title: The effectiveness of simethicone in improving visibility during colonoscopy when given with a sodium phosphate solution: a double-bind randomized study.
abstract: BACKGROUND
  Oral sodium phosphate solution is better tolerated than polyethylene glycol when used for colonoscopy preparation, but visibility of the lumen can be impaired because of the presence of bubbles.
  
  
  METHODS
  We studied 86 patients receiving either simethicone (n = 42) or placebo (n = 44) in addition to oral sodium phosphate to determine if simethicone improved visibility during colonoscopy. Colonoscopy was performed by a single blinded investigator. Five areas of the colon (rectosigmoid, descending, transverse, ascending, and cecum) were assessed for the presence of bubbles on withdrawal of the endoscope. Bubbles were scored as follows: 0, minimal or none; 1, covering half the lumen; 2, covering the entire circumference; 3 filling the entire lumen.
  
  
  RESULTS
  Thirteen patients in the placebo group and only one in the simethicone had significant bubbles ( > or = 1). Additionally, the mean bubble scores were greater in the placebo group in each region of the colon (p < or = 0.05 in rectosigmoid and ascending colon).
  
  
  CONCLUSIONS
  This study indicates that taking simethicone with an oral sodium phosphate preparation can improve colonic visibility by diminishing the presence of bubbles. Better visualization could improve detection of mucosal pathologic lesions.
authors.affiliation: Department of Medicine, Fitzsimons Army Medical Center, Aurora, Colorado 80045-5001, USA.
authors.forename: R H
authors.initials: RH
authors.lastname: Sudduth
authors.forename: S
authors.initials: S
authors.lastname: DeAngelis
authors.forename: K E
authors.initials: KE
authors.lastname: Sherman
authors.forename: P R
authors.initials: PR
authors.lastname: McNally
mesh_terms: D000284:Administration, Oral; D000934:Antifoaming Agents / Q000008:administration & dosage; D003113:Colonoscopy / Q000379:methods*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010710:Phosphates / Q000008:administration & dosage; D012841:Simethicone / Q000008:administration & dosage; D012996:Solutions; D007507:Therapeutic Irrigation / Q000379:methods
chemical_list: D000934:Antifoaming Agents; D010710:Phosphates; D012996:Solutions; D012841:Simethicone; C018279:sodium phosphate