title: Incidence of minor complications and time lost from normal activities after screening or surveillance colonoscopy.
abstract: BACKGROUND
  Few studies address the development of minor complications after screening or surveillance colonoscopy.
  
  
  OBJECTIVE
  Our purpose was to examine in previously asymptomatic people the incidence of new symptoms after colonoscopy, risk factors for symptoms, and patients' perceptions of this examination.
  
  
  METHODS
  Prospective cohort study. Patients completed a standardized interview at 7 and 30 days after colonoscopy.
  
  
  METHODS
  A total of 502 patients aged 40 years and older undergoing colonoscopy for colorectal cancer screening, surveillance, or follow-up of another abnormal screening test result. Patients were excluded if they had a history of inflammatory bowel disease, visible GI bleeding, or anemia.
  
  
  METHODS
  Incidence of minor complications and patient perceptions about colonoscopy.
  
  
  RESULTS
  Minor complications occurred in 162 subjects (34%) before day 7 and in 29 subjects (6%) between day 7 and day 30, most commonly bloating (25%) and abdominal pain (11%). Six subjects had unexpected emergency department visits or hospitalizations within 30 days, including 2 with postpolypectomy bleeding. On multivariate analysis, minor complications were more common in women (odds ratio 1.78, 95% CI 1.21-2.62) and when the procedure lasted 20 minutes or longer. Bowel preparation was rated the most difficult part of the examination for 77%. Most subjects (94%) lost 2 or fewer days from normal activities for the colonoscopy itself, preparation, or recovery.
  
  
  CONCLUSIONS
  Minor complications were common after screening and surveillance colonoscopy. The bowel preparation was the most difficult part of the examination for most patients. Most subjects lost 2 or fewer days from normal activities because of colonoscopy.
authors.affiliation: Department of Medicine, University of Washington, Seattle, WA 98195, USA.
authors.forename: Cynthia W
authors.initials: CW
authors.lastname: Ko
authors.forename: Stacy
authors.initials: S
authors.lastname: Riffle
authors.forename: Jean A
authors.initials: JA
authors.lastname: Shapiro
authors.forename: Michael D
authors.initials: MD
authors.lastname: Saunders
authors.forename: Scott D
authors.initials: SD
authors.lastname: Lee
authors.forename: Bruce Y
authors.initials: BY
authors.lastname: Tung
authors.forename: Rahul
authors.initials: R
authors.lastname: Kuver
authors.forename: Anne M
authors.initials: AM
authors.lastname: Larson
authors.forename: Kris V
authors.initials: KV
authors.lastname: Kowdley
authors.forename: Michael B
authors.initials: MB
authors.lastname: Kimmey
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D003113:Colonoscopy / Q000009:adverse effects*; D015179:Colorectal Neoplasms / Q000175:diagnosis; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D011183:Postoperative Complications / Q000453:epidemiology*; D011446:Prospective Studies; D012306:Risk