Colon to Rectum
Clin Gastroenterol Hepatol. 2022;20(9):2023–31.e6
High-definition colonoscopy compared with cuff- and cap-assisted colonoscopy: Results from a multicenter, prospective, randomized controlled trial
Background and aims: Mucosal exposure devices including distal attachments such as the cuff and cap have shown variable results in improving adenoma detection rate (ADR) compared with high-definition white-light colonoscopy (HDWLE).
Methods: The authors performed a prospective, multicenter randomized controlled trial in patients undergoing screening or surveillance colonoscopy comparing HDWLE to 2 different types of distal attachments: cuff (CF) or cap (CP). The primary outcome was ADR. Secondary outcomes included adenomas per colonoscopy, advanced adenoma and sessile serrated lesion detection rate, right-sided ADR, withdrawal time, and adverse events. Continuous variables were compared using Student’s t test and categorical variables were compared using chi-square or Fisher’s exact test using statistical software Stata version16. A p value < 0.05 was considered significant.
Results: A total of 1203 subjects were randomized to either HDWLE (n = 384; mean 62 years of age; 81.3% males), CF (n = 379; mean 62.7 years of age; 79.9% males) or CP (n = 379; mean age 62.1 years of age; 80.5% males). No significant differences were found among 3 groups for ADR (57.3%, 59.1%, and 55.7%; p = 0.6), adenomas per colonoscopy (1.4 ± 1.9, 1.6 ± 2.4, and 1.4 ± 2; p = 0.3), advanced adenoma (7.6%, 9.2%, and 8.2%; p = 0.7), sessile serrated lesion (6.8%, 6.3%, and 5.5%; p = 0.8), or right ADR (48.2%, 49.3%, and 46.2%; p = 0.7). The number of polyps per colonoscopy were significantly higher in the CF group compared with the HDWLE and the CP group (2.7 ± 3.4, 2.3 ± 2.5, and 2.2 ± 2.3; p = 0.013). In a multivariable model, after adjusting for age, sex, body mass index, withdrawal time, and Boston Bowel Preparation Scale score, there was no impact of device type on the primary outcome of ADR (p = 0.77). In screening patients, CF resulted in more neoplasms per colonoscopy (CF: 1.7 ± 2.6, HDWLE: 1.3 ± 1.7, and CP: 1.2 ± 1.8; p = 0.047) with a shorter withdrawal time.
Conclusions: Results from this multicenter randomized controlled trial do not show any significant benefit of using either distal attachment devices (cuff or cap) over high-definition white-light colonoscopy, at least in high-detector endoscopists. The cuff may have an advantage in the screening population.