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Deep venous thrombosis: longitudinal study with duplex US
1Department of Radiology, Rigshospitalet, University of Copenhagen, Denmark.
Insights
Deep venous thrombosis (DVT) in lower limbs often resolves within a year with anticoagulant therapy. Factors like lesion location and symptom duration influence DVT normalization and reduce long-term complications.
Area of Science:
- Vascular Medicine
- Diagnostic Imaging
Background:
- Deep venous thrombosis (DVT) is a significant vascular condition affecting lower limbs.
- Recurrent venous thrombosis and post-thrombotic syndrome are common complications.
Purpose of the Study:
- To investigate the natural course of deep venous thrombosis (DVT) in the lower limb.
- To identify predictors of venous normalization and long-term sequelae.
Main Methods:
- Prospective study of 49 patients with lower limb DVT.
- Repeated duplex ultrasound (US) assessments for at least 1 year.
- Standard anticoagulant therapy for 3 months.
Main Results:
- 36 out of 49 patients achieved venous normalization within 1 year.
- Factors favoring normalization include single-site lesions, unaffected pelvic veins, left leg DVT, nonocclusive clots, no prior DVT history, and symptom duration <24 hours.
- Shorter symptom duration (<24 hours) correlated with faster normalization (11 vs. 25 weeks).
- Early US normalization or regression at 3 months significantly reduced sequelae rates (6% vs. 83%).
Conclusions:
- Lower limb DVT frequently normalizes within a year with standard treatment.
- Specific clinical and ultrasound findings predict favorable outcomes.
- Early detection of DVT resolution via ultrasound can mitigate long-term complications.
Abstract:
Forty-nine patients with deep venous thrombosis (DVT) of the lower limb were studied with repeated duplex ultrasound (US) for at least 1 year or until the vein became normal at US. Standard anticoagulant therapy was given for 3 months. In 36 patients, the veins became normal within 1 year. The likelihood of normalization increased if the lesion was located in only one site, if the pelvic veins were unaffected, if the affected leg was the left one, if the initial clot was nonocclusive, if there was no history of DVT, and if the symptoms had lasted less than than 24 hours. The average time before normalization was shorter if the symptoms had lasted less than 24 hours, that is, 11 weeks versus 25 weeks (P less than .02). The rate of sequelae at 1 year was lower if the US scan was normal or showed regression at 3 months, 6% versus 83% (P less than .00005).