title: Using a double-channel gastroscope reduces procedural time in performing gastric endoscopic submucosal dissection.
abstract: OBJECTIVE
  Complications are important determining factors for safety of endoscopic submucosal dissection (ESD). ESD of large lesions is associated with increased procedural time. This study investigated whether double-channel gastroscope could be used to reduce procedural time in gastric antrum ESD.
  
  
  METHODS
  A retrospective cohort study of 46 patients with one gastric antrum lesion resected by ESD was conducted between January 2013 and December 2015. The diameter of a lesion was from 2cm to 4cm in 46 patients. EUS before ESD was used to evaluate the submucosal vascular structure and the location of lesion in gastric wall. Forty six lesions had ESD with either the ordinary gastroscope (OS group) (n=24) or the double-channel gastroscope (DC group) (n=22).
  
  
  RESULTS
  The mean procedural time was significantly lower in the DC group than in the OS group (49.1 minutes vs. 20.5 minutes, p=0.04). There were no significant differences in submucosal injection frequency, specimen size, en bloc resection rate and perforation rate between the two endoscopic groups. There was no recurrence in any case during the follow-up period.
  
  
  CONCLUSIONS
  Our data suggest that ESD utilizing double-channel gastroscope may provide a better platform for quicker ESD with equal safety.
authors.affiliation: Xu Li Hua, Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing (210029), China.
authors.forename: Xu Li
authors.initials: XL
authors.lastname: Hua
authors.affiliation: Li Liang Jun, Department of Gastroenterology, Huai'an First People's Hospital, Nanjing Medical University, Huai'an (223300), China.
authors.forename: Li Liang
authors.initials: LL
authors.lastname: Jun
authors.affiliation: Zhou Chuan Wen, Department of Gastroenterology, Huai'an First People's Hospital, Nanjing Medical University, Huai'an (223300), China.
authors.forename: Zhou Chuan
authors.initials: ZC
authors.lastname: Wen
authors.affiliation: Ji Ying Lin, Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing (210029), China.
authors.forename: Ji Ying
authors.initials: JY
authors.lastname: Lin
authors.affiliation: Tian Ye, Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing (210029), China.
authors.forename: Tian
authors.initials: T
authors.lastname: Ye
authors.affiliation: Li Xue Liang, Department of Gastroenterology, The First Affiliated Hospital of Nanjing Medical University, Nanjing (210029), China.
authors.forename: Li Xue
authors.initials: LX
authors.lastname: Liang
keywords: Double-channel gastroscope; Endoscopic submucosal dissection; Endoscopic ultrasound; Gastric antrum lesion