World's Best Scientists 2026 revealed!

D-Index & Metrics

Medicine

D-Index
87
Citations
27716
World Ranking
13646
National Ranking
1265

Ingvar Bjarnason publications per year

1982: 4 publications 1983: 5 publications 1984: 18 publications 1985: 7 publications 1986: 5 publications 1987: 7 publications 1988: 8 publications 1989: 9 publications 1990: 6 publications 1991: 7 publications 1992: 7 publications 1993: 13 publications 1994: 11 publications 1995: 13 publications 1996: 10 publications 1997: 6 publications 1998: 18 publications 1999: 12 publications 2000: 19 publications 2001: 16 publications 2002: 12 publications 2003: 12 publications 2004: 10 publications 2005: 10 publications 2006: 7 publications 2007: 15 publications 2008: 8 publications 2009: 9 publications 2010: 9 publications 2011: 3 publications 2012: 10 publications 2013: 9 publications 2014: 8 publications 2015: 19 publications 2016: 9 publications 2017: 6 publications 2018: 2 publications 2019: 5 publications 2020: 5 publications 2021: 1 publications 2022: 3 publications 2023: 1 publications 2024: 3 publications
1982 2024

377 publications in total across all disciplines

Ingvar Bjarnason publication distribution in Medicine in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Medicine in 2026. The highlighted bar marks where Ingvar Bjarnason sits on this spectrum.

101–120 publications: 5 scientists 121–140 publications: 26 scientists 141–160 publications: 73 scientists 161–180 publications: 155 scientists 181–200 publications: 230 scientists 201–220 publications: 363 scientists 221–240 publications: 487 scientists 241–260 publications: 545 scientists 261–280 publications: 722 scientists 281–300 publications: 768 scientists 301–320 publications: 834 scientists 321–340 publications: 895 scientists 341–360 publications: 922 scientists 361–380 publications: 838 scientists 381–400 publications: 861 scientists 401–420 publications: 918 scientists 421–440 publications: 806 scientists 441–460 publications: 771 scientists 461–480 publications: 751 scientists 481–500 publications: 713 scientists 501–520 publications: 617 scientists 521–540 publications: 610 scientists 541–560 publications: 537 scientists 561–580 publications: 504 scientists 581–600 publications: 509 scientists 601–620 publications: 396 scientists 621–640 publications: 386 scientists 641–660 publications: 371 scientists 661–680 publications: 340 scientists 681–700 publications: 336 scientists 701–720 publications: 307 scientists 721–740 publications: 259 scientists 741–760 publications: 230 scientists 761–780 publications: 228 scientists 781–800 publications: 217 scientists 801–820 publications: 204 scientists 821–840 publications: 186 scientists 841–860 publications: 177 scientists 861–880 publications: 155 scientists 881–900 publications: 139 scientists 901–920 publications: 145 scientists 921–940 publications: 116 scientists 941–960 publications: 133 scientists 961–980 publications: 91 scientists 981–1,000 publications: 96 scientists 1,001–1,020 publications: 77 scientists 1,021–1,040 publications: 70 scientists 1,041–1,060 publications: 63 scientists 1,061–1,080 publications: 77 scientists 1,081–1,100 publications: 49 scientists 1,101–1,120 publications: 54 scientists 1,121–1,140 publications: 49 scientists 1,141–1,160 publications: 51 scientists 1,161–1,180 publications: 35 scientists 1,181–1,200 publications: 39 scientists 1,201–1,220 publications: 26 scientists 1,221–1,240 publications: 37 scientists 1,241–1,260 publications: 36 scientists 1,261–1,280 publications: 27 scientists 1,281–1,300 publications: 32 scientists 1,301–1,320 publications: 28 scientists 1,321–1,340 publications: 17 scientists 1,341–1,360 publications: 30 scientists 1,361–1,380 publications: 28 scientists 1,381–1,400 publications: 17 scientists 1,401–1,420 publications: 21 scientists 1,421–1,440 publications: 15 scientists 1,441–1,460 publications: 12 scientists 1,461–1,480 publications: 12 scientists 1,481–1,500 publications: 18 scientists 1,501–1,520 publications: 14 scientists 1,521–1,540 publications: 17 scientists 1,541–1,560 publications: 15 scientists 1,561–1,580 publications: 6 scientists 1,581–1,600 publications: 2 scientists 1,601–1,620 publications: 12 scientists 1,621–1,640 publications: 11 scientists 1,641–1,660 publications: 8 scientists 1,661–1,680 publications: 5 scientists 1,681–1,700 publications: 5 scientists 1,701–1,720 publications: 10 scientists 1,721–1,740 publications: 12 scientists 1,741–1,760 publications: 14 scientists 1,761–1,780 publications: 6 scientists 1,781–1,795 publications: 5 scientists 1,796+ publications: 100 scientists
101 publications 1,796+

This scientist: 368 publications — 32nd percentile

32% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,796 publications or more.

Ingvar Bjarnason D-index placement in Medicine in 2026

The chart shows the D-index (discipline H-index) distribution of Medicine scientists ranked by Research.com in 2026. The highlighted bar marks where Ingvar Bjarnason sits on this spectrum.

70–71 D-Index: 226 scientists 72–73 D-Index: 391 scientists 74–75 D-Index: 574 scientists 76–77 D-Index: 730 scientists 78–79 D-Index: 891 scientists 80–81 D-Index: 972 scientists 82–83 D-Index: 1,027 scientists 84–85 D-Index: 1,003 scientists 86–87 D-Index: 960 scientists 88–89 D-Index: 970 scientists 90–91 D-Index: 922 scientists 92–93 D-Index: 839 scientists 94–95 D-Index: 808 scientists 96–97 D-Index: 779 scientists 98–99 D-Index: 668 scientists 100–101 D-Index: 611 scientists 102–103 D-Index: 630 scientists 104–105 D-Index: 513 scientists 106–107 D-Index: 541 scientists 108–109 D-Index: 445 scientists 110–111 D-Index: 429 scientists 112–113 D-Index: 399 scientists 114–115 D-Index: 393 scientists 116–117 D-Index: 318 scientists 118–119 D-Index: 302 scientists 120–121 D-Index: 287 scientists 122–123 D-Index: 255 scientists 124–125 D-Index: 256 scientists 126–127 D-Index: 252 scientists 128–129 D-Index: 230 scientists 130–131 D-Index: 179 scientists 132–133 D-Index: 168 scientists 134–135 D-Index: 163 scientists 136–137 D-Index: 159 scientists 138–139 D-Index: 134 scientists 140–141 D-Index: 134 scientists 142–143 D-Index: 118 scientists 144–145 D-Index: 109 scientists 146–147 D-Index: 106 scientists 148–149 D-Index: 74 scientists 150–151 D-Index: 79 scientists 152–153 D-Index: 80 scientists 154–155 D-Index: 87 scientists 156–157 D-Index: 57 scientists 158–159 D-Index: 74 scientists 160–161 D-Index: 69 scientists 162–163 D-Index: 60 scientists 164–165 D-Index: 53 scientists 166–167 D-Index: 39 scientists 168–169 D-Index: 42 scientists 170–171 D-Index: 32 scientists 172–173 D-Index: 39 scientists 174–175 D-Index: 40 scientists 176–177 D-Index: 28 scientists 178–179 D-Index: 19 scientists 180–181 D-Index: 23 scientists 182–183 D-Index: 31 scientists 184–185 D-Index: 18 scientists 186–187 D-Index: 20 scientists 188–189 D-Index: 22 scientists 190–191 D-Index: 13 scientists 192–193 D-Index: 21 scientists 194–195 D-Index: 12 scientists 196–197 D-Index: 12 scientists 198–199 D-Index: 14 scientists 200–201 D-Index: 15 scientists 202–203 D-Index: 13 scientists 204–205 D-Index: 10 scientists 206–207 D-Index: 8 scientists 208–209 D-Index: 4 scientists 210–211 D-Index: 12 scientists 212–213 D-Index: 11 scientists 214–215 D-Index: 10 scientists 216 D-Index: 4 scientists 217+ D-Index: 98 scientists
70 D-Index 217+

This scientist: 87 D-Index — 34th percentile

34% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 217 D-Index or more.

Overview

Ingvar Bjarnason is affiliated with King's College London in the United Kingdom and has contributed extensively to the field of medicine, with a focus on surgery and gastrointestinal disorders. Their research work spans 16 publications primarily within the domain of medicine, with significant contributions in subfields including surgery, molecular biology, infectious diseases, food science, and emergency medicine.

The scientist's main research topics include:

  • Diverticular Disease and Complications
  • Gastrointestinal disorders and treatments
  • Esophageal and GI Pathology
  • Gut microbiota and health
  • Clostridium difficile and Clostridium perfringens research
  • Probiotics and Fermented Foods
  • Appendicitis Diagnosis and Management

Among Ingvar Bjarnason's recent papers are:

  • "A 4-strain probiotic supplement influences gut microbiota composition and gut wall function in patients with ulcerative colitis," 2020, International Journal of Pharmaceutics
  • "NSAID-enteropathy and intestinal microbes," 2020, Inflammopharmacology
  • "Diverticular disease: update on pathophysiology, classification and management," 2023, Frontline Gastroenterology
  • "Mo1393: A PROSPECTIVE STUDY EVALUATING THE INCIDENCE OF DE NOVO IBS FOLLOWING DIVERTICULITIS AT A TERTIARY REFERRAL CENTER," 2022, Gastroenterology
  • "P300 A prospective study evaluating the incidence of de novo IBS following diverticulitis," 2022, Poster presentations

Frequent co-authors in their work include:

  • Bu Hayee
  • Amyn Haji
  • Sophie Williams
  • Suha Jabak
  • Mehul Patel

Ingvar Bjarnason publishes regularly in the following venues:

  • Poster presentations
  • Gastrointestinal Endoscopy
  • International Journal of Pharmaceutics
  • Frontline Gastroenterology
  • Inflammopharmacology

Best Publications

  • Side effects of nonsteroidal anti-inflammatory drugs on the small and large intestine in humans

    Bjarnason I;Hayllar J;MacPherson Aj;Russell As

  • Intestinal permeability: an overview.

    Ingvar Bjarnason;Andrew Macpherson;Daniel Hollander

  • Surrogate markers of intestinal inflammation are predictive of relapse in patients with inflammatory bowel disease

    Jeremy A Tibble;Gudmundur Sigthorsson;Steven Bridger;Magne K. Fagerhol

  • A simple method for assessing intestinal inflammation in Crohn's disease

    J Tibble;K Teahon;B Thjodleifsson;A Roseth

  • Mucosal antibodies in inflammatory bowel disease are directed against intestinal bacteria.

    A Macpherson;U Y Khoo;I Forgacs;J Philpott-Howard

  • A quantitative analysis of NSAID-induced small bowel pathology by capsule enteroscopy.

    Laurence Maiden;Bjarni Thjodleifsson;Asgeir Theodors;Juan Gonzalez

  • Use of surrogate markers of inflammation and Rome criteria to distinguish organic from nonorganic intestinal disease

    Jeremy A. Tibble;Gudmundur Sigthorsson;Russell Foster;Ian Forgacs

  • Reduced bone density in patients with inflammatory bowel disease.

    I Bjarnason;A Macpherson;C Mackintosh;M Buxton-Thomas

  • Nonsteroidal antiinflammatory drug-induced intestinal inflammation in humans.

    I Bjarnason;G Zanelli;T Smith;P Prouse

  • INTESTINAL PERMEABILITY AND INFLAMMATION IN RHEUMATOID ARTHRITIS: EFFECTS OF NON-STEROIDAL ANTI-INFLAMMATORY DRUGS

    Ingvar Bjarnason;Alex So;A.Jonathan Levi;TimothyJ. Peters

  • Mechanisms of Damage to the Gastrointestinal Tract From Nonsteroidal Anti-Inflammatory Drugs

    Ingvar Bjarnason;Carmelo Scarpignato;Erik Holmgren;Michael Olszewski

  • Absorption of 151chromium-labeled ethylenediaminetetraacetate in inflammatory bowel disease

    Ingvar Bjarnason;Colm O'Morain;A.Jonathan Levi;Timothy J. Peters

  • Prevalence and mechanism of nonsteroidal anti-inflammatory drug-induced clinical relapse in patients with inflammatory bowel disease.

    Ken Takeuchi;Simon Smale;Purushothaman Premchand;Laurence Maiden

  • High prevalence of NSAID enteropathy as shown by a simple faecal test

    J A Tibble;G Sigthorsson;R Foster;D Scott

  • Mitochondrial damage: a possible mechanism of the “topical” phase of NSAID induced injury to the rat intestine

    S Somasundaram;S Rafi;J Hayllar;G Sigthorsson

  • Effect of non-steroidal anti-inflammatory drugs and prostaglandins on the permeability of the human small intestine.

    I Bjarnason;P Williams;P Smethurst;T J Peters

  • A PERSISTENT DEFECT IN INTESTINAL PERMEABILITY IN COELIAC DISEASE DEMONSTRATED BY A 51Cr-LABELLED EDTA ABSORPTION TEST

    Ingvar Bjarnason;TimothyJ. Peters;Norman Veall

  • Adacolumn, an adsorptive carrier based granulocyte and monocyte apheresis device for the treatment of inflammatory and refractory diseases associated with leukocytes.

    Abby R Saniabadi;Hiroyuki Hanai;Ken Takeuchi;Kazuo Umemura

  • Long-term effects of nonsteroidal anti-inflammatory drugs and cyclooxygenase-2 selective agents on the small bowel: a cross-sectional capsule enteroscopy study.

    Laurence Maiden;Bjarni Thjodleifsson;Anna Seigal;Ingvar Iain Bjarnason

  • COX-2 inhibitors.

    Ingvar Bjarnason

Frequent Co-Authors

Timothy J. Peters
Timothy J. Peters University of Bristol
Andrew J. Macpherson
Andrew J. Macpherson University of Bern
David Scott
David Scott Ascension Health
Angel Lanas
Angel Lanas University of Zaragoza
Carmelo Scarpignato
Carmelo Scarpignato University of Parma
Anil Dhawan
Anil Dhawan King's College London
Freddy Haesebrouck
Freddy Haesebrouck Ghent University
Daniel F. Gudbjartsson
Daniel F. Gudbjartsson deCODE Genetics (Iceland)
Frank Pasmans
Frank Pasmans Ghent University
Richard Ducatelle
Richard Ducatelle Ghent University

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