Objective To observe gastric emptying after different diets on maternal who accepted analgesia in labor.Methods From October 2020 to June 2021 collected eighty primiparous women at term,with singleton pregnancies and in the cephalic presentation,voluntarily opted for epidural labor analgesia,ASA Ⅱclassification.They fasted for 6～8 hours before entering labor and refrained from drinking for 2～4 hours.Using random number assignment,the parturients were divided into the Carbohydrate Beverage(CHO)group and the control group,40 in each group.Ultrasound of the gastric antrum is performed by a trained anesthesiologist.Immediately after labor analgesia(T0),ultrasound was used to measure the baseline cross-sectional area(CSA)of the gastric antrum in the sagittal plane.Subsequently,the CHO group consumed 400 ml of carbohydrate beverage within 20 minutes,and CSA was measured at after drink CHO 30 min(T1),60 min(T2),90 min(T3),120 min(T4),150 min(T5),and 180 min(T6)until CSA≤T0.Gastric emptying was defined as CSA measurement≤T0,and carbohydrate beverage was consumed as needed until delivery was completed.The control group consumed 400 ml of nutritionally standardized noodle soup within 20 min,and CSA was measured at 30 min(T1),60 min(T2),90 min(T3),120 min(T4),150 min(T5),180 min(T6),240 min(T7),300 min(T8),and 360 min(T9).Any time point at which CSA≤T0 and solid particles were not observed in the stomach was considered as gastric emptying.Gastric volume was calculated based on CSA.The duration of labor,mode of delivery,oxytocin use,incidence of nausea and vomiting,and 1 min and 5 min Apgar scores of newborns were recorded.Results Eight cases of cesarean section and two cases of poor ultrasound image quality were excluded.The 50％gastric emptying time was 120 min in the CHO group and 360 min in the control group,with statistically significant differences(P＜0.05).At any time point from T1 to T6,gastric volume in the control group were significantly higher than those in the CHO group(P＜0.05),with statistically significant difference.There were no statistically significant differences between the two groups in terms of duration of labor,mode of delivery,oxytocin use,incidence of nausea and vomiting,and Apgar scores of newborns(P＞0.05).Conclusion Compared with consumption of noodle soup,carbohydrate beverage does not increase gastric volume in parturient receiving labor analgesia,and it has the advantages of rapid gastric emptying,low gastric residue,and no effect on duration of labor and maternal-neonatal delivery outcomes.It is safe and feasible.
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