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[Rheologic particulars of venous flow. Physiopathologic consequences]
A Larcan1, M C Laprevote-Heully, J F Stoltz
1Service de réanimation, CHR de Nancy.
Journal Des Maladies Vasculaires
|January 1, 1989
Summary
High blood viscosity, particularly red cell aggregation, contributes to venous issues like thrombosis and insufficiency. Therapeutic interventions targeting hyperviscosity can disrupt this harmful cycle.
Area of Science:
- Physiology
- Biophysics
Context:
- Venous flow properties are influenced by hemorheological parameters.
- Postcapillary venules exhibit low shear rates and high blood viscosity.
- Red blood cell aggregation significantly impacts blood viscosity, especially at low shear rates.
Purpose:
- To elucidate the role of hemorheological parameters in venous flow.
- To understand the contribution of red cell aggregation to blood viscosity.
- To explore the consequences of microcirculatory stasis and its impact on cellular function.
Summary:
- Elevated red cell aggregation, seen in conditions like venular insufficiency and deep venous thrombosis, increases blood viscosity.
- Microcirculatory stasis in capillaries impairs oxygen supply, reduces ATP levels, and compromises platelet and white blood cell function.
- A vicious cycle of stasis promoting hyperviscosity, leading to further stasis, is implicated in venous pathologies.
Impact:
- Highlights the critical role of hemorheology in understanding venous diseases.
- Suggests therapeutic strategies like hemodilution and fibrinolytic drugs to break the pathological cycle.
- Provides insights into the microrheological basis of venous insufficiency and thrombosis.