title: An Ultrathin Endoscope with a 2.4-mm Working Channel Shortens the Esophagogastroduodenoscopy Time by Shortening the Suction Time.
abstract: OBJECTIVE
  Poor suction ability through a narrow working channel prolongs esophagogastroduodenoscopy (EGD). The aim of this study was to evaluate suction with a new ultrathin endoscope (EG-580NW2; Fujifilm Corp.) having a 2.4-mm working channel in clinical practice.
  
  
  METHODS
  To evaluate in vitro suction, 200 mL water was suctioned and the suction time was measured. The clinical data of 117 patients who underwent EGD were retrospectively reviewed on the basis of recorded video, and the suction time was measured by using a stopwatch.
  
  
  RESULTS
  In vitro, the suction time with the EG-580NW2 endoscope was significantly shorter than that with the use of an ultrathin endoscope with a 2.0-mm working channel (EG-580NW; mean ± standard deviation, 22.7±1.1 seconds vs. 34.7±2.2 seconds; p<0.001). We analyzed the total time and the suction time for routine EGD in 117 patients (50 in the EG-580NW2 group and 67 in the EG-580NW group). In the EG-580NW2 group, the total time for EGD was significantly shorter than that in the EG-580NW group (275.3±42.0 seconds vs. 300.6±46.5 seconds, p=0.003). In the EG-580NW2 group, the suction time was significantly shorter than that in the EG-580NW group (19.2±7.6 seconds vs. 38.0±15.9 seconds, p<0.001).
  
  
  CONCLUSIONS
  An ultrathin endoscope with a 2.4-mm working channel considerably shortens the routine EGD time by shortening the suction time, in comparison with an endoscope with a 2.0-mm working channel.
authors.affiliation: Department of Gastroenterology, Shinozaki Medical Clinic, Tochigi, Japan ; Division of Gastroenterology, Department of Medicine, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Shinozaki
authors.affiliation: Division of Gastroenterology, Department of Medicine, Japan.
authors.forename: Yoshimasa
authors.initials: Y
authors.lastname: Miura
authors.affiliation: Division of Gastroenterology, Department of Medicine, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Ino
authors.affiliation: Department of Gastroenterology, Shinozaki Medical Clinic, Tochigi, Japan.
authors.forename: Kenjiro
authors.initials: K
authors.lastname: Shinozaki
authors.affiliation: Department of Surgery, Jichi Medical University School of Medicine, Shimotsuke, Japan.
authors.forename: Alan Kawarai
authors.initials: AK
authors.lastname: Lefor
authors.affiliation: Division of Gastroenterology, Department of Medicine, Japan.
authors.forename: Hironori
authors.initials: H
authors.lastname: Yamamoto
keywords: Diagnosis; Early detection of cancer; Endoscopes; Suction