Two-Person Colonoscopy as a Training Approach to Non-sedation Colonoscopy

Background Reported learning curves of colonoscopy vary from 94 to 275 cases and focus on one-person colonoscopy. Our aim was to evaluate the learning curve of two-person non-sedation colonoscopy for trainees in a single tertiary care hospital. Patients and Methods We conducted a retrospective study in 1264 patients who underwent diagnostic or screening colonoscopies in a single institution from August 2012 to January 2013. Most of the patients (1174/1264) did not receive sedation during the procedure. All procedures were performed under two-person control. Two third-year residents who received previous colonoscopic training via a plastic model were the trainees. Results In comparison to the performance of 5 staff members, the colonoscopic outcomes showed no significant differences in the completion rates (77.2% vs. 79.8%, P = .382), average polyp numbers (.9 +/- 1.7 vs. 1.0 +/- 1.8, P = .453), polyp detection rates (43.5% vs. 46.3%, P = .434), or intubation lengths (96.4 +/- 29.3 vs. 96.3 +/- 26.7 cm, P = .939). The total procedure times for the 2 groups were 17.2 +/- 10.6 minutes (trainees) and 12.9 +/- 7.8 minutes (staff) (P < .001). Conclusion Trainees achieved acceptable outcomes over an 81-97 case learning curve under a two-person non-sedation colonoscopy technique, an approach with potential as a transition to single-operator colonoscopy.