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The extent of papillary muscle approximation affects mortality and durability of mitral valve repair for ischemic mitral regurgitation

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Title: The extent of papillary muscle approximation affects mortality and durability of mitral valve repair for ischemic mitral regurgitation
Authors: Wakasa, Satoru Browse this author →KAKEN DB
Kubota, Suguru Browse this author
Shingu, Yasushige Browse this author
Ooka, Tomonori Browse this author
Tachibana, Tsuyoshi Browse this author
Matsui, Yoshiro Browse this author →KAKEN DB
Keywords: Cardiomyopathy
Ischemic heart disease
Mitral valve
Issue Date: 3-Jun-2014
Publisher: Biomed Central Ltd
Journal Title: Journal of Cardiothoracic Surgery
Volume: 9
Issue: 1
Start Page: 98
Publisher DOI: 10.1186/1749-8090-9-98
PMID: 24893928
Abstract: Background: Since reduction annuloplasty alone for ischemic mitral regurgitation (MR) cannot prevent late recurrence of MR or improve survival for those with left ventricular (LV) dysfunction, and the surgical approach to this etiology is still controversial, we conducted a study to assess the efficacy of the additional papillary muscle approximation (PMA) procedure for ischemic MR by comparing the different subtypes of PMA. Methods: We studied 45 patients who underwent mitral annuloplasty and papillary muscle approximation (PMA) for ischemic MR between 2003 and 2012. Papillary muscles were approximated entirely (cPMA: complete PMA, n = 32) through an LV incision or partially from the tips to mid-parts (iPMA: incomplete PMA, n = 13) through the mitral and aortic valves. Twenty-three patients with cPMA also underwent LV plasty (LVP). We assessed the outcomes after PMA by comparing cPMA and iPMA. Results: The baseline MR grade, NYHA class, LV end-diastolic diameter, and LV ejection fraction (LVEF) were 2.8 +/- 1.0, 3.2 +/- 0.6, 67 +/- 6 mm, and 30 +/- 10%, respectively. There were no significant differences in these parameters among those with iPMA, cPMA/LVP-, and cPMA/LVP+, though iPMA patients had better LVEF than others. Three patients died before discharge and 12 died during the follow-up. Recurrence of grade 2+ and 3+ MR occurred in 8 and 2 patients, respectively. Reoperation for recurrent MR was performed only for the 2 patients with recurrence of grade 3+ MR. The cPMA was associated with lower mortality (log-rank P = 0.020) and a lower rate of recurrence of MR >= 2+ (log-rank P = 0.005) than iPMA. In contrast, there were no significant differences in the mortality (log-rank P = 0.45) and rate of recurrence (log-rank P = 0.98) between those with cPMA/LVP- and cPMA/LVP+. The 4-year survival rate and rate of freedom from recurrence of MR >= 2+ were 83% and 85% for those with cPMA, repectively. In contrast, the rates were 48% and 48% for those with iPMA, respectively. Conclusions: Complete PMA could be associated with lower postoperative mortality and higher durability of mitral valve repair for ischemic MR.
Type: article
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松居 喜郎

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