Objective: To explore whether colloid solution 3.5%polygeline (UG) could change the effects of epidural block combined with isoflurane inhalation on systemic, pulmonary and hepatic hemodynamics.

• 目的：探讨硬膜外阻滞复合异氟醚吸入全麻对血流动力学和肝血流的影响及其静脉输入3．5%25尿素交连明胶(UG)的作用。