Evidence map›Paper›PMID 33857492›Full record

ArticleThe Annals of thoracic surgery2022

The Impact of Center Volume on Outcomes in Lung Transplantation.

Zhizhou Yang, Melanie P Subramanian, Yan Yan, Bryan F Meyers, Benjamin D Kozower, G Alexander Patterson, Ruben G Nava, Ramsey R Hachem, Chad A Witt, Michael K Pasque and 5 more

Abstract read
In one paragraph

Article in The Annals of thoracic surgery, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.

0numbers the graph read from it
0cells of the map it votes in
17citing papers in PubMed
–field-weighted citation impact
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

17 citing papers in PubMed.

  1. Article
  2. Article
  3. Time as a Therapeutic Ally: The Promise of Long-Term Solid Organ and Tissue Perfusion.Transplant international : official journal of the European Society for Organ Transplantation · 2026
    Review
  4. Article
  5. Article
  6. Article
  7. Basiliximab induction immunosuppression and lung transplant outcomes: Propensity analysis in a multicenter cohort.The Journal of heart and lung transplantation : the official publication of the International Society for Heart Transplantation · 2025
    Article
  8. Article
  9. The role of coronary artery disease in lung transplantation: a propensity-matched analysis.Clinical research in cardiology : official journal of the German Cardiac Society · 2024
    Article
  10. Review
  11. Article
  12. Article
  13. Article
  14. Article
  15. Review
  16. Lungs From Donors ≥70 Years of Age for Transplantation-Do Long-Term Outcomes Justify Their Use?Transplant international : official journal of the European Society for Organ Transplantation · 2023
    Article
  17. Could global surgery overcome a decline in surgical cases?Annals of medicine and surgery (2012) · 2022
    Article
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

15 authors.

Zhizhou YangDivision of Cardiothoracic Surgery, Washington University School of Medicine, St Louis, Missouri.
Melanie P SubramanianDivision of Cardiothoracic Surgery, Washington University School of Medicine, St Louis, Missouri.
Yan YanDivision of Public Health Sciences, Washington University School of Medicine, St Louis, Missouri.
Bryan F MeyersDivision of Cardiothoracic Surgery, Washington University School of Medicine, St Louis, Missouri.
Benjamin D KozowerDivision of Cardiothoracic Surgery, Washington University School of Medicine, St Louis, Missouri.
G Alexander PattersonDivision of Cardiothoracic Surgery, Washington University School of Medicine, St Louis, Missouri.
Ruben G NavaDivision of Cardiothoracic Surgery, Washington University School of Medicine, St Louis, Missouri.
Ramsey R HachemDivision of Pulmonary and Critical Care Medicine, Washington University School of Medicine, St Louis, Missouri.
Chad A WittDivision of Pulmonary and Critical Care Medicine, Washington University School of Medicine, St Louis, Missouri.
Michael K PasqueDivision of Cardiothoracic Surgery, Washington University School of Medicine, St Louis, Missouri.
Derek E ByersDivision of Pulmonary and Critical Care Medicine, Washington University School of Medicine, St Louis, Missouri.
Hrishikesh S KulkarniDivision of Pulmonary and Critical Care Medicine, Washington University School of Medicine, St Louis, Missouri.
Daniel KreiselDivision of Cardiothoracic Surgery, Washington University School of Medicine, St Louis, Missouri.
Akinobu ItohDivision of Cardiothoracic Surgery, Washington University School of Medicine, St Louis, Missouri.
Varun PuriDivision of Cardiothoracic Surgery, Washington University School of Medicine, St Louis, Missouri. Electronic address: varunpuri@wustl.edu.

Funding

Washington University Center for Cellular ImagingP30CA091842 · NCI · WASHINGTON UNIVERSITY · PI AIMEE S JAMES · 2001 to 2026
$128.0M
Optimizing Donor Management in Lung TransplantationR01HL146856 · NHLBI · WASHINGTON UNIVERSITY · PI Ana Baumann Walker, Matthew Galen Hartwig · 2020 to 2026
$2.7M
NCI NIH HHS P30 CA091842NHLBI NIH HHS R01 HL146856
6 · The paper itself

Abstract

backgroundStudies in lung transplantation have shown variable association between hospital volume and clinical outcomes. We aimed to identify the pattern of effect of hospital volume on individual patient survival after lung transplantation.

methodsWe performed a retrospective analysis using the United Network for Organ Sharing national thoracic organ transplantation database. Adult patients who underwent lung transplantation between January 2013 and December 2017 were included. The association between mean annual center volume and 1-year overall survival was examined using restricted cubic splines in a random effects multivariable Cox model. The volume threshold for optimal 1-year overall survival was subsequently approximated by the maximum likelihood approach using segmented linear splines in the same model.

resultsThe study included 10,007 patients at 71 transplant centers. Median annual center volume was 22 cases (interquartile range, 10.6 to 38). A center volume threshold was identified at 33 cases per year (95% confidence interval, 28 to 37). Higher center volume, to 33 cases per year, was associated with better 1-year survival (hazard ratio 0.989, 95% confidence interval, 0.980 to 0.999 every additional case). Further increase in center volume above 33 cases per year showed no additional benefit (hazard ratio 1.000, 95% confidence interval, 0.996 to 1.003 every additional case). Twenty-three centers (32.4%) reached the volume threshold of 33 cases per year.

conclusionsOne-year survival after lung transplantation improved with increasing center volume to as many as 33 cases per year. Low volume centers below the 33 cases per year threshold had large variations in their outcomes and had a higher risk of performing poorly, although many of them maintained good performance.

Indexed as

Lung TransplantationAdultHumansLikelihood FunctionsProportional Hazards ModelsRetrospective StudiesTreatment Outcome

Identifiers

PMID33857492
PMCPMC8505551

What OpenQuestion holds

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Registered trials

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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.