目的观察术后硬膜外自控镇痛（PCEA）对全髋置换术患者的血液流变学的影响。
Objective To investigate the effect of postoperative patient controlled epidural analgesia(PCEA) on the hemorheology after total hip replacement surgery.
目的：观察术后病人应用硬膜外自控镇痛（PCEA）术和静脉自控镇痛（PCVA）术，对疼痛治疗的效果及副作用发生率。
Objective: Observing the effect of pain of the PCEA and PCVA easing and the rate of the side effect.
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