There is high incidence of hemodynamic instability in patients undergoing hepatectomy with low central venous pressure, especially in general anesthesia combined with epidural anesthesia. Remazolam, a new benzodiazepine, has no significant cardiovascular inhibitory effect. Investigators hypothesis that remazolam will provide better hemodynamic when compared with propofol in patients undergoing hepatectomy with general anesthesia combined with epidural anesthesia.
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Hemodynamic instability score
Timeframe: intraoperative