Should Mitral Annuloplasty be Performed for Patients with Mild Ischemic Mitral Regurgitation?

Purpose: We investigated whether mitral annuloplasty (MAP) should be performed for mild ischemic mitral regurgitation (IMR). Methods: We selected 57 patients with preoperatively mild IMR. Twenty-eight patients who previously had moderate MR or more, underwent MAP (group 1) while 29 patients with persistent mild MR, did not (group 2). We reviewed MR changes and outcomes of these patients. We also investigated other IMR patients with preoperatively moderate or more MR as reference data (group 3). Results: In group 1, MR was none or trace in 25 patients immediately after operation, however, eleven out of these patients (44%) showed postoperative MR up-grade. The trends of MR changes in group 1 were similar to those of patients in group 3. In group 2, MR was graded mild in 79% of patients in mid-term postoperative stage although 28% of patients were up-graded or down-graded during postoperative follow-up. Conclusion: MAP is not necessary for patients with persistently mild IMR. Patients with preoperatively mild IMR with episodes of MR exacerbation had better be treated similarly as those with moderate or more IMR and undergo MAP.