Colm O’Morain

33.6k citations

272 papers · 22.6k indexed · 11 hit papers · h-index 57

Impact in

Gastroenterology top 0.02%
- Gastroesophageal reflux and treatments
Small Animals top 0.02%
- Veterinary medicine and infectious diseases

Papers in

Gastroenterology 75
- Gastroesophageal reflux and treatments 52
Small Animals 40
- Veterinary medicine and infectious diseases 40

Co-authors: Françis Mégraud Peter Malfertheiner Javier P. Gisbert David Y. Graham Anthony Axon Theodore Rokkas Curt Tysk Emad El‐Omar
Journals: Alimentary Pharmacology & Therapeutics (25 papers)European Journal of Gastroenterology & Hepatology (22 papers)Gastroenterology (21 papers)Helicobacter (19 papers)Gut (17 papers)
Partner nations: Ireland United Kingdom United States

In The Last Decade

Colm O’Morain

268 papers receiving 21.8k citations

Hit Papers

11 papers align trajectories log scale

Management of Helicobacter pylori infection: the Maastricht VI/Florence consensus report 2022 · 718 citations

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if any of the following hold:

it has ≥500 total citations;
it reaches ≥1.5× the top-1% citation threshold for papers in the same subfield and year (the threshold is the minimum needed to enter the top 1%, not the average within it);
it reaches the top citation threshold in at least one of its specific research topics.

2022 Gut
2021 Gastroenterology
2016 Gut
2013 Gut
2012 Gut
2010 Journal of Crohn s and Colitis
2002 Alimentary Pharmacology & Therapeutics
2002 The American Journal of Human Genetics
2001 Nature
1997 European Journal of Gastroenterology & Hepatology
1996 Helicobacter

Peers

Countries citing papers authored by Colm O’Morain

Since Specialization

Citations

This map shows the geographic impact of Colm O’Morain's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Colm O’Morain with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Colm O’Morain more than expected).

Fields of papers citing papers by Colm O’Morain

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Colm O’Morain. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Colm O’Morain. The network helps show where Colm O’Morain may publish in the future.

Co-authorship network

The 25 scholars most cited alongside Colm O’Morain, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with Colm O’Morain Line = papers co-authored together Colm O’Morain links everyone, so they are left out of the graph.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

#	Work
1	Comparative maintenance performance of all biologic agents and small molecules in ulcerative colitis: a network meta-analysis European Journal of Gastroenterology & Hepatology ·Theodore Rokkas, Javier P. Gisbert, Konstantinos Ekmektzoglou, Themistocles Dassopoulos, Yaron Niv, Colm O’Morain	2024	6
2	European Registry on Helicobacter pylori management (Hp-EuReg): First-line Therapy in Israel. PubMed ·Doron Boltin, Kaifu Zhang, Adi Lahat, 駒慧春山, Olga P. Nyssen, Françis Mégraud, Colm O’Morain, Javier P. Gisbert, Yaron Niv	2021	2
3	The Irish Helicobacter pylori Working Group consensus for the diagnosis and treatment of H. pylori infection in adult patients in Ireland European Journal of Gastroenterology & Hepatology ·Sinéad M. Smith, Breida Boyle, Denise Brennan, Martin Buckley, Paul Crotty, Maeve Doyle, Richard J. Farrell, Delinda Stinnette, David Kevans, Peter Malfertheiner, Françis Mégraud, Sean G. Nugent, Anthony O’Connor, Colm O’Morain, Shiobhan R. Weston, Deirdre McNamara	2017	27
4	Management of Helicobacter pylori infection—the Maastricht V/Florence Consensus Report Gut ·Peter Malfertheiner, Françis Mégraud, Colm O’Morain, Javier P. Gisbert, Ernst J. Kuipers, Anthony Axon, Franco Bazzoli, Antonio Gasbarrini, J. Atherton, David Y. Graham, Richard H. Hunt, Paul Moayyedi, Theodore Rokkas, Massimo Rugge, Michael Selgrad, Sebastian Suerbaum, Kentaro Sugano, Emad El‐Omar Hit paper breakdown →	2016	2089
5	Tolerability of Shortened Infliximab Infusion in Scheduled Maintenance Therapy for IBD: A Prospective Multi-center European Cohort Study Journal of Gastroenterology and Hepatology Research ·Ragnar Befrits, Annika Olsson, Javier P. Choton, T.D. Merritts, Rivera Fernández, Gavin D. Douglas, Patrick Gorringe, Filip Haluška, Rizal Furqan Ramadhan, Marc Schreiber, Séverine Vermeire, Paul Rutgeerts, Colm O’Morain, Gert Van Assche	2013	1
6	Management of Helicobacter pylori infection—the Maastricht IV/ Florence Consensus Report Gut ·Peter Malfertheiner, Françis Mégraud, Colm O’Morain, J. Atherton, Anthony Axon, Franco Bazzoli, Gian Franco Gensini, Javier P. Gisbert, David Y. Graham, Theodore Rokkas, Emad El‐Omar, Ernst J. Kuipers, (unknown) Hit paper breakdown →	2012	1724
7	Colonoscopy completion rates--are we prepared for a national screening programme? PubMed ·Nancy Yeh, 모하마드 무스타파 모노워, Barbara M. Ryan, Colm O’Morain	2007	2
8	Liquid diets for Crohn's disease Gut ·Maria OʼSullivan, Colm O’Morain	2001	9
9	Gastro-oesophageal reflux disease and Helicobacter pylori : an intricate relation Gut ·Deirdre McNamara, Colm O’Morain	1999	21
10	Gastric epithelial cell kinetics in the progression from normal mucosa to gastric carcinoma. Gut ·Rachel Cahill, Edoardo Ferri, S. Beattie, H. Hamilton, Colm O’Morain	1996	106
11	Recrudescence of Helicobacter pylori after apparently successful eradication: novel application of randomly amplified polymorphic DNA fingerprinting. Gut ·Han Xia, Henry J. Windle, D. G. Marshall, Cyril J. Smyth, C. T. Keane, Colm O’Morain	1995	74
12	The ECP calcium fibre polyp prevention study preliminary report. ECP Colon Group. PubMed ·Jean Faivre, M C Boutron, F Doyon, Massimo Pignatelli, O Kronbörg, Attilio Giacosa, S. Turney, Enric Benito, Colm O’Morain	1993	8
13	Effects of vitamin antioxidant supplementation on cell kinetics of patients with adenomatous polyps. Gut ·Rachel Cahill, Kathryn O’Sullivan, Paul M. Mathias, S. Beattie, H. Hamilton, Colm O’Morain	1993	49
14	Combined ultrasound-guided extracorporeal shockwave lithotripsy and MTBE instillation in the treatment of common bile duct stones. PubMed ·Ara Darzi, J. R. T. Monson, P. W. N. Keeling, Colm O’Morain, W. A. Tanner, F B V Keane	1991	4
15	Effect of treatment on Campylobacter pylori in peptic disease: a randomised prospective trial. Gut ·H. Humphreys, Stephen C Bourke, Cornelius P. Dooley, D. J. McKenna, Brian Power, C. T. Keane, E. C. Sweeney, Colm O’Morain	1988	52
16	Elemental diet as primary treatment of acute Crohn's disease: a controlled trial. BMJ ·Colm O’Morain, Anthony W. Segal, A J Levi	1984	334
17	Organelle pathology in ulcerative and Crohn's colitis with special reference to the lysosomal alterations. Gut ·Colm O’Morain, Paul Smethurst, A J Levi, T. J. Peters	1984	25
18	Reversible male infertility due to sulphasalazine: studies in man and rat. Gut ·Colm O’Morain, Paul Smethurst, Caroline J Doré, A J Levi	1984	164
19	Biochemical analysis of enzymic markers of inflammation in rectal biopsies from patients with ulcerative colitis and Crohn's disease. Journal of Clinical Pathology ·Colm O’Morain, Paul Smethurst, A J Levi, Timothy J. Peters	1983	15
20	Elemental diets in treatment of acute Crohn's disease. BMJ ·Colm O’Morain, Anthony W. Segal, A J Levi	1980	114

About Colm O’Morain

Colm O’Morain is a scholar working on Gastroenterology, Small Animals, Surgery, Genetics and Epidemiology, having authored 272 papers that have together received 22.6k indexed citations. Recurring topics across this work include Helicobacter pylori-related gastroenterology studies (143 papers), Inflammatory Bowel Disease (71 papers), Eosinophilic Esophagitis (62 papers), Microscopic Colitis (62 papers), Gastric Cancer Management and Outcomes (54 papers), Gastroesophageal reflux and treatments (52 papers), Veterinary medicine and infectious diseases (40 papers) and Colorectal Cancer Screening and Detection (21 papers). The work is most often cited by research in Gastroenterology (6.3k citations), Small Animals (2.9k citations), Surgery (14.3k citations), Genetics (6.4k citations) and Immunology (4.2k citations). Colm O’Morain has collaborated with scholars based in Ireland, United Kingdom and United States. Frequent co-authors include Françis Mégraud, Peter Malfertheiner, Javier P. Gisbert, David Y. Graham, Anthony Axon, Theodore Rokkas, Curt Tysk, Emad El‐Omar, A J Levi and Vibeke Binder. Their work appears in journals such as Alimentary Pharmacology & Therapeutics, European Journal of Gastroenterology & Hepatology, Gastroenterology, Helicobacter and Gut.

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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