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
Background Impedance plethysmography performed serially overa one-week period has been shown to be an effective diagnosticstrategy for patients with clinically suspected acute deep-veinthrombosis. Compression ultrasonography has a high sensitivityand specificity for the detection of proximal-vein thrombosis.The clinical value of repeated ultrasonography in the managementof symptomatic deep-vein thrombosis is unknown.
Methods We conducted a randomized trial in 985 consecutive outpatientswith clinically suspected deep-vein thrombosis to compare thediagnostic value of serial impedance plethysmography (494 patients)and serial compression ultrasonography (491 patients). We comparedthe positive predictive values of both tests for the diagnosisof venous thrombosis, using contrast venography as a reference.The frequencies of venous thromboembolism during a six-monthfollow-up period were also compared in patients with repeatedlynormal results in order to evaluate the safety of withholdinganticoagulant therapy from such patients.
Results The positive predictive value of an abnormal ultrasonogramwas 94 percent (95 percent confidence interval, 87 to 98 percent),whereas the predictive value of impedance plethysmography was83 percent (95 percent confidence interval, 75 to 90 percent)(P = 0.02). In patients with repeatedly normal results, theincidence of venous thromboembolism during the six-month follow-upperiod was 1.5 percent (95 percent confidence interval, 0.5to 3.3 percent) for serial compression ultrasonography, as comparedwith 2.5 percent (95 percent confidence interval, 1.2 to 4.6percent) for serial impedance plethysmography.
Conclusions In making the diagnosis of deep-vein thrombosisin symptomatic outpatients, serial compression ultrasonographyis preferable to impedance plethysmography, in view of its superiorperformance 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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