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Original Article
Volume 329:1365-1369 November 4, 1993 Number 19
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A Comparison of Real-Time Compression Ultrasonography with Impedance Plethysmography for the Diagnosis of Deep-Vein Thrombosis in Symptomatic Outpatients
Harriet Heijboer, Harry R. Buller, Anthonie Lensing, Alexander Turpie, Louisa P. Colly, and Jan Wouter ten Cate

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ABSTRACT

Background Impedance plethysmography performed serially over a one-week period has been shown to be an effective diagnostic strategy for patients with clinically suspected acute deep-vein thrombosis. Compression ultrasonography has a high sensitivity and specificity for the detection of proximal-vein thrombosis. The clinical value of repeated ultrasonography in the management of symptomatic deep-vein thrombosis is unknown.

Methods We conducted a randomized trial in 985 consecutive outpatients with clinically suspected deep-vein thrombosis to compare the diagnostic value of serial impedance plethysmography (494 patients) and serial compression ultrasonography (491 patients). We compared the positive predictive values of both tests for the diagnosis of venous thrombosis, using contrast venography as a reference. The frequencies of venous thromboembolism during a six-month follow-up period were also compared in patients with repeatedly normal results in order to evaluate the safety of withholding anticoagulant therapy from such patients.

Results The positive predictive value of an abnormal ultrasonogram was 94 percent (95 percent confidence interval, 87 to 98 percent), whereas the predictive value of impedance plethysmography was 83 percent (95 percent confidence interval, 75 to 90 percent) (P = 0.02). In patients with repeatedly normal results, the incidence of venous thromboembolism during the six-month follow-up period was 1.5 percent (95 percent confidence interval, 0.5 to 3.3 percent) for serial compression ultrasonography, as compared with 2.5 percent (95 percent confidence interval, 1.2 to 4.6 percent) for serial impedance plethysmography.

Conclusions In making the diagnosis of deep-vein thrombosis in symptomatic outpatients, serial compression ultrasonography is preferable to impedance plethysmography, in view of its superior performance in detecting venous thrombosis.


Source Information

From the Center for Hemostasis, Thrombosis, Atherosclerosis and Inflammation Research, Academic Medical Center, Amsterdam (H.H., H.R.B., A.W.A.L., J.W.C.); the Hamilton Civic Hospitals General Division, Hamilton General Hospital-McMaster Clinic, Hamilton, Ont., Canada (A.W.A.L., A.G.G.T.); and the Thrombosis Service, Amsterdam (L.P.C.).

Address reprint requests to Dr. Buller at the Center for Hemostasis, Thrombosis, Atherosclerosis and Inflammation Research, Academic Medical Center, Meibergdreef 9, 1105 AZ Amsterdam Zuidoost, the Netherlands.

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Related Letters:

The Diagnosis of Deep-Vein Thrombosis
Moser K. M., Fedullo P. F., Heijboer H., Buller H. R., ten Cate J. W.
Extract | Full Text  
N Engl J Med 1994; 330:863-864, Mar 24, 1994. Correspondence

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