Running Title:
Shorten anesthesia time
Correspondence: Address correspondence to Dr. Wu: Department of Geratic Surgery, Xiangya Hospital, Central South University, 78 Xiangya road, Changsha, China, 410008. wwtw1972@126.com.
or
Dr. He: Operating Room, Xiangya Hospital, Central South University, 78 Xiangya road, Changsha, China, 410008. cshejiqun@126.com