Spinal procedure
postoperative vomiting
VASCULARIZATION
None of the patients had preoperative medication. All patients were given eight-hours routine and water fasting before surgery. On arrival in the operating room, intravenous access was opened, and cardiac monitoring and oxygen inhalation of 2–3 L/min were started prior to introduction to anesthesia. Spinal anesthesia was initiated in the left recumbent position at the L3 to L4 interspace.After confirmation of clear cerebrospinal fluid flow, 15 mg of 0.5% ropivacaine (AstraZeneca Pharmaceutical Co., Ltd., China: NAKS) was injected with 0.1 mg of morphine (Northeast Pharmaceutical Group Co., Ltd., China; Lot No.: 190306-2). After the injection, the epidural tube was placed in reserve. Five minutes later, 3 ml of 2% lidocaine was added to adjust the anesthesia level reach to T6 if the level of anesthesia did not reach T6 on the premise of no signs of lumbar anesthesia and inadvertent vascularization were observed. Supplemental oxygen was delivered through a facemask at 3.0 L/min. When systolic blood pressure is 30% lower than basal systolic blood pressure, 0.5 mg of metaraminol was administered intravenously.atropine 0.5 mg was administered for HR < 50 beats/min. 5 mg of dexamethasone (Zhengzhou Zhuofeng Pharmaceutical Co., Ltd., China; Lot No.: H41020055) and 5 mg of toltestrone (China; Lot No. H20080750) was administered intravenously to prevent postoperative vomiting after delivery of baby.