Objective To explore the effect of the group standard "TSHNA 0003-2023 Digestive Endoscopy Preoperative Gastrointestinal Preparation" on improving the adequacy rate of bowel preparation for colonoscopy in outpatients.

Methods Patients who underwent colonoscopy diagnosis and treatment at the Endoscopy Center of Minhang Hospital Affiliated to Fudan University in Shanghai from June to September 2024 were selected.Those who underwent standard procedures before and after the intervention were assigned to the control group and the intervention group, respectively, with further analysis conducted using random sampling.The control group followed the conventional colonoscopy bowel preparation protocol, patients were informed about the method of taking bowel preparation before the examination and provided with written instructions.The intervention group received personalized interventions based on the group standard, including baseline assessment, dietary guidance, medication guidance, and measures for preventing and managing adverse reactions.Bowel preparation was assessed using the Boston bowel preparation scale (BBPS) (score ≥6 points was considered adequate).The improvement in BBPS scores in the intervention group was evaluated using a linear regression model.The occurrence of edverse reactions and patients′ satisfaction were compared.

Results A total of 1 198 outpatients undergoing colonoscopy were included in the analysis, comprising 598 in the control group and 600 in the intervention group.The bowel preparation adequacy rate was significantly higher in the intervention group compared to the control group (88.33% vs 82.61%, P < 0.01).After adjusting for confounding factors, the intervention group demonstrated a 1.78-point improvement in Boston scores over the control group (P < 0.01).The intervention strategy primarily enhanced Boston scores in patients using sodium phosphate, magnesium sulfate with sodium potassium, or magnesium sulfate as bowel-cleansing agents, while also significantly reducing the incidence of adverse reactions compared to the control group (P < 0.01).Additionally, the intervention strategy significantly improved the detection rate of colonic lesions and patients′ satisfaction (P < 0.05 and P < 0.01).

Conclusions The individualized bowel preparation intervention strategy based on the TSHNA 0003-2023 group standard effectively improves the adequacy rate of bowel preparation for colonoscopy in outpatinents, reduces the incidence of adverse reactions, increases the detection rate of lesions, and enhances patients′ satisfaction.The strategy demonstrates significant clinical benefits and is worthy of widespread application and promotion.