However,there was no significant difference between group A and B.Compared with the hemodynamic parameters of group A,SV,MV,SV/DV,PI and RI of group B were obviously decreased,and DV was increased.

• 多普勒超声检测显示；B组较A组SV、MV、PI和RI显著降低(P<0.；01)；DV显著增高(P<0