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Volume tests for chronic venous insufficiency: an appraisal
E C Peirce1, K Chiang, H Schanzer
1Department of Surgery, Mount Sinai School of Medicine, City University of New York, N.Y.
Surgery
|May 1, 1991
Summary
Noninvasive limb volume tests for chronic venous disease can be improved. Normalizing for arterial inflow and using elevation tests significantly enhance accuracy in detecting venous regurgitation.
Area of Science:
- Vascular Surgery
- Medical Diagnostics
- Biomedical Engineering
Background:
- Chronic venous disease (CVD) management increasingly involves surgical interventions.
- Noninvasive limb volume tests are crucial for patient selection and outcome assessment in CVD.
- Current methods often overlook arterial inflow confounding and lack rigorous validation.
Purpose of the Study:
- To statistically validate limb volume tests for CVD.
- To assess the impact of arterial inflow on volume measurements.
- To determine the sensitivity and specificity of exercise and elevation tests for detecting venous regurgitation.
Main Methods:
- Measured limb volume changes using strain gauges during exercise and elevation in 29 control and 35 CVD limbs.
- Normalized volume changes for arterial inflow to calculate regurgitation rate.
- Determined normal confidence limits and assessed test specificity and sensitivity.
Main Results:
- Arterial inflow significantly confounded volume curves.
- Normalization of data significantly improved test specificity and sensitivity.
- Elevation tests demonstrated higher sensitivity for regurgitation detection compared to normalized calf exercise tests.
- Calf exercise tests, even normalized, were insufficiently sensitive for reliable regurgitation assessment but provided calf muscle pump information.
Conclusions:
- Many current limb volume tests for CVD are unsuitable due to confounding factors.
- Normalization for regional arterial flow significantly enhances test accuracy.
- Elevation tests are more sensitive for measuring venous regurgitation in CVD.
- Improved limb volume testing protocols could enhance surgical patient selection and outcome evaluation.
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