title: Frequency and efficacy of additional investigations following incomplete colonoscopies: A population-based analysis.
abstract: BACKGROUND
  Limited data are available on the follow-up of patients with incomplete colonoscopy following positive faecal occult blood testing. Our study aimed to determine the proportion of and reasons for incomplete colonoscopies, the proportion of patients who completed colonic evaluations, the methods used and the subsequent findings.
  
  
  METHODS
  A total of 9483 colonoscopies performed after positive testing in a colorectal cancer screening programme setting were included. The study was prospective for index colonoscopy findings and partly retrospective for follow-up.
  
  
  RESULTS
  Overall 297 colonoscopies were incomplete (3.2%). A secondary colonic evaluation was deemed necessary in 245 patients, of which 126 underwent an additional examination (51.4%). Radiology was the primary method used for complete colonic evaluation, whereas a repeat colonoscopy was performed in only 6.4%; the examination was normal in 119 patients (94.4%). A mucosal high-grade neoplasia was removed in 1, and multiple (≥3) adenomas were removed in 2 patients.
  
  
  CONCLUSIONS
  The present screening programme with biennial faecal occult blood testing revealed a high colonoscopy completion rate, a low rate of secondary colonic evaluation, infrequent use of colonoscopy for completion, and a low detection rate of significant neoplasia.
authors.affiliation: Gastroenterology Unit, University Hospital, CHU Rennes, France.
authors.forename: Anne-Sophie
authors.initials: AS
authors.lastname: Bollart
authors.affiliation: Gastroenterology Unit, University Hospital, CHU Rennes, France; ADECI 35, Association for the Screening of Cancers in the "Ille-et-Vilaine" Administrative Area, Rennes, France.
authors.forename: Sylvain
authors.initials: S
authors.lastname: Manfredi
authors.affiliation: ADECI 35, Association for the Screening of Cancers in the "Ille-et-Vilaine" Administrative Area, Rennes, France.
authors.forename: Christine
authors.initials: C
authors.lastname: Piette
authors.affiliation: Gastroenterology Unit, University Hospital, CHU Rennes, France; ADECI 35, Association for the Screening of Cancers in the "Ille-et-Vilaine" Administrative Area, Rennes, France. Electronic address: jean-francois.bretagne@chu-rennes.fr.
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Bretagne
mesh_terms: D000368:Aged; D001466:Barium Sulfate; D002432:Cecum; D003106:Colon / Q000033:anatomy & histology; D023881:Colonography, Computed Tomographic; D003113:Colonoscopy / Q000592:standards* / Q000706:statistics & numerical data*; D015179:Colorectal Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000601:surgery; D055088:Early Detection of Cancer / Q000592:standards*; D004733:Enema; D005260:Female; D005500:Follow-Up Studies; D005762:Gastroenterology / Q000706:statistics & numerical data*; D006801:Humans; D007441:Intubation, Gastrointestinal; D008297:Male; D008875:Middle Aged; D009780:Occult Blood; D010043:Outcome and Process Assessment, Health Care; D011446:Prospective Studies; D012189:Retrospective Studies; D012737:Sex Factors
chemical_list: D001466:Barium Sulfate
keywords: Colorectal cancer screening; Completion rate; Incomplete colonoscopy; Quality assessment