Impact of a computer-based teaching module on characterization of diminutive colon polyps by using narrow-band imaging by non-experts in academic and community practice: a video-based study

Gastrointest Endosc. 2014 Mar;79(3):390-8. doi: 10.1016/j.gie.2013.07.032. Epub 2013 Sep 8.


Background: Experts can accurately characterize the histology of diminutive polyps with narrow-band imaging (NBI). There are limited data on the performance of non-experts.

Objective: To assess the impact of a computer-based teaching module on the accuracy of predicting polyp histology with NBI by non-experts (in academics and community practice) by using video clips.

Design: Prospective, observational study.

Setting: Academic and community practice.

Participants: A total of 15 gastroenterologists participated-5 experts in NBI, 5 non-experts in academic practice, and 5 non-experts in community practice.

Intervention: Participants reviewed a 20-minute, computer-based teaching module outlining the different NBI features for hyperplastic and adenomatous polyps.

Main outcome measurements: Performance characteristics in characterizing the histology of diminutive polyps with NBI by using short video clips before (pretest) and after (posttest) reviewing the teaching module.

Results: Non-experts in academic practice showed a significant improvement in the sensitivity (54% vs 79%; P < .001), accuracy (64% vs 81%; P < .001), and proportion of high-confidence diagnoses (49% vs 69%; P < .001) in the posttest. Non-experts in community practice had significantly higher sensitivity (58% vs 75%; P = .004), specificity (76% vs 90%; P = .04), accuracy (64% vs 81%; P < .001), and proportion of high-confidence diagnoses (49% vs 72%; P < .001) in the posttest. Performance of experts in NBI was significantly better than non-experts in both academic and community practice.

Limitations: Selection bias in selecting good quality videos. Performance not assessed during live colonoscopy.

Conclusion: Academic and community gastroenterologists without prior experience in NBI can achieve significant improvements in characterizing diminutive polyp histology after a brief computer-based training. The durability of these results and applicability in everyday practice are uncertain.

Publication types

  • Observational Study

MeSH terms

  • Academic Medical Centers
  • Clinical Competence*
  • Colonic Polyps / pathology*
  • Community Health Centers
  • Computer-Assisted Instruction*
  • Education, Medical, Continuing / methods*
  • Gastroenterology / education*
  • Humans
  • Narrow Band Imaging*
  • Professional Practice Location
  • Prospective Studies
  • Sensitivity and Specificity