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Variability of venous-hemodynamics with daily activity
M L Katz1, A J Comerota, R P Kerr
1Department of Surgery, Temple University Hospital, Philadelphia, PA 19140.
Journal of Vascular Surgery
|February 1, 1994
Summary
Daily activity causes normal changes in venous hemodynamics due to valvular dysfunction, affecting diagnostic conclusions in 20% of healthy individuals. This highlights the need for careful venous testing.
Area of Science:
- Vascular Biology
- Human Physiology
Background:
- Venous hemodynamics are crucial for circulatory health.
- Understanding diurnal variations in venous function is important for accurate clinical assessment.
Purpose of the Study:
- To evaluate changes in venous hemodynamics in symptom-free volunteers due to daily activity.
- To assess the impact of daily activity on venous valvular function, calf muscle pump, and ambulatory venous pressure.
Main Methods:
- Prospective study of 25 healthy volunteers (male and female).
- Air plethysmography used to assess venous volumes, valvular function, calf muscle pump, and ambulatory venous pressure.
- Measurements taken in the morning and late afternoon over two days.
Main Results:
- Significant deterioration in venous valvular function (venous filling index) observed in the late afternoon compared to morning measurements (p=0.039).
- Shortened venous filling time (p=0.033) indicated progressive insufficiency, while venous volume remained unchanged (p=0.794).
- Calf muscle pump function and ambulatory venous pressures were constant; no gender-specific differences in daily activity effects were noted.
Conclusions:
- Daily activity induces normal venous hemodynamic changes, primarily due to developing valvular dysfunction.
- These changes can alter diagnostic interpretations in up to 20% of asymptomatic individuals.
- Findings necessitate careful consideration during venous testing and patient evaluation, with caution against extrapolating to patients with existing venous disease.