title: [Additional polyp detection rate using colonoscopic retroflexion in right colon].
abstract: OBJECTIVE
  There have been several studies showing that retroflexion (RF) in the right colon (RC) could reduce the polyp miss rate of proximal colon during colonoscopy. This study was conducted to evaluate the additional benefit of RF technique in the RC.
  
  
  METHODS
  Patients who underwent colonoscopy from May 2008 to April 2011 were enrolled in the study. Data were obtained by retrospectively reviewing the medical records. RF was attempted in every patients undergoing colonoscopy since May 2008 except in cases of small RC vault, co-morbidity, severe diverticulosis, failed RF despite two trials, complaints of severe abdominal pain, or time burden. At first, RC was examined under direct vision. It was then examined by RF to detect missed polyps during the initial observation. Finally, the RC was re-examined with direct view.
  
  
  RESULTS
  The cumulative RF success rate in the RC was 78.84% (1,805 of 2,319). The RF success rate increased with the number of cases (50% at 160 cases, 70% at 400 cases, and reached near 90% over 1,000 cases). Few polyps (4.88%) were detected only with RF and the additional adenoma detection rate was 3.32%. The additional polyp/adenoma detection rates were higher in the old age group (p<0.01). There were no RF associated perforation or severe complication.
  
  
  CONCLUSIONS
  Using RF examination, additional 4.88% of polyps could be detected in the RC. This technique could be a useful and safe method to detect hidden polyp during colonoscopy.
authors.affiliation: Department of Internal Medicine, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Heung Up
authors.initials: HU
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Sun Jin
authors.initials: SJ
authors.lastname: Boo
authors.affiliation: Department of Internal Medicine, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Soo Young
authors.initials: SY
authors.lastname: Na
authors.affiliation: Department of Internal Medicine, Jeju National University School of Medicine, Jeju, Korea.
authors.forename: Hyun Joo
authors.initials: HJ
authors.lastname: Song
mesh_terms: D000236:Adenoma / Q000175:diagnosis / Q000473:pathology; D000328:Adult; D000368:Aged; D044683:Colon, Descending / Q000473:pathology; D003110:Colonic Neoplasms / Q000175:diagnosis / Q000473:pathology; D003111:Colonic Polyps / Q000175:diagnosis*; D003113:Colonoscopy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies