UK IBD Surveillance: Procedure Time and Polyp Detection

Key Takeaways

• In UK IBD surveillance colonoscopies, cecal intubation reached 96.1% and median withdrawal time was 13 minutes.
• Endoscopists performing IBD surveillance at least monthly represented 18.9% of operators and delivered 57.1% of surveillance examinations.
• Monthly IBD surveillance practice and extended allocated examination time were each associated with higher adjusted polyp detection.
• Polyp detection served as a surrogate for mucosal inspection quality, not a measure of confirmed dysplasia.

For people with inflammatory bowel disease (IBD), how do the circumstances of colorectal cancer surveillance colonoscopy relate to mucosal inspection? Endoscopist surveillance frequency and allotted examination time may relate to detection, but procedural measures and lesion detection capture different aspects of quality. Investigators assessed these relationships in recorded UK examinations.

Investigators analyzed an observational cohort of all 588,841 colonoscopies uploaded to the UK National Endoscopy Database from January 1 through December 31, 2024. In the Journal of Crohn's and Colitis study of UK IBD surveillance quality, they identified IBD procedures from recorded indications and classified them as assessment or surveillance. They compared key performance indicators with national guidance and used case-mix-adjusted multilevel mixed-effects logistic regression to examine endoscopist- and service-level factors. Operator frequency and allocated procedure time were observed characteristics, not assigned interventions.

Among the recorded procedures, 15,971 (2.7%) were classified as IBD surveillance. More than half of endoscopists performed at least one such examination, but surveillance work was concentrated among those who performed it regularly. Adequate bowel preparation was 80.2%, below the national target; cecal intubation and withdrawal time provided additional measures of procedural performance.

After case-mix adjustment, endoscopists performing IBD surveillance at least monthly had higher odds of polyp detection (odds ratio [OR] 1.26). Extended allocated procedure time was also associated with higher detection (OR 1.40). These were associations with a detection measure, not estimates of how many additional lesions were found.

These observational associations do not establish that increasing operator surveillance frequency or extending allocated time would improve histologically confirmed dysplasia detection or prevent colorectal cancer. Polyp detection reflects mucosal inspection rather than a confirmed dysplasia outcome. The authors also discussed consistent use and documentation of dye-based chromoendoscopy in connection with higher polyp detection, without a separately quantified dye-specific association.

The authors called for further work to determine whether concentrating IBD surveillance services or setting minimum operator volumes improves dysplasia-related outcomes.

Clinician Questions

Do adjusted polyp-detection odds ratios in UK IBD surveillance show how many additional polyps were found?

No. The UK IBD surveillance colonoscopy analysis reported adjusted associations for monthly endoscopist surveillance and extended allocated procedure time, but the available study abstract provides no baseline polyp-detection rates or absolute differences. Those odds ratios cannot quantify additional polyps detected or demonstrate a causal benefit.

What service pathway did the authors discuss for UK IBD colorectal cancer surveillance?

The authors raised pathways analogous to English Bowel Cancer Screening, with national standards and performance monitoring, as a possibility for UK IBD colorectal cancer surveillance. They did not describe an implemented pathway or demonstrate improved dysplasia or cancer outcomes from that model.

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