title: Novel effective and repeatedly available ring-thread counter traction for safer colorectal endoscopic submucosal dissection.
abstract: Although several methods to create an effective counter traction for safer endoscopic submucosal dissection (ESD) have been reported, these methods do not overcome problems regarding delivery and ease of use. This randomized prospective study assessed the usefulness of ring-shaped thread counter traction, which not only allowed the safer colorectal ESD but also the easiest and lower cost counter traction without any special devices.
  
  
  
  Forty-five patients diagnosed with colorectal lateral spreading tumors over 20 mm were allocated to the conventional ESD group (CE) (n = 22) and the ring-shaped thread counter traction ESD group (RE) (n = 21). The ring-shaped thread was hooked and lifted up to the contralateral mucosa with a hemoclip. The primary outcome was the dissected area per minute during ESD (cm2/min) (UMIN000020160).
  
  
  
  There were significant differences in the dissection time (min), with 130.0 (56.0-240.0) versus 80 (35.0-130.0) min for the CE and RE groups, respectively (P = 0.001). For the dissected areas per minute (cm2/min), there was a significant difference, with 0.125 (0.1-0.18) versus 0.235 (0.16-0.36) min (P = 0.003) for the CE and RE groups, respectively. There were 1 cases of perforation during ESD in the CE compared to 0 for the RE, and this was no significantly different (P = 0.31). The procedure time of producing and setting the ring-shaped thread counter traction was approximately 1.80 (0.80-3.30) min only.
  
  
  
  The ring-shaped thread counter traction is simple, effective, lower cost and does not require special devices to obtain repeated counter traction.
authors.affiliation: Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan. hiro4884@med.kagawa-u.ac.jp.|Department of Gastroenterological Surgery, Ehime Rosai Hospital, Niihama, Ehime, Japan. hiro4884@med.kagawa-u.ac.jp.
authors.forename: Hirohito
authors.initials: H
authors.lastname: Mori
authors.affiliation: Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Kobara
authors.affiliation: Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan.
authors.forename: Noriko
authors.initials: N
authors.lastname: Nishiyama
authors.affiliation: Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan.
authors.forename: Shintaro
authors.initials: S
authors.lastname: Fujihara
authors.affiliation: Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan.
authors.forename: Tae
authors.initials: T
authors.lastname: Matsunaga
authors.affiliation: Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Masaki
mesh_terms: D000368:Aged; D015179:Colorectal Neoplasms / Q000601:surgery*; D000069916:Endoscopic Mucosal Resection / Q000191:economics / Q000295:instrumentation* / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D011446:Prospective Studies; D014143:Traction / Q000295:instrumentation*; D016896:Treatment Outcome
keywords: Colorectal lateral spreading tumors; Counter traction; Endoscopic submucosal dissection; Ring-shaped thread