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二级参考文献3
11.Ruvolo G，Speziale G，Bianchini R，et al.Combined coronary bypa ss grafting and mitral valve surgery：Ear lyand late results.Thorac Cardiovas Sur g，1995，43（2）：90～93.
22.Jones EL，Weintraub WS，Craver JM，e t al.Interaction of age and coronary dis easeafter valve replacement：implication s for valve selection.Ann Thorac Surg，19 94，58（2）：378～385．
33.Bauer EP，Schonburg M，Schwarz T，et al.Valve surgery combined with coronary artery operation：is the use of internal mammary artery a predictor for early complications？Eur J Cardiovas Sur g，1996，10（4）：248～252．
（1999-10-05收稿）
