Evidence map›Paper›PMID 34610118›Full record

SynthesisBlood advances2022

von Willebrand factor levels in the diagnosis of von Willebrand disease: a systematic review and meta-analysis.

Mohamad A Kalot, Nedaa Husainat, Abdallah El Alayli, Omar Abughanimeh, Osama Diab, Sammy Tayiem, Bader Madoukh, Ahmad B Dimassi, Aref Qureini, Barbara Ameer and 13 more

Abstract readMeta-AnalysisSystematic Review
In one paragraph

Synthesis in Blood advances, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed, 1 pooled it
–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

16 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Seventh Åland Island Meeting on von Willebrand Disease.Haemophilia : the official journal of the World Federation of Hemophilia · 2026
    Article
  3. Review
  4. Review
  5. Review
  6. Review
  7. Review
  8. Article
  9. Low von Willebrand factor-unraveling an enigma wrapped in a conundrum.Journal of thrombosis and haemostasis : JTH · 2024
    Review
  10. Review
  11. Review
  12. Article
  13. Review
  14. Article
  15. Article
  16. Perioperative Outcomes of Patients with Bleeding Disorders Undergoing Major Surgery at an Academic Hemophilia Treatment Center.Clinical and applied thrombosis/hemostasis : official journal of the International Academy of Clinical and Applied Thrombosis/Hemostasis
    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

23 authors.

Mohamad A KalotDepartment of Internal Medicine, State University of New York at Buffalo, Buffalo, NY.ORCID 0000-0002-6581-4561
Nedaa HusainatDepartment of Internal Medicine, St. Mary's Hospital, Saint Louis, MO.
Abdallah El AlayliOutcomes and Implementation Research Unit, Department of Nephrology and Hypertension, University of Kansas Medical Center, Kansas City, KS.
Omar AbughanimehDivision of Oncology and Hematology, University of Nebraska Medical Center - Fred & Pamela Buffett Cancer Center, Omaha, NE.ORCID 0000-0002-4189-5678
Osama DiabDepartment of Hematology.
Sammy TayiemDepartment of Internal Medicine, University of Kansas Medical Center, Kansas City, KS.
Bader MadoukhDepartment of Internal Medicine, State University of New York - Upstate Medical University, Syracuse, NY.
Ahmad B DimassiDepartment of Internal Medicine, Lebanese American University, Achrafiye, Beirut, Lebanon.ORCID 0000-0002-7671-9965
Aref QureiniDepartment of Internal Medicine, UT Rio Grande Valley, Edinburg, TX.
Barbara AmeerDepartment of Medicine, Rutgers-Robert Wood Johnson Medical School, New Brunswick, NJ.ORCID 0000-0002-8740-9989
Jeroen C J EikenboomDivision of Thrombosis and Hemostasis, Department of Internal Medicine, Leiden University Medical Center, Leiden, The Netherlands.
Nicolas GiraudAssociation française des hémophiles (AFH), Paris, France.
Claire McLintockDepartment of Hematology, Auckland City Hospital, Grafton, Auckland, New Zealand.
Simon McRaeRoyal Adelaide Hospital, Adelaide, SA, Australia.
Robert R MontgomeryVersiti - Blood Center of Wisconsin, Milwaukee, WI.
James S O'DonnellIrish Centre for Vascular Biology, Royal College of Surgeons in Ireland, Dublin, Ireland.ORCID 0000-0003-0309-3313
Nikole ScappeNational Hemophilia Foundation, New York, NY.
Robert F SidonioAflac Cancer and Blood Disorders, Emory University, Atlanta, GA.
Romina Brignardello-PetersenFaculty of Health Sciences, McMaster University, Hamilton, ON, Canada.ORCID 0000-0002-6010-9900
Veronica H FloodDivision of Hematology/Oncology, Department of Pediatrics, Medical College of Wisconsin, Wauwatosa, WI.
Nathan T ConnellBrigham and Women's Hospital and Harvard Medical School, Boston, MA; and.ORCID 0000-0003-4100-7826
Paula D JamesDepartment of Medicine, Queen's University, Kingston, ON, Canada.ORCID 0000-0003-4649-9014
Reem A MustafaOutcomes and Implementation Research Unit, Department of Nephrology and Hypertension, University of Kansas Medical Center, Kansas City, KS.ORCID 0000-0002-2091-0875

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

von Willebrand disease (VWD) is associated with significant morbidity as a result of excessive mucocutaneous bleeding. Early diagnosis and treatment are important to prevent and treat these symptoms. We systematically reviewed the accuracy of diagnostic tests using different cutoff values of von Willebrand factor antigen (VWF:Ag) and platelet-dependent von Willebrand factor (VWF) activity assays in the diagnosis of VWD. We searched Cochrane Central Register for Controlled Trials, MEDLINE, and Embase databases for eligible studies. We pooled estimates of sensitivity and specificity and reported patient-important outcomes when relevant. This review included 21 studies that evaluated VWD diagnosis. The results showed low certainty in the evidence for a net health benefit from reconsidering the diagnosis of VWD vs removing the disease diagnosis in patients with VWF levels that have normalized with age. For the diagnosis of type 1 VWD, VWF sequence variants were detected in 75% to 82% of patients with VWF:Ag < 0.30 IU/mL and in 44% to 60% of patients with VWF:Ag between 0.30 and 0.50 IU/mL. A sensitivity of 0.90 (95% confidence interval [CI], 0.83-0.94) and a specificity of 0.91 (95% CI, 0.76-0.97) were observed for a platelet-dependent VWF activity/VWF:Ag ratio < 0.7 in detecting type 2 VWD (moderate certainty in the test accuracy results). VWF:Ag and platelet-dependent activity are continuous variables that are associated with an increase in bleeding risk with decreasing levels. This systematic review shows that using a VWF activity/VWF:Ag ratio < 0.7 vs lower cutoff levels in patients with an abnormal initial VWD screen is more accurate for the diagnosis of type 2 VWD.

Indexed as

von Willebrand Diseasesvon Willebrand Disease, Type 1Blood Coagulation TestsHemorrhageHumansvon Willebrand Factorvon Willebrand Factor

Identifiers

PMID34610118
PMCPMC8753202

What OpenQuestion holds

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LicenceCC BY-NC-ND
Read underepoch 390

Registered trials

None linked

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.