英语语法分析

Objective: to sum up experience of heart valve replacement after closed mitral commissurotomy.

目的：介绍二尖瓣闭式扩张术后的瓣膜替换术经验。

Objective to explore new method of percutaneous balloon serious mitral stenosis commissurotomy.

目的探索重度二尖瓣狭窄球囊分离术治疗的新方法。

Objective to retrospectively review the experience of heart valve replacement after closed mitral commissurotomy in 73 cases.

目的总结73例二尖瓣闭式扩张术后的瓣膜置换术的经验。