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The Value of D-dimer in the Detection of Early Deep-vein Thrombosis After Total Knee Arthroplasty in Asian Patients: a Cohort Study

Overview
Journal Thromb J
Publisher Biomed Central
Date 2008 May 29
PMID 18505594
Citations 20
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Abstract

Background And Purpose: The relationship of D-dimer and deep-vein thrombosis (DVT) after total knee arthroplasty (TKA) remains controversial. The purpose of this study was to assess the value of D-dimer in the detection of early DVT after TKA.

Methods: The measurements of plasma D-dimer level were obtained preoperatively and at day 7 postoperatively in 78 patients undergoing TKA. Ascending venography was performed in 7 to 10 days after surgery. The plasma D-dimer levels were correlated statistically with the venographic DVT.

Results: Venographic DVT was identified in 40% of patients. High plasma D-dimer level >2.0 mug/ml was found in 68% of patients with DVT and 45% without DVT (P < 0.05). Therefore, high D-dimer level greater than 2.0 mug/ml showed 68% sensitivity, 55% specificity, 60% accuracy, 50% positive predictive rate and 72% negative predictive rate in the detection of early DVT after TKA.

Conclusion: High plasma D-dimer level is a moderately sensitive, but less specific marker in the detection of early of DVT after TKA. Measurement of serum D-dimer alone is not accurate enough to detect DVT after TKA. Venography is recommended in patients with elevated D-dimer and clinically suspected but asymptomatic DVT after TKA.

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