title: Impact of bowel preparation on surveillance colonoscopy interval.
abstract: OBJECTIVE
  Atpresent there are no guidelines for colonoscopy surveillance interval in subjects with unsatisfactory bowel preparation. Study was designed to compare outcomes of repeat colonoscopy at different surveillance intervals in patients with unsatisfactory preparation on index exam.
  
  
  METHODS
  Ten thousand nine hundred and eight colonoscopies were done during the study period. Patients with index colonoscopy exam complete up to cecum but suboptimal bowel prep were included.
  
  
  RESULTS
  Two hundred and ninety-seven patients met the inclusion criteria. The interval for repeat colonoscopy was <1 year in 38.5%, 1-2 years in 33.3%, 2-3 years in 16.7%, and 3-5 years in 11.5% subjects. Adenoma detection rate (ADR) was 24%, high-risk adenoma detection rate (HR-ADR) was 8.4%, and colorectal cancer detection rate was 1.7%. The HR-ADR based on surveillance intervals <1 year, 1-2 years, 2-3 years, and 3-5 years was 8%, 7.9%, 2%, and 19.4%, respectively. The HR-ADR was significantly higher at surveillance interval 3-5 years (p < 0.05).
  
  
  CONCLUSIONS
  Colonoscopies repeated at interval >3 years showed a significant HR-ADR. The study indicates that a surveillance interval of 3 years can be reasonable for subjects having an index colonoscopy with suboptimal/fair/poor bowel prep and complete colon examination. Colonoscopy should be repeated earlier if symptoms develop.
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, The Brooklyn Hospital Center , Brooklyn, NY , USA.
authors.forename: Shashideep
authors.initials: S
authors.lastname: Singhal
authors.forename: Muhammad Asif
authors.initials: MA
authors.lastname: Virk
authors.forename: Mojdeh
authors.initials: M
authors.lastname: Momeni
authors.forename: Mahesh
authors.initials: M
authors.lastname: Krishnaiah
authors.forename: Sury
authors.initials: S
authors.lastname: Anand
mesh_terms: D000236:Adenoma / Q000175:diagnosis*; D000368:Aged; D000369:Aged, 80 and over; D003113:Colonoscopy / Q000379:methods*; D015179:Colorectal Neoplasms / Q000175:diagnosis*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013997:Time Factors
keywords: adenomas; bowel preparation; colorectal cancer screening; polyps; surveillance interval