title: Colonoscope length and procedure efficiency.
abstract: OBJECTIVE
  We set out to compare the success of colonoscopy using long and intermediate length standard adult instruments.
  
  
  METHODS
  An intermediate length (133 cm working length) and long (168 cm) videocolonoscope were used on an alternate patient basis during routine endoscopy lists. Completion rates, times, and the need for external abdominal pressure were documented, as were causes of failed cecal intubation.
  
  
  RESULTS
  Among patients with no history of colon resection and with satisfactory bowel preparation, 173 procedures were performed with the intermediate and 167 with the long colonoscope. There was no significant difference in completion rates (96% for both, excluding patients with strictures), completion times (intermediate mean = 7.73 min, long = 8.11 min; p = 0.44), or need for external abdominal pressure. Similarly, no difference was observed for male and female patients analyzed separately. Though there was no significant difference in completion rates for males and females overall (99% vs 95% excluding patients with strictures, p = 0.08), the latter had significantly longer completion times (mean = 8.75 vs 6.76 min, p < 0.001) and were more likely to require external abdominal pressure. Intermediate colonoscope length was responsible for failure to reach the cecum in one patient only (0.6%).
  
  
  CONCLUSIONS
  Although the length of the intermediate instrument rarely compromises colonoscopy, it offers no significant advantage over the long scope for routine procedures.
authors.affiliation: Department of Gastroenterology, Altnagelvin Hospital, Londonderry, Northern Ireland, United Kingdom.
authors.forename: William
authors.initials: W
authors.lastname: Dickey
authors.forename: Daphne
authors.initials: D
authors.lastname: Garrett
mesh_terms: D002432:Cecum; D003110:Colonic Neoplasms / Q000175:diagnosis; D020685:Colonoscopes; D003113:Colonoscopy / Q000379:methods* / Q000706:statistics & numerical data*; D004867:Equipment Design; D004869:Equipment Safety; D005260:Female; D006801:Humans; D008297:Male; D011336:Probability; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D018709:Statistics, Nonparametric; D013997:Time Factors