Evidence map›Paper›PMID 42771207›Full record

ArticleObesity surgery2026

The Impact of Hospital Volume on Bariatric Surgery Safety: A Population-Based Study using Data from the National Bariatric Surgery Registry of the United Kingdom.

Stergios Bobotis, Bibek Das, Henry Robb, Chetan Parmar, Yasser Abdul Aal, Nour El Ghazal, Hutan Ashrafian, Omar M Ghanem, Emma Rose McGlonne, Omar Khan and 1 more

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In one paragraph

Article in Obesity surgery, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

0numbers the graph read from it
0cells of the map it votes in
0citing papers in PubMed
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1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

0 citing papers in PubMed.

No citing paper in PubMed yet.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

11 authors.

Stergios BobotisDepartment of Surgery, Maidstone and Tunbridge Wells NHS Trust, Maidstone, UK.ORCID https://orcid.org/0009-0005-2324-0001
Bibek DasDepartment of Surgery and Cancer, Imperial College London, London, UK.
Henry RobbDepartment of Surgery and Cancer, Imperial College London, London, UK.
Chetan ParmarDepartment of Surgery, Whittington Health NHS Trust, London, UK.ORCID https://orcid.org/0000-0002-1238-6524
Yasser Abdul AalDepartment of Surgery, Maidstone and Tunbridge Wells NHS Trust, Maidstone, UK.
Nour El GhazalSt George's, University of London, London, UK.
Hutan AshrafianDepartment of Surgery and Cancer, Imperial College London, London, UK.ORCID https://orcid.org/0000-0003-1668-0672
Omar M GhanemDepartment of Surgery and Cancer, Imperial College London, London, UK.
Emma Rose McGlonneDepartment of Surgery and Cancer, Imperial College London, London, UK.
Omar KhanSt George's, University of London, London, UK.
Matyas FehervariDepartment of Surgery, Maidstone and Tunbridge Wells NHS Trust, Maidstone, UK. matyas.fehervari15@imperial.ac.uk.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundHospital procedural volume is recognised as an important determinant of outcomes in complex surgery. However, the volume-outcome relationship in bariatric surgery remains incompletely defined. This study examined the association between hospital procedural volume and major complications in primary metabolic bariatric surgery using the United Kingdom (UK) National Bariatric Surgery Registry (NBSR).

methodsProspectively collected NBSR data from 2014 to 2023 were analysed. Adults undergoing RYGB, SG, or OAGB were included. Hospitals were stratified into quartiles using a four-year moving average of annual procedural volume. Primary outcomes were major postoperative complications, including gastrojejunal obstruction, bleeding, and Clavien-Dindo grade ≥ III events. Multivariable logistic regression assessed associations between hospital volume and outcomes.

resultsA total of 54,195 patients were included (RYGB: 23,139; SG: 25,300; OAGB: 4,744). Complication rates were low overall. For RYGB, obstruction rates declined with increasing hospital volume (0.8% in quartile I vs. 0.2% in quartile IV; p < 0.001). Higher volume independently predicted lower risk of obstruction (OR 0.31, 95% CI 0.16-0.58; p < 0.001) and Clavien-Dindo ≥ III complications (OR 0.71, 95% CI 0.51-0.99; p = 0.044). No significant associations between volume and outcomes were observed for SG or OAGB.

conclusionHigher hospital volume was associated with fewer severe complications following RYGB, although complication rates remained low across all volume quartiles. Outcomes for SG and OAGB were consistently favourable across all volume quartiles, indicating a lesser influence of hospital volume. These findings support continued evaluation of minimum volume standards within bariatric accreditation frameworks.

Indexed as

Bariatric SurgeryHospitals, High-VolumeHospitals, Low-VolumeObesity, MorbidPatient SafetyPostoperative ComplicationsAdultFemaleHumansMaleMiddle AgedProspective StudiesRegistriesUnited Kingdom

Identifiers

PMID42771207
PMCPMC13645993

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.