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Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation
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von Willebrand factor antigen and plasminogen activator inhibitor in giant cell arteritis

E Nordborg1, R Andersson, L Tengborn

  • 1Department of Rheumatology, University of Göteborg, Sweden.

Annals of the Rheumatic Diseases
|May 1, 1991
PubMed

Insights

Giant cell arteritis patients show elevated von Willebrand factor antigen (vWF:Ag) levels, which normalize over 18 months. However, vWF:Ag and plasminogen activator inhibitor activity have limited clinical value for diagnosis or monitoring.

Area of Science:

  • Rheumatology
  • Vascular Biology
  • Clinical Chemistry

Background:

  • Giant cell arteritis (GCA) is a systemic vasculitis affecting large arteries.
  • Biomarkers for GCA diagnosis, prognosis, and treatment monitoring are crucial.
  • Von Willebrand factor antigen (vWF:Ag) and plasminogen activator inhibitor (PAI) activity are potential markers.

Purpose of the Study:

  • To evaluate the clinical utility of vWF:Ag and PAI activity in GCA patients.
  • To assess changes in vWF:Ag and PAI activity during corticosteroid treatment.
  • To determine if these markers correlate with disease activity or complications.

Main Methods:

  • Serial measurements of vWF:Ag and PAI activity in 63 GCA patients.
  • Comparison with 201 age-matched controls from the general population.
  • Analysis of vWF:Ag and PAI activity in relation to clinical presentation and temporal artery biopsy results.

Main Results:

  • Mean vWF:Ag was significantly higher in GCA patients (2.63 IU/ml) than controls (1.71 IU/ml) before treatment.
  • vWF:Ag levels gradually decreased, reaching control range approximately 18 months post-diagnosis.
  • No significant difference in PAI activity was observed between patients and controls at any time point.
  • vWF:Ag did not correlate with clinical GCA subtypes, biopsy results, flare-ups, or vascular complications.

Conclusions:

  • vWF:Ag and PAI activity measurements offer limited clinical value for GCA diagnosis.
  • These markers are not useful for predicting prognosis or monitoring steroid treatment efficacy in GCA.
  • Further research may be needed to identify more reliable biomarkers for GCA.

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