterior leaflet resection. All patients survived after reoperation, which involved mitral valve replacement. Postoperative echocardiographic studies showed that the mitral valve area was significantly smaller after repair in patients with anterior leaflet resection, but the area was still large enough for a functional valve. Among the 57 patients, 42 had no mitral regurgitation, whereas it was mild in 7 patients and moderate in 3 patients.

Conclusion: Triangular resection of a prolapsed anterior leaflet of the mitral valve provides durable and reliable long-term results.