title: [Impact assessment of increasing the time of withdrawal of colonoscopy in the detection rate of polyps in our midst].
abstract: BACKGROUND
  In 2002, the US Multi-Society Task Force on Colorectal Cancer recommended that the withdrawal phase during colonoscopy should average at least 6-10 min to improve the detecting ratio of polyps. However, these recommendations were based on previous studies with a high colorectal cancer-risk population. The aim of our study is to determine if the implementation of a policy of colonoscopy withdrawal time > or = 6 minutes would be statistically associated with an increase in the colon polyp detection rate.
  
  
  METHODS
  We retrospectively evaluated the procedural data from all total colonoscopies performed at our general hospital from January 2006 through July 2009. Since January 2008 we implemented the policy of withdrawal time > or = 6 minutes. We calculated the detection rate and compared data from these period with our baseline consisted of the two years previous period in which withdrawal time was not aware.
  
  
  RESULTS
  We reviewed procedural data from 2004 colonoscopies performed from January 2006 through July 2009; 1042 from the > or = 6 minutes-withdrawal time implementation period and 962 from the two years previous period. We found 162 patients with at least one polyp detected during the > or = 6 minutes-withdrawal time implementation period whereas 144 patients were detected from our baseline. The polyp detection rate was 15.55% from the period with a withdrawal time of e6 minutes versus 16.17 and 15.84% from each year of our baseline. No significant increase (p = 0.955) in the polyp detection rate was detected between the two comparative groups.
  
  
  CONCLUSIONS
  The implementation of a policy of colonoscopy withdrawal time e6 minutes had no effect on colon polyp detection.
authors.affiliation: Alumnno de la Facultad de Medicina de la Universidad Peruana Cayetano Heredia, Lima-Perú. juliovelasq@gmail.com
authors.forename: Julio
authors.initials: J
authors.lastname: Velásquez
authors.forename: Jorge
authors.initials: J
authors.lastname: Espinoza-Ríos
authors.forename: Jorge
authors.initials: J
authors.lastname: Huerta-Mercado
authors.forename: José
authors.initials: J
authors.lastname: Pinto
authors.forename: Raúl
authors.initials: R
authors.lastname: De los Ríos
authors.forename: Alejandro
authors.initials: A
authors.lastname: Piscoya
authors.forename: Carlos
authors.initials: C
authors.lastname: OR
authors.forename: Arturo
authors.initials: A
authors.lastname: Zegarra
authors.forename: Alejandro
authors.initials: A
authors.lastname: Bussalleu
mesh_terms: D003110:Colonic Neoplasms / Q000473:pathology*; D003113:Colonoscopy / Q000379:methods* / Q000592:standards*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013997:Time Factors