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Semin Thromb Hemost 2000; 26(6): 643-656
DOI: 10.1055/s-2000-13219
Copyright © 2000 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA. Tel.: +1(212) 584-4662

Assessment of Deep Vein Thrombosis or Pulmonary Embolism by the Combined Use of Clinical Model and Noninvasive Diagnostic Tests

Philip S. Wells1 , David R. Anderson2 , Jeffrey Ginsberg3
  • Dr. Wells is a Research Scholar of the Canadian Heart and Stroke Foundation, Ottawa, Canada, and Dr. Ginsberg is a Career Investigator of the Heart and Stroke Foundation of Ontario, Toronto, Ontario, Canada. From the
  • 1Department of Medicine, Ottawa Hospital and the University of Ottawa, Ottawa, Ontario, Canada
  • 2Departments of Medicine and Pathology, QEII Health Sciences Centre Dalhousie University, Halifax, Nova Scotia, Canada
  • 3McMaster University, Hamilton, Ontario, Canada
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Publikationsverlauf

Publikationsdatum:
31. Dezember 2000 (online)

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ABSTRACT

Deep vein thrombosis (DVT) and pulmonary embolism (PE) are relatively common diseases and are amenable to therapy but with a potentially fatal outcome if untreated. The diagnosis can be made in most patients with use of the noninvasive imaging tests, but limitations exist. The standard first choice of investigation in patients with suspected DVT is compression ultrasonography (CUS). As with all tests, there is a potential for false-positive and false-negative results. The latter are especially an issue for calf vein thrombi, and this in part has led to the concept of serial CUS testing of the proximal venous system and not imaging of the calf. The premise of the repeat (serial) CUS test is that only thrombi that extend to the proximal system are clinically relevant, and these thrombi will be detected during subsequent testing. However, despite the safety of the serial CUS testing concept, it is inconvenient and expensive. The standard first choice of investigation in patients with suspected PE, the ventilation-perfusion (V/Q) lung scan is nondiagnostic in most cases. In the past few years, the diagnostic process has improved because of the validation of clinical models that accurately categorize patients as having low (5%), moderate (20% to 30%), or high probability (> 60%) for venous thromboembolic disease. Among the improvements this provides is the elimination of serial CUS testing if the ultrasound results are normal and the clinical probability is low in patients with suspected DVT. In patients with suspected PE in whom further testing is necessary, determination of clinical probability allows selection of invasive (angiography) or noninvasive testing (serial ultrasound) in patients with non-high-probability V/Q scans. The fibrin degradation product D-dimer has had a high negative predictive value; negative results with enzyme-linked immunosorbent assay (ELISA) tests effectively rule out DVT or PE. In addition, a negative result with less-sentive D-dimer testing and a low clinical probability excludes DVT or PE.

KEYWORD

Venous thrombosis - pulmonary embolism - diagnostic tests - D-dimer - algorithms

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