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Microvascular changes in venous disease: an update

A Bollinger1, A J Leu, U Hoffmann

  • 1Department of Medicine, University Hospital, Zurich, Switzerland.

Angiology
|January 1, 1997
PubMed
Summary
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Chronic venous insufficiency (CVI) involves microvascular changes like capillary damage and altered blood flow in the lower legs. These changes cause ischemia and edema, leading to skin damage and venous ulcers.

Area of Science:

  • Vascular Biology
  • Dermatology
  • Medical Physiology

Background:

  • Chronic venous insufficiency (CVI) is a prevalent condition affecting lower limb circulation.
  • Microvascular dysfunction is increasingly recognized as a key contributor to CVI pathophysiology.
  • Understanding these microvascular alterations is crucial for managing CVI complications.

Purpose of the Study:

  • To provide an overview of the microvascular involvement in chronic venous insufficiency.
  • To detail the specific microangiopathic changes observed in the lower legs of CVI patients.
  • To explain the relationship between microvascular alterations and the development of trophic changes and venous ulceration.

Main Methods:

  • Review of existing literature on microvascular changes in CVI.

Related Experiment Videos

  • Description of characteristic microangiopathic features: capillary morphology, thrombosis, permeability.
  • Measurement techniques discussed: transcutaneous oxygen tension (tcPO2), laser Doppler fluxmetry.

    • Main Results:

    • Microangiopathy in CVI includes enlarged/ramified capillaries, reduced capillary count, thrombosis, and increased microlymphatic permeability.
    • Decreased tcPO2 correlates with reduced perfused capillaries; laser Doppler flux is enhanced.
    • This paradox is explained by shunting in deeper layers and hypoperfusion in superficial nutritive vessels, with patchy distribution.

    Conclusions:

    • Microvascular ischemia and edema, driven by capillary permeability and lymphatic dysfunction, are primary causes of trophic changes and venous ulceration in CVI.
    • Targeting microvascular alterations may offer new therapeutic strategies for CVI.
    • Further research into the precise mechanisms of microvascular damage in CVI is warranted.