对搏动指数（PI）和阻力指数（RI）用于评价透析血管血流动力学方面的变化作了初步分析。

The result demonstrated the accordance of this two methods. The dynamics of blood flow in hemodialysis vascularity was evaluated by pulsatility index(PI) and resistence index(RI).

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目的探讨正常双胎妊娠期间胎儿大脑中动脉搏动指数的变化；

Objective (1)To study the change of fetal middle cerebral artery pulsatility index(PIMCA) in twin pregnancy;

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目的探讨正常双胎妊娠期间胎儿大脑中动脉搏动指数的变化；

Objective (1)To study the change of fetal middle cerebral artery pulsatility index(PIMCA) in twin pregnancy;

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