Evaluation of the effect of synbiotic on complications after gastrointestinal surgery

Intervention 1: Group A: In the intervention group, patients will receive lactocare capsules 500mg (zist takhmir pharmaceutical company) 7 days before surgery and as soon as they start oral administration after surgery until their discharge or for a maximum of one week. The drug will be prescribed twice a day after meals and oral or intravenous antibiotics should not be taken for at least 2 hours. Intervention 2: Group B: In the control group, patients will receive placebo capsules 7 days before surgery and as soon as they start oral administration after surgery until their discharge or for a maximum of one week. The drug will be prescribed twice a day after meals and oral or intravenous antibiotics should not be taken for at least 2 hours.
Primary outcome(s): Postoperative ileus. Timepoint: From the day of operation to the day of discharge. Method of measurement: The first gas passing after surgery by day.;Number of days of hospitalization after surgery. Timepoint: From the day of operation to the day of discharge. Method of measurement: By day.;Time to start oral feeding. Timepoint: From the day of operation to the day of discharge. Method of measurement: The patient’s first day of oral feeding after surgery.;Postoperative infection / Abdominal abscess / Wound infection. Timepoint: From the day of operation to the day of discharge. Method of measurement: Physical examination.;Postoperative pneumonia. Timepoint: From the day of operation to the day of discharge. Method of measurement: Clinical examination and chest radiography at the discretion of the physician.;Anastomosis leak. Timepoint: From the day of operation to the day of discharge. Method of measurement: Physical examination.;Heart failure / Kidney failure / Liver disfunction. Timepoint: From the day of operation to the day of discharge. Method of measurement: Request laboratory tests if there are clinical signs.;Nausea and vomiting. Timepoint: From the day of operation to the day of discharge. Method of measurement: Clinical examination and patient complaints.;Pain and dyspepsia. Timepoint: From the day of operation to the day of discharge. Method of measurement: Clinical examination and patient complaints.;Fever. Timepoint: From the day of operation to the day of discharge. Method of measurement: Physical examination.;Mortality in 30 days after surgery. Timepoint: From the day of surgery to 30 days after surgery. Method of measurement: Death report by physician.;SIRS. Timepoint: From the day of operation to the day of discharge. Method of measurement: Request tests if there are clinical signs.
Study Design: Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: Before assigning groups to individuals eligible to participate in the study, informed consent is completed for grouping individuals. the person who has no role in admitting patients and assigning patients to random codes preparing random sequences using online tools (https://www.sealedenvelope.com/) and by permuted block randomization method. Individualized random allocation is done in blocks with sizes 2 and 4, and without stratification. eligibility criteria are monitored by the person responsible for admitting patients. Codes in a random sequence are assigned to patients by the treatment team without knowing that each code is in the intervention or placebo group. Patient codes are then matched to randomly generated sequence information for interventions. (randomization concealment is done by the treatment team without informing the person resp