title: [Surveillance colonoscopy before scheduled: is it worthwhile?].
abstract: OBJECTIVE
  To determine de incidence of colonic polyps in colonoscopies performed before scheduled and to identifY the clinical and endoscopic features that predicted this finding.
  
  
  METHODS
  All patients who underwent at least two complete colonoscopies less than three years apart were retrospectively identified in our computerized database. We excluded patients with high risk of colonic neoplasm requiring a new colonoscopy in less than three years. We analyzed the incidence of polyps before the first and third year after the first study, and the clinical and endoscopic features related to this finding by means of multivariate logistic regression.
  
  
  RESULTS
  378 paired colonoscopies fulfilled criteria, 129 were performed less than one year apart (group 1), and 249 less than three years apart (group 2). Regarding surveillance colonoscopies, 19% of patients presented adenomas and 1.5% high grade dysplasia (HGD) in group 1, and 21% presented adenomas and 2% HGD in group 2. In group 1 fair preparation (P = 0.03), and prolonged colonoscopy (P = 0.02) on the first study were independent predictors to find any polyp on the second study before scheduled. In group 2 fair cleansing (P = 0.04), history of sessile polyps (P = 0.01) and 3 or more polyps in the first study (P = 0.01) were independent predictors to find any polyp, while more than 5 polyps in the first study predicate adenomas.
  
  
  CONCLUSIONS
  During the first year incident polyps related to difficult procedures (missed polyps?) while at 3 years the history of previous polyps was also important.
authors.affiliation: Servicio de Endoscopia Digestiva, Hospital Alemán, Buenos Aires, Argentina.
authors.forename: Daniel G
authors.initials: DG
authors.lastname: Cimmino
authors.forename: Lisandro
authors.initials: L
authors.lastname: Pereyra
authors.forename: Pablo
authors.initials: P
authors.lastname: Luna
authors.forename: José M
authors.initials: JM
authors.lastname: Mella
authors.forename: Guillermo
authors.initials: G
authors.lastname: Horrisberger
authors.forename: Sandra
authors.initials: S
authors.lastname: Lencinas
authors.forename: Nicolás
authors.initials: N
authors.lastname: Rotholtz
authors.forename: Carlos
authors.initials: C
authors.lastname: Peczan
authors.forename: Silvia
authors.initials: S
authors.lastname: Pedreira
authors.forename: Luis A
authors.initials: LA
authors.lastname: Boerr
mesh_terms: D003110:Colonic Neoplasms / Q000175:diagnosis*; D003111:Colonic Polyps / Q000175:diagnosis*; D003113:Colonoscopy; D006801:Humans; D016015:Logistic Models; D008875:Middle Aged; D015999:Multivariate Analysis; D011159:Population Surveillance; D011230:Precancerous Conditions / Q000175:diagnosis; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D013997:Time Factors