Despite significant technological progress in endoscopic imaging and device performance, the usefulness of these advances remains highly dependent on bowel preparation quality. The aim of this study was to identify predictive factors of inadequate bowel preparation

This was a prospective study conducted as part of a professional practice evaluation in the digestive endoscopy unit of the Hepato-Gastroenterology Department at Bab El Oued University Hospital, during the period from january to july 2024.Polyethylene glycol (PEG) was used as the bowel preparation agent.Preparation quality was assessed using the Boston Bowel Preparation Scale (BBPS), with inadequate preparation defined as a total score strictly below 7.Data were analyzed using SPSS v20, including univariate analyses (Chi-square test, ROC curve) and multivariate logistic regression.

A total of 227 patients were included. The mean age was 52.39 ± 18.85 years and the sex ratio was 0.91. The complete colonoscopy rate was 74.9%. A split-dose regimen was used in 77.5% of cases, and good tolerance to preparation was reported in 63% of patients.Inadequate bowel preparation was observed in 47.6% of cases.

Multivariate analysis identified three independent predictors of inadequate preparation: Constipation (OR = 0.4; p = 0.008),History of abdominal or uterine surgery (OR = 0.46; p = 0.027),Interval > 5 hours between the last PEG intake and the colonoscopy (OR = 0.4; p = 0.005)

This prospective study identified three independent predictors of inadequate bowel preparation, mainly related to patient factors: constipation, previous abdominal/uterine surgery, and a delay exceeding 5 hours between the last PEG dose and the colonoscopy. Optimizing these factors could improve preparation quality and enhance colonoscopy outcomes.