1. Conclusion The late efficacy of mitral annuloplasty using prosthetic ring is satisfactory.
结论对于有瓣环扩大的二尖瓣成形术，应用人工瓣环，近期和远期临床效果均满意。
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2. Aim: To assess the effect of the totally flexible prosthetic ring in mitral and tricuspid annuloplasty.
目的：评价全软成形环在二尖瓣关闭不全瓣环成形术中的作用。
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3. Purpose: To find the predictive factors of low cardiac output after mitral and aortic valve operation combined with tricuspid annuloplasty of tricuspid valve lesion.
探讨影响二尖瓣、主动脉瓣并三尖瓣病变术后低心输出量综合征（低心排）的因素以及三尖瓣的处理问题。
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4. Purpose: To find the predictive factors of low cardiac output after mitral and aortic valve operation combined with tricuspid annuloplasty of tricuspid valve lesion.
