title: Accuracy of transnasal endoscopy with a disposable esophagoscope compared to conventional endoscopy.
abstract: OBJECTIVE
  To assess feasibility of unsedated esophagoscopy using a small-caliber disposable transnasal esophagoscopy and to compare its accuracy with standard endoscopy.
  
  
  METHODS
  We prospectively included subjects who were referred for upper endoscopy. All subjects underwent transnasal endoscopy with E.G. Scan™. The disposable probe has a 3.6 mm gauge and at its distal end there is a 6 mm optical capsule, with a viewing angle of 125°. Patients underwent conventional endoscopy after the completion of E.G. Scan™. We describe the findings detected by the E.G. Scan™ and calculate the diagnostic accuracy, sensitivity, specificity, positive predictive value, negative predictive value and Kappa index for esophageal diagnosis.
  
  
  RESULTS
  A total of 96 patients (54 women), mean age of 50.12 years (14 to 79), were evaluated. In all cases we were able to perform esophagoscopy with E.G. Scan™. The average realization time was 5 min. A total of 58 alterations were detected in the esophagus, 49 gastric abnormalities and 13 duodenal abnormalities. We found that for esophageal varices, E.G. Scan™ has sensitivity, specificity and diagnostic accuracy of 95%, 97% and 97%, respectively. Kappa coefficients were 0.32 for hiatal hernia, 0.409 for erosive gastroesophageal reflux disease, 0.617 for Barrett's esophagus, and 0.909 for esophageal varices.
  
  
  CONCLUSIONS
  Esophagoscopy with E.G. Scan™ is a well-tolerated, fast and safe procedure. It has an appropriate diagnostic accuracy for esophageal varices when compared with conventional endoscopy.
authors.affiliation: María R Aedo, Miguel Á Zavala-González, Arturo Meixueiro-Daza, José María Remes-Troche, Laboratorio de Fisiología Digestiva y Motilidad Gastrointestinal, Instituto de Investigaciones Médico-Biológicas, Universidad Veracruzana, Veracruz 94299, México.
authors.forename: María R
authors.initials: MR
authors.lastname: Aedo
authors.affiliation: María R Aedo, Miguel Á Zavala-González, Arturo Meixueiro-Daza, José María Remes-Troche, Laboratorio de Fisiología Digestiva y Motilidad Gastrointestinal, Instituto de Investigaciones Médico-Biológicas, Universidad Veracruzana, Veracruz 94299, México.
authors.forename: Miguel Á
authors.initials: MÁ
authors.lastname: Zavala-González
authors.affiliation: María R Aedo, Miguel Á Zavala-González, Arturo Meixueiro-Daza, José María Remes-Troche, Laboratorio de Fisiología Digestiva y Motilidad Gastrointestinal, Instituto de Investigaciones Médico-Biológicas, Universidad Veracruzana, Veracruz 94299, México.
authors.forename: Arturo
authors.initials: A
authors.lastname: Meixueiro-Daza
authors.affiliation: María R Aedo, Miguel Á Zavala-González, Arturo Meixueiro-Daza, José María Remes-Troche, Laboratorio de Fisiología Digestiva y Motilidad Gastrointestinal, Instituto de Investigaciones Médico-Biológicas, Universidad Veracruzana, Veracruz 94299, México.
authors.forename: José María
authors.initials: JM
authors.lastname: Remes-Troche
keywords: Endoscopy; Esophagoscopy; Esophagus; Transnasal
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