Group-P: (Propofol group): 3 mg kg-1 min-1 propofol was pumped continuously after endotracheal intubation. Group-PAS: (Propofol and after 20 min adding Sevoflurane group): 3 mg kg-1 min-1 propofol were pumped continuously and add 1% end-tidal sevoflurane 20 minutes after endotracheal intubation. Group-PS: (Propofol and Sevoflurane group): 3 mg kg-1 min-1 propofol were continuously pumped after endotracheal intubation, and 1% sevoflurane was inhaled continuously at the same time. Group-S: (Sevoflurane group): 1% sevoflurane continued to maintain anesthesia after endotracheal intubation. Group-PSu: (Propofol and Sufentanil group): 3 mg kg-1 min-1 propofol, 0.01 μ g kg-1 min-1 sufentanil were pumped continuously at maintain phase. Due to the ethical requirements of adequent analgesia, 0.3 μ g kg-1 min-1 remifentanil was continuously pumped as background input dose during anesthesia maintenance in all groups.
This prospective open-label randomized study, patients were having elective urological surgery scheduled to last longer than 1 h under necessitating general anesthesia.Group-P: (Propofol group): 3 mg kg-1 min-1 propofol was pumped continuously after endotracheal intubation. Group-PAS: (Propofol and after 20 min adding Sevoflurane group): 3 mg kg-1 min-1 propofol were pumped continuously and add 1% end-tidal sevoflurane 20 minutes after endotracheal intubation. Group-PS: (Propofol and Sevoflurane group): 3 mg kg-1 min-1 propofol were continuously pumped after endotracheal intubation, and 1% sevoflurane was inhaled continuously at the same time. Group-S: (Sevoflurane group): 1% sevoflurane continued to maintain anesthesia after endotracheal intubation. Group-PSu: (Propofol and Sufentanil group): 3 mg kg-1 min-1 propofol, 0.01 μ g kg-1 min-1 sufentanil were pumped continuously at maintain phase