治疗组能显著增加心排血量和心排指数（P<0.05），对照组心排血量和心排指数无显著变化。

The heart rate, blood pressure and MPAP were not significantly Varied in both group(P<0.05).

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心排血指数（CI）及每搏输出量（SV）升高或下降不一致，但均接近正常范围。

The levels of CO, CI and SV increase or decrease were different, but all approached to normal range.

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结果：两组患者心排血量（CO）、心脏指数（CI）、每搏量（SV）和每搏指数（SI）等指标在硬膜外阻滞平面固定后均有明显下降。

Results: Cardiac Output (CO), Cardiac Index(CI), Stroke Output(SV) and Stroke index(SI) in two groups were significantly decreased when the sensory levels were finally distributed to T_6-S.

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