title: Does Timing of Colon Procedures Affect Outcomes in D-IBS Trials?
abstract: BACKGROUND
  Sigmoidoscopy/colonoscopy is usually performed prior to enrollment into clinical trials of irritable bowel syndrome (IBS). Two main reasons are to rule out alternative diagnoses and to ensure that colitis is not present. However, the possible impact of a recent versus remote colon procedure on symptoms in IBS trials has not been evaluated. The aim of this study was to evaluate the effect of timing of colon procedures on symptoms in IBS trials.
  
  
  METHODS
  Post hoc analyses were conducted using placebo patients with diarrhea-predominant IBS in a phase 2 trial. Pain, frequency, consistency, and urgency were analyzed using repeated measures models during the first 7 days of treatment and over the entire 12-week treatment period.
  
  
  RESULTS
  Fifty-two placebo patients were grouped by whether they had a colon exam performed between screening and randomization (Group 1) or had a normal colon procedure during the 3 years prior to screening for this trial (Group 2). Average screening symptom scores were comparable between the two groups. Evaluation of various symptoms showed that there were no consistent significant differences between the two groups in pain, frequency, consistency, or urgency.
  
  
  CONCLUSIONS
  After the required 3-day post-procedure recovery period, there was no evidence that colonoscopy timing affected subsequent IBS symptoms.
authors.affiliation: RTI Health Solutions, Research Triangle Park, NC, USA.
authors.forename: Jianmin
authors.initials: J
authors.lastname: Wang
authors.affiliation: RTI Health Solutions, Research Triangle Park, NC, USA.
authors.forename: Beth
authors.initials: B
authors.lastname: Sherrill
authors.affiliation: RTI Health Solutions, Research Triangle Park, NC, USA.
authors.forename: Lynne A
authors.initials: LA
authors.lastname: Hamm
authors.affiliation: RTI Health Solutions, Research Triangle Park, NC, USA.
authors.forename: Allen W
authors.initials: AW
authors.lastname: Mangel
keywords: Colonoscopy; Diarrhea-predominant; Irritable bowel syndrome; Pain; Symptom scores; Symptoms