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Microcirculatory dysfunction in chronic venous insufficiency (CVI).

M Jünger1, A Steins, M Hahn

  • 1Department of Dermatology, University Hospital, Tübingen, Germany. michael.juenger@med.uni-tuebingen.de

Microcirculation (New York, N.Y. : 1994)
|January 11, 2001
PubMed
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Chronic venous insufficiency (CVI) causes microangiopathy, leading to skin problems and ulcers. Compression therapy improves microcirculation and capillary health in CVI patients.

Area of Science:

  • Vascular Biology
  • Dermatology
  • Medical Diagnostics

Background:

  • Chronic venous insufficiency (CVI) is characterized by elevated peripheral venous pressure, leading to macrocirculatory disturbances and microangiopathic changes.
  • These microcirculatory alterations are closely linked to skin trophic disorders and can progress to ulceration.
  • Understanding CVI-related microangiopathy is crucial for managing skin complications and preventing venous ulcer recurrence.

Purpose of the Study:

  • To investigate the microcirculatory changes in patients with chronic venous insufficiency (CVI) across different clinical stages.
  • To evaluate the impact of compression therapy on capillary morphology and microcirculation in CVI patients.
  • To assess the expression of leukocyte adhesion molecules in CVI patients during venous hypertension and their correlation with microangiopathy.

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Main Methods:

  • Utilized fluorescence video microscopy, intravital video capillaroscopy, transcutaneous oxygen partial pressure measurement (TcpO2), and laser Doppler flowmetry to examine microcirculation in 50 CVI patients.
  • Assessed the effects of 4-week compression stocking therapy on capillary morphology in 20 CVI patients (Widmer stages I-II).
  • Measured capillary pressure during simulated muscle contraction and analyzed leukocyte adhesion molecule expression (LFA-1, Mac-1, L-selectin, etc.) in blood samples from CVI patients and healthy controls under experimental venous hypertension.

Main Results:

  • Microangiopathic changes in CVI include decreased capillary count, altered capillary morphology, reduced skin oxygenation (TcpO2), increased capillary permeability, elevated subcutaneous flow, and diminished vascular reserve.
  • These microcirculatory impairments correlate directly with the clinical severity of CVI.
  • Compression therapy led to an increased number of nutritive capillaries and reduced capillary diameter, with faster ulcer healing associated with increased capillary proliferation.

Conclusions:

  • Microangiopathy precedes the development of skin trophic disorders in CVI, with dilated capillaries in seemingly normal skin indicating early perfusion issues.
  • The observed microcirculatory changes provide a plausible explanation for the development and recurrence of venous ulcers.
  • Effective therapeutic measures, such as compression therapy, demonstrably improve impaired skin microcirculation in the ankle area of CVI patients.