title: Unsedated ultrathin EGD by using a 5.2-mm-diameter videoscope: evaluation of acceptability and diagnostic accuracy.
abstract: BACKGROUND
  This study was designed to assess the acceptability and the diagnostic accuracy of unsedated ultrathin EGD (uUT-EGD) by using a newly developed 5.2-mm-diameter videoscope compared with unsedated small-caliber EGD (uSC-EGD) by using a 6.5-mm-diameter videoscope or sedated conventional EGD (sC-EGD) by using a 9.0-mm-diameter videoscope.
  
  
  METHODS
  First, 80 patients who had undergone uSC-EGD approximately 1 year earlier were randomized to receive uUT-EGD (n = 40) or uSC-EGD (n = 40). Endoscopist satisfaction and patient comfort were assessed by using a 10-cm visual analog scale. Patient comfort level was compared with that of the previous uSC-EGD. Second, 40 patients who had undergone sC-EGD within the previous 1.5 years underwent uUT-EGD. The optical quality and EGD findings of uUT-EGD were compared with those of the previous sC-EGD. Last, in the 80 patients undergoing uUT-EGD, the ability to identify a validated endoscopic marker, the rearrangement of collecting venues (RAC) pattern, for no Helicobacter pylori, was compared with the results of a (13)C-urea breath test or H pylori stool antigen test.
  
  
  METHODS
  Showa Inan General Hospital, Komagane, Japan.
  
  
  METHODS
  A total of 120 patients who undergo EGD every year as part of a gastric cancer surveillance program.
  
  
  RESULTS
  The patient comfort level of uUT-EGD was significantly better than that of uSC-EGD (P < .0001). The optical quality of the endoscopic images and the EGD findings of uUT-EGD were similar to those of the previous sC-EGD. The overall sensitivity, specificity, and accuracy of the RAC pattern in uUT-EGD in recognizing H pylori-uninfected patients were 90%, 100%, and 93%, respectively. The interobserver agreement for RAC was good (kappa = 0.42).
  
  
  CONCLUSIONS
  The use of a 5.2-mm-diameter videoscope is expected to enhance the patient acceptance of unsedated EGD.
authors.affiliation: Department of Gastroenterology, Showa Inan General Hospital, Komagane, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Horiuchi
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Nakayama
mesh_terms: D020776:Endoscopes, Gastrointestinal / Q000592:standards*; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000295:instrumentation; D008875:Middle Aged; D017060:Patient Satisfaction; D015203:Reproducibility of Results; D013274:Stomach Neoplasms / Q000175:diagnosis; D014741:Video Recording / Q000295:instrumentation*