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Featured researches published by N. Yamamoto.


Internal Medicine Journal | 2006

High‐rate pulmonary involvement in autoimmune pancreatitis

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

Asian consensus statements on endoscopic management of walled-off necrosis Part 1: Epidemiology, diagnosis, and treatment.

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

Asian consensus statements on endoscopic management of walled-off necrosis. Part 2: Endoscopic management.

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

Effect of a stylet on a histological specimen in EUS-guided fine-needle tissue acquisition by using 22-gauge needles: a multicenter, prospective, randomized, controlled trial.

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

Percutaneous direct-endoscopic necrosectomy for walled-off pancreatic necrosis

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

Noncalcified pancreatic stone treated with electrohydraulic lithotripsy using SpyGlass pancreatoscopy.

Naoki Sasahira; Hiroyuki Isayama; R. Nagano; Hirofumi Kogure; K. Yamamoto; Kazumichi Kawakubo; N. Yamamoto; K. Hirano; Motohisa Tada; K. Kubota; Kazuhiko Koike


Endoscopy | 2012

Biliary tumor thrombus of hepatocellular carcinoma containing lipiodol mimicking a calcified bile duct stone

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

Endoscopic retrieval of a migrated stent after endoscopic ultrasound-guided choledochoduodenostomy

Kazumichi Kawakubo; Hiroyuki Isayama; Takeshi Tsujino; Naoki Sasahira; Y. Nakai; Hirofumi Kogure; Takashi Sasaki; N. Yamamoto; K. Hirano; Motohisa Tada; Kazuhiko Koike


Endoscopy | 2011

Peroral cholangioscopy in a patient with a Billroth II gastrectomy using the SpyGlass Direct Visualization System.

Kazumichi Kawakubo; Hiroyuki Isayama; Takeshi Tsujino; Y. Nakai; Naoki Sasahira; Hirofumi Kogure; Takashi Sasaki; N. Yamamoto; K. Hirano; Motohisa Tada; Kazuhiko Koike


Endoscopy | 2012

Endoscopic removal of a piece of retained pancreatic stent with a novel new technique: turned guide-wire looping method.

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

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