A prospective comparison of live and video-based assessments of colonoscopy performance

Colonoscopy performance is typically assessed by a supervisor in the clinical setting. There are limitations of this approach, however, because it allows for rater bias and increases supervisor workload demand during the procedure. Video-based assessment of recorded procedures has been proposed as a complementary means by which to assess colonoscopy performance. This study sought to investigate the reliability, validity, and feasibility of video-based assessments of competence in performing colonoscopy compared with live assessment.Novice (50 previous colonoscopies), intermediate (50-500), and experienced (1000) endoscopists from 5 hospitals participated. Two views of each colonoscopy were videotaped: an endoscopic (intraluminal) view and a recording of the endoscopist's hand movements. Recorded procedures were independently assessed by 2 blinded experts using the Gastrointestinal Endoscopy Competency Assessment Tool (GiECAT), a validated procedure-specific assessment tool comprising a global rating scale (GRS) and checklist (CL). Live ratings were conducted by a non-blinded expert endoscopist. Outcomes included agreement between live and blinded video-based ratings of clinical colonoscopies, intra-rater reliability, inter-rater reliability and discriminative validity of video-based assessments, and perceived ease of assessment.Forty endoscopists participated (20 novices, 10 intermediates, and 10 experienced). There was good agreement between the live and video-based ratings (total, intra-class correlation [ICC] = 0.847; GRS, ICC = 0.868; CL, ICC = 0.749). Intra-rater reliability was excellent (total, ICC = 0.99; GRS, ICC = 0.99; CL, ICC = 0.98). Inter-rater reliability between the 2 blinded video-based raters was high (total, ICC = 0.91; GRS, ICC = 0.918; CL, ICC = 0.862). GiECAT total, GRS, and CL scores differed significantly among novice, intermediate, and experienced endoscopists (P .001). Video-based assessments were perceived as "fairly easy," although live assessments were rated as significantly easier (P .001).Video-based assessments of colonoscopy procedures using the GiECAT have strong evidence of reliability and validity. In addition, assessments using videos were feasible, although live assessments were easier.