Evolution of deep venous thrombosis: a prospective evaluation with US

Area of Science:

• Vascular Medicine
• Diagnostic Imaging
• Radiology

Background:

• Acute deep venous thrombosis (DVT) diagnosis relies on duplex ultrasound (US).
• Persistence of venous abnormalities after acute DVT requires further investigation.
• Distinguishing acute from chronic DVT on US can be challenging.

Purpose of the Study:

• To prospectively assess the persistence of venous abnormalities in asymptomatic patients with acute DVT.
• To evaluate the utility of serial duplex US in characterizing chronic venous changes.
• To determine if chronic changes can mimic acute DVT findings on compression US.

Main Methods:

• Prospective follow-up of 46 patients with confirmed acute DVT using serial duplex US.
• Assessment of venous abnormalities, including diameter and echogenicity, over a 6-month period.
• Evaluation of compression US findings for persistent abnormalities mimicking acute DVT.

Main Results:

• Isolated popliteal DVT showed a higher likelihood of normalization compared to femoral and popliteal DVT.
• Increased venous diameter was a significant indicator of acute clot.
• Chronic changes, including recanalization and persistent occlusion, mimicked acute DVT findings in 48% of patients with initial occlusive thrombosis.

Conclusions:

• Chronic venous changes after DVT can present with findings similar to acute DVT on compression US.
• These chronic changes, such as intimal thickening or persistent occlusion, should not be misdiagnosed as acute DVT.
• Establishing a baseline US appearance through follow-up examinations at 6 months is crucial for accurate DVT assessment.