Quantification of venous reflux parameters using duplex scanning and air plethysmography
T Yamaki1, M Nozaki, H Sakurai
1Department of Plastic and Reconstructive Surgery, Tokyo Women's Medical University, Tokyo, Japan. yamaki@prs.twmu.ac.jp
Phlebology
|February 13, 2008
Summary
This study found that peak reflux velocity (PRV) and peak reflux flow (PRF) are better indicators of chronic venous insufficiency (CVI) severity than reflux time (RT). These parameters help differentiate between early and advanced CVI stages.
Area of Science:
- Vascular Medicine
- Medical Imaging
- Biomedical Engineering
Background:
- Chronic venous insufficiency (CVI) affects a significant portion of the population, leading to reduced quality of life.
- Accurate assessment of CVI severity is crucial for effective treatment and management.
- Duplex ultrasound and air plethysmography (APG) are key diagnostic tools for evaluating venous function.
Purpose of the Study:
- To compare duplex and APG-derived parameters in patients with early versus advanced CVI.
- To identify specific parameters that indicate the progression of CVI.
- To evaluate the efficacy of different duplex parameters in discriminating CVI severity.
Main Methods:
- A prospective study involving 574 patients (686 limbs) with varying stages of CVI, classified using the CEAP system.
- Duplex ultrasound assessed venous anatomy and parameters like reflux time (RT), peak reflux velocity (PRV), and peak reflux flow (PRF).
- Air plethysmography (APG) provided data on venous volume (VV), venous filling index (VFI), ejection fraction (EF), and residual volume fraction (RVF).
Main Results:
- No significant difference in overall superficial venous reflux between early and advanced CVI groups.
- VFI and RVF were significantly higher in secondary CVI compared to primary CVI.
- PRV and PRF demonstrated significant discrimination power for CVI severity at various anatomical locations, outperforming RT.
Conclusions:
- Superficial venous insufficiency plays a critical role in the development of advanced CVI.
- In secondary CVI, obstruction impacts RVF.
- PRV and PRF are superior to RT for quantifying venous valvular insufficiency and discriminating CVI clinical severity.
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