title: Impact of the endoscopist's experience on the negative predictive value of capsule endoscopy.
abstract: BACKGROUND
  The impact of the accumulated experience of the capsule endoscopy (CE) reader on the accuracy of this test is discussed.
  
  
  OBJECTIVE
  To determine whether the negative predictive value of CE findings changes along the learning curve.
  
  
  METHODS
  We reviewed the first 900 CE read by 3 gastroenterologists experienced in endoscopy over 8 years. These 900 CE were divided into 3 groups (300 CE each): group 1 consisted of the sum of the first 100 CE read by each of the 3 endoscopists; group 2, the sum of the second 100 and groups 3, the sum of the third 100. Patients with normal CE were monitored for at least 28 months to estimate the negative predictive value.
  
  
  RESULTS
  A total of 54 (18%) CE in group 1, 58 (19.3%) in group 2 and 47 (15.6%) in group 3 were normal, although only 34 patients in group 1, 38 in group 2 and 36 in group 3 with normal CE completed follow up and were eventually studied. The negative predictive value was 88.2% in group 1, 89.5% in group 2 and 97% in group 3 (P>.05).
  
  
  CONCLUSIONS
  The negative predictive value tended to increase, but remained high and did not change significantly after the first 100 when readers are experienced in conventional endoscopy and have preliminary specific training.
authors.affiliation: Servicio de Aparato Digestivo, Hospital Clínico de Valladolid, Valladolid, España. Electronic address: benitovelayos@hotmail.com.
authors.forename: Benito
authors.initials: B
authors.lastname: Velayos Jiménez
authors.affiliation: Servicio de Aparato Digestivo, Hospital Clínico de Valladolid, Valladolid, España.
authors.forename: Noelia
authors.initials: N
authors.lastname: Alcaide Suárez
authors.affiliation: Servicio de Aparato Digestivo, Hospital Clínico de Valladolid, Valladolid, España.
authors.forename: Guillermo
authors.initials: G
authors.lastname: González Redondo
authors.affiliation: Servicio de Aparato Digestivo, Hospital Clínico de Valladolid, Valladolid, España.
authors.forename: Luis
authors.initials: L
authors.lastname: Fernández Salazar
authors.affiliation: Servicio de Aparato Digestivo, Hospital Clínico de Valladolid, Valladolid, España.
authors.forename: Rocío
authors.initials: R
authors.lastname: Aller de la Fuente
authors.affiliation: Servicio de Aparato Digestivo, Hospital Clínico de Valladolid, Valladolid, España.
authors.forename: Lourdes
authors.initials: L
authors.lastname: Del Olmo Martínez
authors.affiliation: Servicio de Aparato Digestivo, Hospital Clínico de Valladolid, Valladolid, España.
authors.forename: Lourdes
authors.initials: L
authors.lastname: Ruiz Rebollo
authors.affiliation: Servicio de Aparato Digestivo, Hospital Clínico de Valladolid, Valladolid, España.
authors.forename: José Manuel
authors.initials: JM
authors.lastname: González Hernández
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D053704:Capsule Endoscopy; D002983:Clinical Competence; D005260:Female; D005762:Gastroenterology; D006801:Humans; D059032:Learning Curve; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D012189:Retrospective Studies; D055815:Young Adult
keywords: Capsule endoscopy; Curva de aprendizaje; Cápsula endoscópica; Entrenamiento; Hemorragia digestiva de origen oscuro; Learning curve; Lectura; Negative predictive value; Obscure gastrointestinal bleeding; Reading; Training; Valor predictivo negativo