Comparison of the Outcomes of Modified Artificial Chordae Technique for Mitral Regurgitation through Right Minithoracotomy or Median Sternotomy

Background： Right minithoracotomy （RM） has been proven to be a sate and effective approach for mitral valve surgery, but the differences of artificial chordae technique between RM and median sternotomy （MS） were seldom reported. Here, we compared the outcomes of modified artificial chordae technique for mitral regurgitation （MR） through RM or MS approaches. Methods： One hundred and eighteen consecutive adult patients who received mitral valve repair with artificial chordae and annuloplasty for MR through RM （n = 58） or MS （n = 60） from January 2006 to January 2015 were analyzed. Results： All of the selected patients underwent mitral valve repair successfully without any complication during the surgery. There was no significant difference between RM group and MS group in cardiopuhnonary bypass time, aortic cross-clamp time, and early postoperative complications. However, compared with the MS group, the RM group had shorter hospital stay and taster surgical recovery. At a mean follow-up of 44.8 ± 25.0 months, the freedom from more than moderate MR was 93.9% ± 3.5% in RM group and 94.8% ± 2.9% in MS group at 3 years postoperatively. Log-rank test showed that there was no significant difference in the freedom from recurrent significant MR between the two groups （Х^2= 0.247, P = 0.619）. Multivariate analysis revealed that the presence of mild MR at discharge was the independent risk factor for the recurrent significant MR. Conclusion： Right minithoracotomy can achieve the similar therapeutic effects with MS for the patients who received modified artificial chordae technique for treating MR.