Obesity and impaired venous function.
A M van Rij1, C S De Alwis, P Jiang
1Department of Surgery, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand. andre.vanrij@stonebow.otago.ac.nz
Summary
Obese patients exhibit more severe venous disease, with worse venous reflux but better muscle pump function compared to normal-weight individuals. Increased weight correlates with higher venous pressures and larger superficial femoral vein diameter.
Area of Science:
- Vascular Medicine
- Phlebology
- Obesity Medicine
Background:
- Clinical severity of venous disease is often exacerbated in obese patients.
- Understanding the impact of obesity on lower limb venous physiology is crucial for effective management.
Purpose of the Study:
- To compare lower limb venous physiology between obese and normal-weight patients using air plethysmography.
- To evaluate the influence of posture on venous measures and foot vein pressure in a cohort with varying body weights.
Main Methods:
- Air plethysmography and duplex scanning assessed venous function in 934 patients (obese vs. non-obese).
- A subgroup of 20 patients had foot vein pressures and femoral vein diameter measured in different postures (standing, sitting, lying, ambulating).
Main Results:
- Obese patients presented with more advanced clinical venous disease (CEAP C5&6: 35.4% vs. 20.5%).
- Obesity was associated with worse venous reflux but improved muscle pump function and reduced residual volumes.
- Higher body weight correlated with increased superficial femoral vein diameter, ambulatory venous pressure, venous filling index, and ejection volume, with greater foot venous pressure in obese individuals.
Conclusions:
- Obese patients demonstrate a more advanced clinical stage (CEAP) of venous disease compared to non-obese individuals with similar anatomical patterns of venous incompetence.
- Elevated intra-abdominal pressure in obese individuals may contribute to increased venous reflux, vein diameter, and pressures.
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