The cardiac index ( CI ) and the stroke volume ( SV ) began to decrease after induction ( P0.05 or 0.01 ) while there was no significant difference for HR and Vpk in group A.
麻醉诱导后，A组心脏指数（CI）、每搏输出量（SV）开始下降，差异有统计学意义（P0.05或0.01），心率（HR）、主动脉血流峰值速度（Vpk）变化不明显；
VPK