The Effect of Oral Gan Shuangbi During the Perinatal Period on the Recovery of Intestinal Function After Cesarean Section in Pregnant Women- A Multicenter, Double-blind, Randomized Controlled Clinical Trial

Study design and participants A total of 80 samples were obtained from pregnant individuals receiving antenatal care at the 3rd Affiliated Hospital of Sun Yat-sen University and the 1st Affiliated Hospital of Jinan University. Informed consent was obtained from pregnant women (at least 32 gestational weeks) who met the inclusion criteria. Pregnant women were followed until 7 days after cesarean section. Pregnant inclusive criteria were: 1. Chinese woman who is pregnant with a single fetus; 2. Pregnant women who planned to perform lower section of uterus due to social factors, relative head basin asymmetry, macrosomia, cicatricial uterus and other reasons. Pregnant exclusive criteria were: 1. Gastrointestinal disease or family history; 2. Antibiotic usage during pregnancy; 3. Habit of eating foods with high probiotic content such as yogurt and cheese during pregnancy; 4. Take other probiotics or probiotic drinks during pregnancy regularly; 5. Hypertension, Diabetes Mellitus, Hyperthyroidism, Hypothyroidism, Autoimmune Disease, or Other Endocrine and Metabolic Disease; 6. Transfusion History, Organ Transplantation History or Immunotherapy; 7. Gestational hypertension, gestational diabetes, gestational thyroid dysfunction and other endocrine and metabolic diseases occurred during this pregnancy.

Probiotic management In our study, forty pregnant women were randomly assigned to the probiotic group, and the rest were assigned to the control group. After enrollment, pregnant women in the probiotic group received the living Bifidobacterium longum (5 # 106 CFU) tablets produced by Neimengu Shuangqi Pharmaceutical Co., Ltd. Pregnant individuals in the probiotic group were administered four tablets three times a day (2 g/d) for seven days before surgery until the fourth day after surgery, and those in the control group took no pills.

Fecal, venous blood and data collection Fecal collection Feces from pregnant women were collected twice-the last time before surgery and the first time after surgery. Feces collected were both collected internally, thereby avoiding contamination with foreign material. The feces were transferred to the laboratory freezer at 80ºC within 30 min of collection when obtained in the hospital. Feces collected were stored in a domestic refrigerator and transferred to the laboratory freezer for 24 hours when obtained outside the hospital.

Venous blood collection Venous blood from pregnant women was collected twice-before and after surgery. The venous blood was obtained in the hospital and centrifuged within 30 minutes in a temperature-controlled centrifuge at 3000 r/min at 4℃ for 10 minutes after 2ml of which was collected, then the serum samples were transferred to the laboratory freezer at -80ºC.

Data collection Data from pregnant women was collected before and after surgery, including age, height, pre-delivery weight, time of first anal exhaust and defecation.