Ejection fraction(EF) and cardiac output(CO) of patients in the 3 groups were evaluated before, 4 and 8 weeks after operation respectively.

分别对3组患者术前、术后4周、8周心脏射血分数（EF）及心输出量（CO）进行观察。

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We know that all patients with an ejection fraction (EF) of less that 35% are not all the same.

我们知道，射血分数(EF)小于35%的患者也是不尽相同的。

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Objective To establish an animal model of heart failure with preserved ejection fraction (EF) resulting from hypertension.

目的建立高血压病导致的射血分数正常性心力衰竭的动物模型。

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