Withdrawal Time of Colonoscopy and Detection Rate of Colorectal Polyps: A Retrospective Study / 胃肠病学

ABSTRACT

Background: Colonoscopy is an important approach for the screening of colorectal cancer, however, the quality of colonoscopy is affected by a series of factors such as withdrawal time and bowel cleanliness. It is recommended that colonoscopy withdrawal time should not be less than 6 minutes. Aims: To study the relationship between withdrawal time of colonoscopy and the detection rate of colorectal polyps, which is considered as an important quality indicator for colonoscopy. Methods: A total of 2 924 cases of patients who underwent colonoscopy at the Southern Division of Shanghai Renji Hospital from September 2018 to September 2019 were enrolled in this retrospective study. Colonoscopies were performed by two experienced senior endoscopists. Patients were divided into two groups according to the presence of colorectal polyps. The gender, age, cecal insertion time, depth of insertion and withdrawal time were recorded and compared between the two groups. The influential factors for detection of colorectal polyps were analyzed by logistic regression model. Results: Of the 2 924 cases, 1 105 (37.8%) found polyps under colonoscopy. There were significant differences in gender and cecal insertion time between the two groups (P<0.05). Logistic regression analysis revealed that male (OR=3.175, 95% CI 1.596-6.317, P=0.001) and withdrawal time ≥ 5 min (OR=4.945, 95% CI 2.037-12.005, P<0.001) were associated with detection of colorectal polyps. Conclusions: For experienced senior endoscopists, the risk-benefit balance might be achieved by controlling the colonoscopy withdrawal time within 5-6 minutes.