Evidence map›Paper›PMID 33750409›Full record

ArticleThrombosis journal2021

Proximal deep vein thrombosis and pulmonary embolism in COVID-19 patients: a systematic review and meta-analysis.

Gregoire Longchamp, Sara Manzocchi-Besson, Alban Longchamp, Marc Righini, Helia Robert-Ebadi, Marc Blondon

Open access · goldAbstract read
In one paragraph

Article in Thrombosis journal, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed, 3 pooled it
10.5field-weighted citation impact, top 1% of its field
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

27 citing papers in PubMed, 3 syntheses or guidelines pooled it, 63 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Pooled it
  4. Trial
  5. Article
  6. Deep Vein Thrombosis in Critically Ill Patients With COVID-19 Pneumonia: Incidence, Wells Score Diagnostic Performance, and Hospital Prognosis.Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine · 2026
    Observational
  7. Article
  8. Evaluation of the IMPROVE-DD score in COVID-19 patients submitted to venous thromboembolism investigation at a hospital in Brazil.Jornal brasileiro de pneumologia : publicacao oficial da Sociedade Brasileira de Pneumologia e Tisilogia · 2025
    Article
  9. Review
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  15. Cochrane Corner: The use of anticoagulants in patients hospitalised with COVID-19.The Southern African journal of critical care : the official journal of the Critical Care Society · 2023
    Article
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  18. Observational
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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

6 authors at 2 institutions in 1 country.

Gregoire LongchampDepartment of Visceral Surgery, Faculty of Medicine and Geneva University Hospitals, Geneva, Switzerland.ORCID http://orcid.org/0000-0003-0031-4707
Sara Manzocchi-BessonDivision of Angiology and Haemostasis, Geneva University Hospitals and Faculty of Medicine, Rue Gabrielle-Perret-Gentil 4, 1205, Geneva, Switzerland.
Alban LongchampDepartment of Vascular Surgery, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland.
Marc RighiniDivision of Angiology and Haemostasis, Geneva University Hospitals and Faculty of Medicine, Rue Gabrielle-Perret-Gentil 4, 1205, Geneva, Switzerland.
Helia Robert-EbadiDivision of Angiology and Haemostasis, Geneva University Hospitals and Faculty of Medicine, Rue Gabrielle-Perret-Gentil 4, 1205, Geneva, Switzerland.
Marc BlondonDivision of Angiology and Haemostasis, Geneva University Hospitals and Faculty of Medicine, Rue Gabrielle-Perret-Gentil 4, 1205, Geneva, Switzerland. marc.blondon@hcuge.ch.
University Hospital of Geneva · CHUniversity Hospital of Lausanne · CH

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundCOVID-19 appears to be associated with a high risk of venous thromboembolism (VTE). We aimed to systematically review and meta-analyze the risk of clinically relevant VTE in patients hospitalized for COVID-19.

methodsThis meta-analysis included original articles in English published from January 1st, 2020 to June 15th, 2020 in Pubmed/MEDLINE, Embase, Web of science, and Cochrane. Outcomes were major VTE, defined as any objectively diagnosed pulmonary embolism (PE) and/or proximal deep vein thrombosis (DVT). Primary analysis estimated the risk of VTE, stratified by acutely and critically ill inpatients. Secondary analyses explored the separate risk of proximal DVT and of PE; the risk of major VTE stratified by screening and by type of anticoagulation.

resultsIn 33 studies (n = 4009 inpatients) with heterogeneous thrombotic risk factors, VTE incidence was 9% (95%CI 5-13%, I

conclusionsThe risk of major VTE among COVID-19 inpatients is high but varies greatly with severity of the disease. These findings reinforce the need for the use of thromboprophylaxis in all COVID-19 inpatients and for clinical trials testing different thromboprophylaxis regimens in subgroups of COVID-19 inpatients.

trial registrationThe review protocol was registered in PROSPERO International Prospective Register of Systematic Reviews ( CRD42020193369 ).

Indexed as

CoronavirusThrombosis pulmonary embolismVenous thromboembolism

Identifiers

PMID33750409
PMCPMC7942819
OpenAlexW3139276709

What OpenQuestion holds

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LicenceCC BY
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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.