Naoki Chiba

ORCID: 0009-0003-0296-9026
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About
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Research Areas
  • Helicobacter pylori-related gastroenterology studies
  • Gastroesophageal reflux and treatments
  • Eosinophilic Esophagitis
  • Gastrointestinal motility and disorders
  • Gastric Cancer Management and Outcomes
  • Microscopic Colitis
  • Radical Photochemical Reactions
  • Oxidative Organic Chemistry Reactions
  • Gastrointestinal disorders and treatments
  • Esophageal and GI Pathology
  • Colorectal Cancer Screening and Detection
  • Veterinary medicine and infectious diseases
  • Gastrointestinal Bleeding Diagnosis and Treatment
  • Glaucoma and retinal disorders
  • Inflammatory Bowel Disease
  • Esophageal Cancer Research and Treatment
  • Plant Virus Research Studies
  • Retinal Diseases and Treatments
  • Pulmonary Hypertension Research and Treatments
  • Cardiac Imaging and Diagnostics
  • Atrial Fibrillation Management and Outcomes
  • Legume Nitrogen Fixing Symbiosis
  • Microbial Natural Products and Biosynthesis
  • Organic Chemistry Cycloaddition Reactions
  • Fluorine in Organic Chemistry

Dokkyo Medical University
2025

Tohoku University
1991-2024

National Institute for Materials Science
2022-2024

The University of Tokyo
1989-2024

Miyagi Prefectural Hospital Organization
2021-2022

McMaster University
2005-2019

Guelph General Hospital
1998-2016

QB3
2012

University of California, Berkeley
2012

Joint BioEnergy Institute
2012

Eradication of Helicobacter pylori provides potential cure in the majority patients with peptic ulcer disease, and eradication rates more than 90% have been reported, using omeprazole combination two antimicrobials. The choice antimicrobials, dose regimen duration treatment varied between studies, however, an optimal still has to be established.We conducted international, randomized, double-blind, placebo-controlled study involving 100 each six groups 43 hospital gastrointestinal units...

10.1111/j.1523-5378.1996.tb00027.x article EN Helicobacter 1996-09-01

OBJECTIVES From the Canadian Registry of patients with Upper Gastrointestinal Bleeding and Endoscopy (RUGBE), we determined clinical outcomes explored roles endoscopic pharmacologic therapies in a contemporary real-life setting. METHODS Analysis randomly selected endoscoped for nonvariceal upper gastrointestinal bleeding at 18 community tertiary care institutions between 1999 2002. Covariates were defined priori 30-day follow-up obtained. Logistic regression models identified predictors...

10.1111/j.1572-0241.2004.30272.x article EN The American Journal of Gastroenterology 2004-07-01
Miguel Regueiro Brian G. Feagan Bin Zou Jewel Johanns Marion Blank and 95 more Marc Chévrier Scott E. Plevy John Popp Freddy Cornillie Milan Lukáš Silvio Danese Paolo Gionchetti Stephen B. Hanauer Walter Reinisch William J. Sandborn Dario Sorrentino Paul Rutgeerts Henry Debinski Tim Florin David J. Hetzel Ian C. Lawrance G. Radford‐Smith Andrew Sloss Dario Sorrentino S Gassner T Haas G Reicht Walter Reinisch Michael Straßer Harald Vogelsang Peter Bossuyt Olivier Dewit Geert R. D’Haens Denis Franchimont Édouard Louis Séverine Vermeire Çharles N. Bernstein Raymond Bourdages Naoki Chiba Sonny S. Dhalla Brian G. Feagan Richard N. Fedorak Jean-René Lachance Remo Panaccione Mark J. Ropeleski B Salh Milan Lukáš J.F. Colombel Matthieu Allez Pierre Desreumaux Jean Louis Dupas J.C. Grimaud Xavier Hébuterne David Laharie Éric Lerebours Laurent Peyrin‐Biroulet J.M. Reimund Stéphanie Viennot Frank Zerbib Castells Antoni Raja Atreya Daniel C. Baumgart Christoph Berg Ulrich Boecker G. Bramkamp C. Bünning Robert Ehehalt S Howaldt Torsten Kucharzik Hein Lamprecht Jonas Mudter J. Preiß Stefan Schreiber Ursula Seidler I Altorjay János Banai Péter L. Lakatos Márta Varga Áron Vincze Irit Avni‐Biron Sigal Fishman Gerald Fraser Ehud Goldin Daniel Rachmilewitz Vito Annese Sandro Ardizzone Livia Biancone Fabrizio Bossa Silvio Danese Walter Fries Paolo Gionchetti Giovanni Maconi Giovanni Terrosu P. Usai Geert R. D’Haens Richard B. Gearry Jeffrey Hill David Rowbotham Michael Schultz R.S. Stubbs

Background & AimsMost patients with Crohn's disease (CD) eventually require an intestinal resection. However, CD frequently recurs after We performed a randomized trial to compare the ability of infliximab vs placebo prevent recurrence.MethodsWe evaluated efficacy in preventing postoperative recurrence 297 at 104 sites worldwide from November 2010 through May 2012. All study had undergone ileocolonic resection within 45 days before randomization. Patients were randomly assigned (1:1) groups...

10.1053/j.gastro.2016.02.072 article EN cc-by-nc-nd Gastroenterology 2016-03-03

To develop a disease-specific QOL instrument (QOLRAD) addressing patient concerns in gastroesophageal reflux disease (GERD) and dyspepsia. Patients. 759 male (45%) female (55%) patients with mean age of 48.4 years (sd 15.2) were used the psychometric evaluation.A pilot version QOLRAD, Gastrointestinal Symptoms Rating Scale (GSRS) SF-36 completed prior to endoscopy. Items high ceiling effect, items measuring different construct, i.e. low squared multiple correlation (R < 0.5) other items,...

10.1080/11024159850191238 article EN The European Journal of Surgery 1998-12-31

Summary Background: Uninvestigated dyspepsia is common in family practice. The prevalence of clinically significant upper gastrointestinal findings (CSFs) adult uninvestigated patients, and their predictability based on history, unknown. Methods: Prompt endoscopy was performed within 10 days referral, 1040 patients presenting with at 49 Canadian practitioner centres. Subsequent management strategies during a 6‐month follow‐up period were determined by the individual practitioners. Results:...

10.1046/j.1365-2036.2003.01646.x article EN Alimentary Pharmacology & Therapeutics 2003-06-01

<h3>Abstract</h3> <b>Objective:</b> To determine whether a "test for <i>Helicobacter pylori</i> and treat" strategy improves symptoms in patients with uninvestigated dyspepsia primary care. <b>Design:</b> Randomised placebo controlled trial. <b>Setting:</b> 36 family practices Canada. <b>Participants:</b> 294 positive <i>H</i><i>pylori</i> (<sup>13</sup>C- urea breath test) of at least moderate severity the preceding month. <b>Intervention:</b> Participants were randomised to twice daily...

10.1136/bmj.324.7344.1012 article EN BMJ 2002-04-27

Laser speckle flowgraphy (LSFG) enables noninvasive quantification of the retinal circulation in glaucoma patients. In this study, we tested intrasession reproducibility LSFG-NAVI, a modified LSFG technique.Sixty-five eyes from 33 subjects (male (M):female (F) = 17:16) with mean age 49.4 ± 11.2 years were examined study. Two parameters indicating - coefficient variation (COV) and intraclass correlation (ICC) analyzed three times on same day that blur rate (MBR) was measured using LSFG-NAVI....

10.2147/opth.s22093 article EN cc-by-nc Clinical ophthalmology 2011-08-01
Laurent Peyrin‐Biroulet Ailsa Hart Peter Bossuyt Millie D. Long Matthieu Allez and 95 more Pascal Juillerat Alessandro Armuzzi Edward V. Loftus Elham Ostad-Saffari Astrid Scalori Young S. Oh Swati Tole Akiko Chai Jennifer Pulley Stuart R. Lacey William J. Sandborn Humberto Aguilar Tariq Ali Ahmad Evangelos Akriviadis Xavier Aldeguer Manté Matthieu Allez I Altorjay Ashwin N. Ananthakrishnan Vibeke Andersen Montserrat Andreu García Alessandro Armuzzi Guy Aumais Irit Avni‐Biron Jeffrey Axler Kamran Ayub Filip Baert Mauro Bafutto George Bamias Isaac Bassan Curtis A. Baum Laurent Beaugerie Brian W. Behm Pradeep Bekal M. Catherine Bennett Fernando Bermejo San José Charles Bernstein Dominik Bettenworth Sudhir Bhaskar Livia Biancone Bahri M. Bilir Michael Blaeker Stuart Bloom V. R. Bohman Francisco Javier Bosques Padilla Peter Bossuyt Yoram Bouhnik Gerd Bouma Raymond Bourdages Stephan Brand Brian Bressler Markus Brückner Carsten Buening Franck Carbonnel Thomas C. Caves Jonathon Chapman Jae Hee Cheon Naoki Chiba Camelia Chioncel Dimitrios Christodoulou Martin Clodi Albert Cohen Gino Roberto Corazza Richard Corlin R. Cosintino Fraser Cummings Robin Dalal Silvio Danese Marc De Maeyer Carlos F. Francesconi Aminda De Silva Henry Debinski Pierre Desreumaux Olivier Dewit Geert R. D’Haens Sandra Di Felice Boratto Nik S. Ding Tyler Dixon Gerald W. Dryden George Aaron Du Vall Matthias Ebert Ana Echarri Robert Ehehalt Magdy Elkhashab Craig Ennis Jason Etzel Jan Fallingborg Brian Feagan R Fejes Daniel Ferraz de Campos Mazo Valéria Ferreira de Almeida e Borges Andreas Fischer Alan M. Fixelle Mark R. Fleisher Sharyle Fowler B. Freilich

10.1016/s2468-1253(21)00298-3 article EN ˜The œLancet. Gastroenterology & hepatology 2021-11-17
Silvio Danese Jean–Fréderic Colombel Milan Lukáš Javier P. Gisbert Geert R. D’Haens and 95 more Bu Hayee Remo Panaccione Hyun‐Soo Kim Walter Reinisch Helen E.J. Tyrrell Young S. Oh Swati Tole Akiko Chai Kirsten Chamberlain-James Meina Tang Stefan Schreiber Nazimuddin Aboo Tariq Ali Ahmad Xavier Aldeguer Manté Matthieu Allez Sven Almér Romain Altwegg Montserrat Andreu García Ramesh Arasaradnam Sandro Ardizzone Alessandro Armuzzi Ian Arnott Guy Aumais Irit Avni‐Biron Peter Barrow Ian Beales Fernando Bermejo San José Abraham F. Bezuidenhout Livia Biancone Michael Blaeker Stuart Bloom Bernd Bokemeyer Fabrizio Bossa Peter Bossuyt Guillaume Bouguen Yoram Bouhnik Gerd Bouma Raymond Bourdages Arnaud Bourreille Christian Boustière Tomáš Brabec Stephan Brand Carsten Buening Anthony Buisson Guillaume Cadiot Xavier Calvet Franck Carbonnel Daniel Carpio Jae Hee Cheon Naoki Chiba Camelia Chioncel Nicoleta-Claudia Cimpoeru Martin Clodi Gino Roberto Corazza R. Cosintino José Cotter Thomas Creed Fraser Cummings Silvio Danese Gian Luigi De’ Angelis Marc De Maeyer Milind Y. Desai Étienne Désilets Pierre Desreumaux Olivier Dewit Geert R. D’Haens Johanna Dinter Ecaterina Daniela Dobru Tomáš Douda Dan L. Dumitraşcu Matthias Ebert Ana Echarri Magdy Elkhashab Chang Soo Eun Brian G. Feagan R Fejes Catarina Fidalgo Sigal Fishman Bernard Flourié Sharyle Fowler Walter Fries Csaba Fülöp Mathurin Fuméry G Kiss Sonja Gassner Daniel R. Gaya Bastianello Germanà Liliana Gheorghe Cyrielle Gilletta Paolo Gionchetti Adrian-Eugen Goldis Raquel Gonçalves Jean–Charles Grimaud T Gyökeres Hervé Hagège

10.1016/s2468-1253(21)00294-6 article EN ˜The œLancet. Gastroenterology & hepatology 2021-11-17

The management of Helicobacter pylori negative patients with dyspepsia in primary care has not been studied placebo-controlled studies.H. symptoms at least moderate severity (> or =4 on a seven-point Likert scale) were recruited from 35 centers. Patients randomized to 4-wk treatment omeprazole 20 mg od, ranitidine 150 bid, cisapride placebo, followed by on-demand therapy for an additional 5 months. Treatment success was defined as no minimal (score < = 2 out 7), and assessed after 4 wk 6...

10.1111/j.1572-0241.2005.40280.x article EN The American Journal of Gastroenterology 2005-06-28

Summary Background Currently there is no consensus on the optimal method to measure severity of dyspepsia symptoms in clinical trials. Aim To validate 7‐point Global Overall Symptom scale. Methods The scale uses a Likert ranging from 1 = problem 7 very severe problem. Validation was performed two randomized‐controlled trials ( n 1121 and 512). Construct validity: compared with Quality Life Reflux And Dyspepsia, Gastrointestinal Rating Scale, Disease Questionnaire 10 specific using Spearman...

10.1111/j.1365-2036.2006.02774.x article EN Alimentary Pharmacology & Therapeutics 2006-01-20

The optically active form of tritium-labeled A-factor (2-isocapryloyl-3R-hydroxymethyl-gamma-butyrolactone), a pleiotropic autoregulator responsible for streptomycin production, resistance, and sporulation in Streptomyces griseus, was chemically synthesized. By using the radioactive A-factor, binding protein detected cytoplasmic fraction this organism. had an apparent molecular weight approximately 26,000, as determined by gel filtration. Scatchard analysis suggested that bound molar ratio...

10.1128/jb.171.8.4298-4302.1989 article EN Journal of Bacteriology 1989-08-01

The etiologies of functional dyspepsia (FD) are unclear, but in some studies, treatment with a proton pump inhibitor has been beneficial. objective this study was to evaluate the efficacy esomeprazole 40 mg once day compared placebo achieving symptom relief primary care patients FD.This randomized, placebo-controlled trial adult FD patients, who had at least moderate severity symptoms, defined as score > or =4 on 7-point Global Overall Symptom (GOS) scale. Patients were excluded if they...

10.1111/j.1572-0241.2006.00751.x article EN The American Journal of Gastroenterology 2006-07-01

Over the past decade, multiple clinical reports have demonstrated that use of propofol sedation for gastrointestinal endoscopy by gastroenterologists and trained nurses is safe effective in appropriately selected patients. Proposed benefits include rapid onset action, improved patient comfort clearance, as well prompt recovery discharge from unit. As a result medical evidence, number international professional societies endorsed endoscopy. In Canada, no formal guidelines currently exist....

10.1155/2008/268320 article EN cc-by Canadian Journal of Gastroenterology 2008-01-01

Eyes with glaucoma are characterized by optic neuropathy visual field defects in the areas corresponding to disk damage. The exact cause for glaucomatous has not been determined. Myopia shown be a risk factor glaucoma. purpose of this study was determine whether significant correlation existed between microcirculation and retinal nerve fiber layer thickness (RNFLT) patients myopic disks.Sixty eyes 60 disks were studied; 36 (men:women = 19:17) 24 no ocular diseases 14:10). mean deviation (MD)...

10.2147/opth.s23204 article EN cc-by-nc Clinical ophthalmology 2011-12-01
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