title: Quality and effect of single dose versus split dose of polyethylene glycol bowel preparation for early-morning colonoscopy.
abstract: OBJECTIVE
  The conventional procedure of ingestion of an entire dose of polyethylene glycol solution on the day before early-morning colonoscopy may result in poor bowel preparation. The aim of this study was to evaluate the efficacy and effect of a split-dose ingestion of polyethylene glycol for early-morning colonoscopy.
  
  
  METHODS
  A total of 303 age- and sex-matched consecutive individuals presenting for medical check-ups were randomly assigned to receive either 4 L of polyethylene glycol solution with a soft diet on the day before colonoscopy (n = 152; group A), or 3 L of polyethylene glycol solution with a soft diet on the preceding day and then 1 L of the solution on the day of colonoscopy (n = 151; group B). The quality of bowel preparation was evaluated using the Ottawa scale, and the time to cecal intubation and the technical difficulty during the procedure were also recorded.
  
  
  RESULTS
  There was no difference in compliance between group A (single-dose) and group B (split-dose). The quality of bowel preparation was better in group B compared with group A. When the participants were categorized according to compliance (good compliance, 116 in group A, 119 in group B; poor compliance, 36 in group A, 32 in group B), the quality of the bowel preparation had a higher score in the good compliance compared with the poor compliance group, and in group B this difference was usually significant.
  
  
  CONCLUSIONS
  Split-dose bowel preparation with polyethylene glycol solution provided a better quality preparation than the conventional method for patients undergoing early-morning colonoscopy.
authors.affiliation: Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
authors.forename: J S
authors.initials: JS
authors.lastname: Park
authors.forename: C I
authors.initials: CI
authors.lastname: Sohn
authors.forename: S J
authors.initials: SJ
authors.lastname: Hwang
authors.forename: H S
authors.initials: HS
authors.lastname: Choi
authors.forename: J H
authors.initials: JH
authors.lastname: Park
authors.forename: H J
authors.initials: HJ
authors.lastname: Kim
authors.forename: D I
authors.initials: DI
authors.lastname: Park
authors.forename: Y K
authors.initials: YK
authors.lastname: Cho
authors.forename: W K
authors.initials: WK
authors.lastname: Jeon
authors.forename: B I
authors.initials: BI
authors.lastname: Kim
mesh_terms: D003108:Colonic Diseases / Q000175:diagnosis; D003113:Colonoscopy / Q000379:methods*; D004305:Dose-Response Relationship, Drug; D004733:Enema / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010349:Patient Compliance; D011092:Polyethylene Glycols / Q000008:administration & dosage*; D011446:Prospective Studies; D013501:Surface-Active Agents / Q000008:administration & dosage*; D013997:Time Factors
chemical_list: D013501:Surface-Active Agents; D011092:Polyethylene Glycols