Pat O’Brien

4.9k citations

43 papers · 2.6k indexed · 6 hit papers · h-index 17

Impact in

Obstetrics and Gynecology top 0.2%
- COVID-19 Impact on Reproduction
- Pregnancy and preeclampsia studies
- Maternal and Perinatal Health Interventions
Pediatrics, Perinatology and Child Health top 0.5%
- Global Maternal and Child Health
- Maternal and fetal healthcare

Papers in ⓘ

Obstetrics and Gynecology 22
- COVID-19 Impact on Reproduction 12
- Pregnancy and preeclampsia studies 7
- Maternal and Perinatal Health Interventions 5
Pediatrics, Perinatology and Child Health 21
- Maternal and fetal healthcare 9
- Birth, Development, and Health 4
- Global Maternal and Child Health 4
- Assisted Reproductive Technology and Twin Pregnancy 4

Co-authors: Asma Khalil (22 shared papers)Laura A. Magee (6 shared papers)Peter von Dadelszen (6 shared papers)Tim Draycott (7 shared papers)Shamez Ladhani (15 shared papers)Edward P. Morris (5 shared papers)Erkan Kalafat (6 shared papers)Kirsty Le Doaré (5 shared papers)
Journals: Ultrasound in Obstetrics and Gynecology (4 papers)Nature Communications (3 papers)BJOG An International Journal of Obstetrics & Gynaecology (3 papers)The Lancet Global Health (3 papers)The Lancet Infectious Diseases (2 papers)
Partner nations: United Kingdom Sweden Türkiye

In The Last Decade

Pat O’Brien

41 papers receiving 2.5k citations

Hit Papers

6 papers align trajectories log scale

Systematic review and meta-analysis of the effectiveness and perinatal outcomes of COVID-19 vaccination in pregnancy 2022 · 166 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 Nature Communications
2021 The Lancet Global Health
2021 American Journal of Obstetrics and Gynecology
2020 Ultrasound in Obstetrics and Gynecology
2020 JAMA
2020 EClinicalMedicine

Peers

Countries citing papers authored by Pat O’Brien

Since Specialization

Citations

This map shows the geographic impact of Pat O’Brien'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 Pat O’Brien with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Pat O’Brien more than expected).

Fields of papers citing papers by Pat O’Brien

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Pat O’Brien. 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 Pat O’Brien. The network helps show where Pat O’Brien may publish in the future.

Co-authors

The 25 scholars most cited alongside Pat O’Brien, 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 Pat O’Brien Line = papers co-authored together Pat O’Brien links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

Showing the 20 most-cited of 43 papers — load more, or switch the sort, to bring in the rest.

#	Work
1	Effects of the COVID-19 pandemic on maternal and perinatal outcomes: a systematic review and meta-analysis The Lancet Global Health ·B Chmielewska, Imogen Barratt, Rosemary Townsend, Erkan Kalafat, Jan van der Meulen, Ipek Gurol‐Urganci, Pat O’Brien, Edward Morris, Tim Draycott, Shakila Thangaratinam, Kirsty Le Doaré, Shamez Ladhani, Peter von Dadelszen, Laura A. Magee, Asma Khalil Hit paper breakdown →	2021	631
2	Coronavirus in pregnancy and delivery: rapid review Ultrasound in Obstetrics and Gynecology ·Edward Mullins, David Evans, Russell Viner, Pat O’Brien, Edward P. Morris Hit paper breakdown →	2020	340
3	Change in the Incidence of Stillbirth and Preterm Delivery During the COVID-19 Pandemic JAMA ·Asma Khalil, Peter von Dadelszen, Tim Draycott, Austin Ugwumadu, Pat O’Brien, Laura A. Magee Hit paper breakdown →	2020	317
4	COVID-19 vaccination during pregnancy: coverage and safety American Journal of Obstetrics and Gynecology ·Helena Blakeway, Smriti Prasad, Erkan Kalafat, Paul T. Heath, Shamez Ladhani, Kirsty Le Doaré, Laura A. Magee, Pat O’Brien, Arezou Rezvani, Peter von Dadelszen, Asma Khalil Hit paper breakdown →	2021	264
5	SARS-CoV-2 infection in pregnancy: A systematic review and meta-analysis of clinical features and pregnancy outcomes EClinicalMedicine ·Asma Khalil, Erkan Kalafat, Can Benlioğlu, Pat O’Brien, Edward P. Morris, Tim Draycott, Shakila Thangaratinam, Kirsty Le Doaré, Paul T. Heath, Shamez Ladhani, Peter von Dadelszen, Laura A. Magee Hit paper breakdown →	2020	227
6	Systematic review and meta-analysis of the effectiveness and perinatal outcomes of COVID-19 vaccination in pregnancy Nature Communications ·Smriti Prasad, Erkan Kalafat, Helena Blakeway, Rosemary Townsend, Pat O’Brien, Edward P. Morris, Tim Draycott, Shakila Thangaratinam, Kirsty Le Doaré, Shamez Ladhani, Peter von Dadelszen, Laura A. Magee, Paul T. Heath, Asma Khalil Hit paper breakdown →	2022	166
7	Global changes in maternity care provision during the COVID-19 pandemic: A systematic review and meta-analysis EClinicalMedicine ·Rosemary Townsend, B Chmielewska, Imogen Barratt, Erkan Kalafat, Jan van der Meulen, Ipek Gurol‐Urganci, Pat O’Brien, Edward P. Morris, Tim Draycott, Shakila Thangaratinam, Kirsty Le Doaré, Shamez Ladhani, Peter von Dadelszen, Laura A. Magee, Asma Khalil	2021	115
8	Use of oral misoprostol in the prevention of postpartum haemorrhage BJOG An International Journal of Obstetrics & Gynaecology ·Hazem El‐Refaey, Pat O’Brien, Wale Morafa, Jane Walder, Charles H. Rodeck	1997	93
9	The misoprostol third stage of labour study: a randomised controlled comparison between orally administered misoprostol and standard management BJOG An International Journal of Obstetrics & Gynaecology ·Hazem El‐Refaey, Randa Nooh, Pat O’Brien, Mona Abdalla, Michael Geary, Jane Walder, Charles H. Rodeck	2000	65
10	Ultrasound detection of nuchal cord prior to labor induction and the risk of Cesarean section Ultrasound in Obstetrics and Gynecology ·Elisabeth Peregrine, Pat O’Brien, Eric Jauniaux	2004	50
11	Management and implications of severe COVID‐19 in pregnancy in the UK: data from the UK Obstetric Surveillance System national cohort Acta Obstetricia Et Gynecologica Scandinavica ·Nicola Vousden, Rema Ramakrishnan, Kathryn Bunch, Edward P. Morris, Nigel Simpson, Chris Gale, Pat O’Brien, Maria Quigley, Peter Brocklehurst, Jennifer J. Kurinczuk, Marian Knight	2022	44
12	COVID-19 screening of health-care workers in a London maternity hospital The Lancet Infectious Diseases ·Asma Khalil, Robert A. Hill, Shamez Ladhani, Katherine Pattisson, Pat O’Brien	2020	34
13	Monkeypox and pregnancy: what do obstetricians need to know? Ultrasound in Obstetrics and Gynecology ·Asma Khalil, Athina Samara, Pat O’Brien, Edward Morris, Tim Draycott, Clare A. Lees, Shamez Ladhani	2022	31
14	Pregnancy and multiple sclerosis Journal of Neurology Neurosurgery & Psychiatry ·M Lee, Pat O’Brien	2008	31
15	Monkeypox vaccines in pregnancy: lessons must be learned from COVID-19 The Lancet Global Health ·Asma Khalil, Athina Samara, Pat O’Brien, Edward Morris, Tim Draycott, Christoph Lees, Shamez Ladhani	2022	30
16	A call to action: the global failure to effectively tackle maternal mortality rates The Lancet Global Health ·Asma Khalil, Athina Samara, Pat O’Brien, Conrado Milani Coutinho, Silvana Maria Quintana, Shamez Ladhani	2023	20
17	Secretion of atrial natriuretic peptide and digoxin-like immunoreactive substance during pregnancy. Clinical Chemistry ·Pankaj Shrivastav, Deborah Gill, V D'Souza, Pat O’Brien, Paresh Dandona	1988	16
18	A comparison between the pregnancy outcome of women with gestation diabetes treated with glibenclamide and those treated with insulin. PubMed ·Jason M. H. Lim, Y Tayob, Pat O’Brien, Robert W. Shaw	1997	15
19	Efficacy of carbetocin in the prevention of postpartum hemorrhage: a systematic review and Bayesian meta-analysis of randomized trials The Journal of Maternal-Fetal & Neonatal Medicine ·Erkan Kalafat, Ali Gökçe, Pat O’Brien, Can Benlioğlu, Acar Koç, Onur Karaaslan, Asma Khalil	2019	15
20	Call for a unified approach to Monkeypox infection in pregnancy: Lessons from the COVID-19 pandemic Nature Communications ·Asma Khalil, Athina Samara, Pat O’Brien, Shamez Ladhani	2022	12

About Pat O’Brien

Pat O’Brien is a scholar working on Obstetrics and Gynecology, Pediatrics, Perinatology and Child Health, Public Health, Environmental and Occupational Health, Epidemiology and Infectious Diseases, having authored 43 papers that have together received 2.6k indexed citations. Recurring topics across this work include COVID-19 Impact on Reproduction (12 papers), Maternal and fetal healthcare (9 papers), Pregnancy and preeclampsia studies (7 papers), Maternal and Perinatal Health Interventions (5 papers), Poxvirus research and outbreaks (4 papers), Birth, Development, and Health (4 papers), Global Maternal and Child Health (4 papers) and Assisted Reproductive Technology and Twin Pregnancy (4 papers). The work is most often cited by research in Obstetrics and Gynecology (2.0k citations), Pediatrics, Perinatology and Child Health (1.2k citations), Public Health, Environmental and Occupational Health (1.0k citations), Health (280 citations) and Virology (79 citations). Pat O’Brien has collaborated with scholars based in United Kingdom, Sweden and Türkiye. Frequent co-authors include Asma Khalil, Laura A. Magee, Peter von Dadelszen, Tim Draycott, Shamez Ladhani, Edward P. Morris, Erkan Kalafat, Kirsty Le Doaré, Shakila Thangaratinam and Russell Viner. Their work appears in journals such as Ultrasound in Obstetrics and Gynecology, Nature Communications, BJOG An International Journal of Obstetrics & Gynaecology, The Lancet Global Health and The Lancet Infectious Diseases.

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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