<qa>  What was the quality of anesthesia at the end of surgery?An anesthesiologist and a surgeon, who were blinded to the content of study drug, assessed the quality of anesthesia at the end of surgery as follows: 4: excellent, patient does not complain; 3: good, patient complains a little, no need for supplemental analgesic; 2: moderate, patient complains, need for supplemental analgesic; 1: failed, need for general anesthesia. 