A randomized trial of diagnostic strategies after normal proximal vein ultrasonography for suspected deep venous thrombosis: D-dimer testing compared with repeated ultrasonography.

Abstract:

BACKGROUND:With suspected deep venous thrombosis and normal results on proximal vein ultrasonography, a negative d-dimer result may exclude thrombosis and a positive D-dimer result may be an indication for venography. OBJECTIVE:To evaluate and compare the safety of 2 diagnostic strategies for deep venous thrombosis. DESIGN:Randomized, multicenter trial. SETTING:Four university hospitals. PATIENTS:810 outpatients with suspected deep venous thrombosis and negative results on proximal vein ultrasonography. INTERVENTIONS:Erythrocyte agglutination D-dimer testing followed by no further testing if the result was negative and venography if the result was positive (experimental) or ultrasonography repeated after 1 week in all patients (control). MEASUREMENTS:Symptomatic deep venous thrombosis diagnosed initially and symptomatic venous thromboembolism during 6 months of follow-up. RESULTS:Nineteen of 408 patients (4.7%) in the D-dimer group and 3 of 402 patients (0.7%) in the repeated ultrasonography group initially received a diagnosis of deep venous thrombosis (P < 0.001). During follow-up of patients without a diagnosis of deep venous thrombosis on initial testing, 8 patients (2.1% [95% CI, 0.9% to 4.0%]) in the D-dimer group and 5 patients (1.3% [CI, 0.4% to 2.9%]) in the repeated ultrasonography group developed symptomatic venous thromboembolism (difference, 0.8 percentage point [CI, -1.1 to 2.9 percentage points]; P > 0.2). Venous thromboembolism occurred in 1.0% (CI, 0.2% to 2.8%) of those with a negative D-dimer result. LIMITATIONS:Seventy patients (8.6%) deviated from the diagnostic protocols, and 9 patients (1.1%) had inadequate follow-up. CONCLUSION:In outpatients with suspected deep venous thrombosis who initially had normal results on ultrasonography of the proximal veins, a strategy based on D-dimer testing followed by no further testing if the result was negative and venography if the result was positive had acceptable safety and did not differ from the safety of a strategy based on withholding anticoagulant therapy and routinely repeating ultrasonography after 1 week.

journal_name

Ann Intern Med

authors

Kearon C,Ginsberg JS,Douketis J,Crowther MA,Turpie AG,Bates SM,Lee A,Brill-Edwards P,Finch T,Gent M

doi

10.7326/0003-4819-142-7-200504050-00007

subject

Has Abstract

pub_date

2005-04-05 00:00:00

pages

490-6

issue

7

eissn

0003-4819

issn

1539-3704

pii

142/7/490

journal_volume

142

pub_type

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