Cardiac Index was increased in treatment groups than that in controls(P<0.05);

心搏指数与对照组比较有所增加（P<0.05）；

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Fluid responsiveness was defined as an increase in cardiac index of 15% or greater.

心脏指数增加15%或以上定义为液体反应。

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Fluid responsiveness was defined as an increase in cardiac index of 15% or greater.

心脏指数增加15%或以上定义为液体反应。

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