主题：血管 | 医源世界 关键词】 搏动指数变化;血管内皮功能;血液透析;高频超声 [gap=1152]Key words] pulsatility index change;endothelial function;hemodialysis;high frequency ultrasound
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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).
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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