N. Yamamoto
University of Tokyo
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Publication
Featured researches published by N. Yamamoto.
Internal Medicine Journal | 2006
Kenji Hirano; Takao Kawabe; Yutaka Komatsu; Saburou Matsubara; Osamu Togawa; Toshihiko Arizumi; N. Yamamoto; Y. Nakai; Naoki Sasahira; Takeshi Tsujino; Nobuo Toda; Hiroyuki Isayama; Minoru Tada; Masao Omata
Autoimmune pancreatitis (AIP) has extrapancreatic complications such as Sjögrens syndrome, retroperitoneal fibrosis and sclerosing cholangitis. We studied 30 patients with AIP. Of these, we identified pulmonary involvement in four patients during follow up. Among them, two patients had respiratory failure. They showed good response to steroid therapy, but a higher dose of prednisolone was necessary to maintain remission than that required in biliary involvement. Elevation of immunoglobulin G4 and Krebs von den Lungen‐6 levels were characteristic of pulmonary involvement. They may be useful for early detection of pulmonary complication.
Journal of Gastroenterology and Hepatology | 2016
Hiroyuki Isayama; Yousuke Nakai; Rungsun Rerknimitr; Christopher Jen Lock Khor; James Y. Lau; Hsiu-Po Wang; Dong Wan Seo; Thawee Ratanachu-ek; Sundeep Lakhtakia; Tiing Leong Ang; Shomei Ryozawa; Tsuyoshi Hayashi; Hiroshi Kawakami; N. Yamamoto; Takuji Iwashita; Fumihide Itokawa; Masaki Kuwatani; Masayuki Kitano; Keiji Hanada; Hirofumi Kogure; Tsuyoshi Hamada; Ryan Ponnudurai; Jong Ho Moon; Takao Itoi; Ichiro Yasuda; Atsushi Irisawa; Iruru Maetani
Walled‐off necrosis (WON) is a relatively new term for encapsulated necrotic tissue after severe acute pancreatitis. Various terminologies such as pseudocyst, necroma, pancreatic abscess, and infected necrosis were previously used in the literature, resulting in confusion. The current and past terminologies must be reconciled to meaningfully interpret past data. Recently, endoscopic necrosectomy was introduced as a treatment option and is now preferred over surgical necrosectomy when the expertise is available. However, high‐quality evidence is still lacking, and there is no standard management strategy for WON. The consensus meeting aimed to clarify the diagnostic criteria for WON and the role of endoscopic interventions in its management. In the Consensus Conference, 27 experts from eight Asian countries took an active role and examined key clinical aspects of WON diagnosis and endoscopic management. Statements were crafted based on literature review and expert opinion, employing the modified Delphi method. All statements were substantiated by the level of evidence and the strength of the recommendation. We created 27 consensus statements for WON diagnosis and management, including details of endoscopic procedures. When there was not enough solid evidence to support the statements, this was clearly acknowledged to facilitate future research. Proposed management strategies were formulated and are illustrated using flow charts. These recommendations, which are based on the best current scientific evidence and expert opinion, will be useful for guiding endoscopic management of WON. Part 1 of this statement focused on the epidemiology, diagnosis, and timing of intervention.
Journal of Gastroenterology and Hepatology | 2016
Hiroyuki Isayama; Yousuke Nakai; Rungsun Rerknimitr; Christopher Jen Lock Khor; James Y. Lau; Hsiu-Po Wang; Dong Wan Seo; Thawee Ratanachu-ek; Sundeep Lakhtakia; Tiing Leong Ang; Shomei Ryozawa; Tsuyoshi Hayashi; Hiroshi Kawakami; N. Yamamoto; Takuji Iwashita; Fumihide Itokawa; Masaki Kuwatani; Masayuki Kitano; Keiji Hanada; Hirofumi Kogure; Tsuyoshi Hamada; Ryan Ponnudurai; Jong Ho Moon; Takao Itoi; Ichiro Yasuda; Atsushi Irisawa; Iruru Maetani
Walled‐off necrosis (WON) is a new term for encapsulated necrotic tissue after severe acute pancreatitis. Various terminologies such as pseudocyst, necroma, pancreatic abscess, and infected necrosis were previously used in the literature, resulting in confusion. The current and past terminologies must be reconciled to meaningfully interpret past data. Recently, endoscopic necrosectomy was introduced as a treatment option and is now preferred over surgical necrosectomy when the expertise is available. However, high‐quality evidence is still lacking, and there is no standard management strategy for WON. The consensus meeting aimed to clarify the diagnostic criteria for WON and the role of endoscopic interventions in its management. In the Consensus Conference, 27 experts from eight Asian countries took an active role and examined key clinical aspects of WON diagnosis and endoscopic management. Statements were crafted based on literature review and expert opinion, employing the modified Delphi method. All statements were substantiated by the level of evidence and the strength of the recommendation. We created 27 consensus statements for WON diagnosis and management, including details of endoscopic procedures. When there was not enough solid evidence to support the statements, this was clearly acknowledged to facilitate future research. Proposed management strategies were formulated and are illustrated using flow charts. These recommendations, which are based on the best current scientific evidence and expert opinion, will be useful for guiding endoscopic management of WON. Part 2 of this statement focused on the endoscopic management of WON.
Gastrointestinal Endoscopy | 2015
Yoko Abe; Hiroshi Kawakami; Koji Oba; Tsuyoshi Hayashi; Ichiro Yasuda; Tsuyoshi Mukai; Hiroyuki Isayama; Hirotoshi Ishiwatari; Shinpei Doi; Masanori Nakashima; Natsuyo Yamamoto; Masaki Kuwatani; Tomoko Mitsuhashi; Tadashi Hasegawa; Yoshinobu Hirose; Tetsuya Yamada; Mariko Tanaka; Naoya Sakamoto; H. Kawakami; Y. Abe; M. Kuwatani; Kazuteru Kawakubo; Shin Haba; Takuya Kudo; Shuhei Kawahata; Koumei Kubo; Yuki Kubota; N. Sakamoto; T. Mitsuhashi; Katsuji Marukawa
Endoscopy | 2013
N. Yamamoto; Hiroyuki Isayama; Naminatsu Takahara; Naoki Sasahira; Koji Miyabayashi; Suguru Mizuno; Kazumichi Kawakubo; Dai Mohri; Hirofumi Kogure; Takashi Sasaki; Motohisa Tada; Kazuhiko Koike
Endoscopy | 2011
Naoki Sasahira; Hiroyuki Isayama; R. Nagano; Hirofumi Kogure; K. Yamamoto; Kazumichi Kawakubo; N. Yamamoto; K. Hirano; Motohisa Tada; K. Kubota; Kazuhiko Koike
Endoscopy | 2012
Takashi Sasaki; Naminatsu Takahara; Y. Kawaguchi; H. Takao; K. Matsusaka; Koji Miyabayashi; N. Yamamoto; K. Hirano; Hiroyuki Isayama; Junichi Kaneko; Norihiro Kokudo; Kazuhiko Koike
Endoscopy | 2011
Kazumichi Kawakubo; Hiroyuki Isayama; Takeshi Tsujino; Naoki Sasahira; Y. Nakai; Hirofumi Kogure; Takashi Sasaki; N. Yamamoto; K. Hirano; Motohisa Tada; Kazuhiko Koike
Endoscopy | 2011
Kazumichi Kawakubo; Hiroyuki Isayama; Takeshi Tsujino; Y. Nakai; Naoki Sasahira; Hirofumi Kogure; Takashi Sasaki; N. Yamamoto; K. Hirano; Motohisa Tada; Kazuhiko Koike
Endoscopy | 2012
Naminatsu Takahara; Hiroyuki Isayama; Naoki Sasahira; Tsuyoshi Hamada; Rie Uchino; Suguru Mizuno; Koji Miyabayashi; Dai Mohri; Kazumichi Kawakubo; Hirofumi Kogure; Takashi Sasaki; N. Yamamoto; Y. Nakai; K. Hirano; Motohisa Tada; Kazuhiko Koike