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[D-dimers measurement to predict the risk of thromboembolic recurrence]
1Division d'angiologie et d'hémostase, hôpitaux universitaires de Genève, 24, rue Micheli-du-Crest, 1211 Genève, Suisse. Marc.Righini@hcuge.ch
Insights
Determining the optimal duration for anticoagulant therapy after a first venous thromboembolism (VTE) event remains challenging. While D-dimer tests show high negative predictive value for recurrence risk, their positive predictive value is limited, necessitating further research for better risk stratification.
Area of Science:
- Cardiology
- Hematology
- Thrombosis Research
Context:
- Optimal duration of anticoagulant therapy post-venous thromboembolism (VTE) is debated.
- Current recommendations rely on clinical characteristics of the initial event.
- D-dimer testing is emerging as a tool for personalized risk assessment.
Purpose:
- To evaluate the utility of D-dimer testing in predicting VTE recurrence.
- To identify optimal strategies for tailoring anticoagulant therapy duration.
- To address the gap in identifying high-risk patients who benefit from extended anticoagulation.
Summary:
- Four studies indicate D-dimer tests have high negative predictive value (>92%) for VTE recurrence.
- One randomized study showed an abnormal D-dimer test increased recurrence risk by 2.27-fold after stopping anticoagulation.
- Limited positive predictive value of D-dimer suggests caution in its application for guiding extended therapy.
Impact:
- Highlights the need for improved diagnostic tools to identify high-risk VTE patients.
- Suggests D-dimer testing alone may not be sufficient for guiding long-term anticoagulant decisions.
- Emphasizes the need for standardization in D-dimer testing protocols, including cut-offs and timing.
Purpose:
The optimal duration of anticoagulant therapy after a first episode of venous thromboembolism (VTE) is still matter of debate. Currently, the duration of anticoagulation is recommended on the basis of the clinical characteristics of the index event. In particular, the seventh ACCP conference on antithrombotic and thrombolytic therapy suggests that events secondary to a reversible risk factor should anticoagulated for shorter period of time than idiopathic VTE. Recently, D-dimer measurement has been used to predict the risk of recurrence and to tailor anticoagulant therapy on an individual basis.
Current Knowledge And Key Points:
Four studies used various D-dimer tests at various cut-off to predict the risk of recurrence after a first VTE event. Overall, these studies confirmed that D-dimer measurement has a high negative predictive value (>92%) to predict the risk of a recurrent VTE event. One intervention randomized study confirmed that in patients who stopped anticoagulation, the adjusted hazard ratio for a recurrent event among those with an abnormal D-dimer test, as compared with those with a normal test was of 2.27 (95% CI:1.15-4.46).
Future Prospects And Projects:
The missing gap remains to find a test able to detect patients at high risk of recurrence in whom maintaining anticoagulation would be beneficial. The limited positive predictive value of D-dimer reported in all studies suggests that the D-dimer test will have limited value in this field. Moreover, standardization of the cut-off and of the time of blood sampling in relation to cessation of anticoagulation is warranted.
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