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Ann Thorac Surg 2002;74:1468-1475
© 2002 The Society of Thoracic Surgeons

Original article: cardiovascular

Can late survival of patients with moderate ischemic mitral regurgitation be impacted by intervention on the valve?

Kevin M. Harris, MDa, Thoralf M. Sundt, III, MDb*, Dorothy Aeppli, PhDa, Rajesh Sharma, MDc, Benico Barzilai, MDc

a The Minneapolis Heart Institute, Minneapolis, Minnesota, USA
b Mayo Clinic, Rochester, Minnesota, USA
c Washington University School of Medicine, St. Louis, Missouri, USA

Accepted for publication June 17, 2002.

* Address reprint requests to Dr Sundt, Mayo Clinic, 200 First St, SW, Rochester, MN, 55905, USA.
e-mail: sundt.thoralf{at}mayo.edu

BACKGROUND: Ischemic mitral regurgitation is known to be associated with poor long-term outcome after coronary artery bypass grafting; however, our ability to alter that outcome with intervention on the valve is unclear. The decision to address the valve is most challenging for patients with only moderate mitral regurgitation, particularly with the popularization of off-pump surgery. We therefore reviewed early and late outcomes of patients undergoing revascularization with or without mitral valve surgery.

METHODS: Patients with moderate mitral regurgitation undergoing revascularization with and without mitral surgery between January 1991 and September 1996 were identified retrospectively. Operative notes were reviewed and patients with structural valve disease excluded. Perioperative events and late outcomes as determined by telephone contact and search of the social security death index (survival data 97% complete) were compared.

RESULTS: One hundred seventy-six patients with moderate mitral regurgitation underwent revascularization alone (n = 142) or with mitral repair or replacement (n = 34). Those undergoing revascularization alone had a higher serum creatinine, somewhat less mitral regurgitation, and lower New York Heart Association functional class preoperatively. Operative mortality was greater with valve surgery (21% vs 9%, p = 0.047). Actuarial survival of both groups at 5 years was similar (52% vs 58%, p = NS); however, when stratified by preoperative functional class, those with more advanced heart failure preoperatively had superior late survival if their mitral valve was intervened upon.

CONCLUSIONS: The late survival of patients with ischemic mitral regurgitation undergoing coronary revascularization remains poor; however, intervention on the mitral valve appears to benefit those with symptomatic heart failure.




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