Titre
Microangiopathy of cutaneous blood and lymphatic capillaries in chronic venous insufficiency (CVI).
Type
article
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Périodique
The Yale journal of biology and medicine
Auteur(s)
Franzeck, U.K.
Auteure/Auteur
Haselbach, P.
Auteure/Auteur
Speiser, D.
Auteure/Auteur
Bollinger, A.
Auteure/Auteur
Liens vers les personnes
Liens vers les unités
ISSN
0044-0086
Statut éditorial
Publié
Date de publication
1993
Volume
66
Numéro
1
Première page
37
Dernière page/numéro d’article
46
Peer-reviewed
Oui
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Publication Status: ppublish
Résumé
The severity of microangiopathy in patients with chronic venous insufficiency (CVI) determines the extent of the trophic disturbances of the skin. Resulting from valvular incompetence of deep and/or perforating veins and the accompanying venous outflow obstruction caused by deep venous thrombosis (DVT), the increased ambulatory venous pressure heads are transmitted retrograde into the microvasculature of the skin at the ankle region. In the present study, we have assessed the changes in the cutaneous microvasculature by dynamic fluorescence video microscopy, fluorescence microlymphography, and transcutaneous oxygen tension (tcPO2) measurements. In mild forms of CVI, capillary density, morphologic characteristics, and tcPO2 are still normal. Fluorescent light intensity is, however, significantly increased, indicating an increased transcapillary diffusion of sodium fluorescein (NaF) as a marker for enhanced leakage of the capillaries in the early stage of the disease. The pericapillary halo diameters are significantly enlarged, compared to controls (p < 0.01). In the severe stages of CVI and in patients with venous ulcers, capillary thromboses, probably caused by endothelium-blood cell interactions, may lead to a reduced capillary density. In order to enlarge the exchange surface area, the remaining skin capillaries become tortuous (capillary tufts). Parallel to the reduced capillary number, tcPO2 decreases and can be extremely low at the ulcer rim or at white atrophy spots. Fibrin cuffs are not a specific finding for venous ulceration and do not significantly impair oxygen diffusion. Fluorescence microlymphography permits visualization of the lymphatic capillaries of the superficial skin. In severe stages of CVI, the lymphatic capillary network at the medial ankle area is destroyed, and the remaining lymphatic capillary fragments have an increased permeability to FITC-dextran with a molecular weight of 150,000. These findings demonstrate a special lymphatic microangiopathy in CVI, suggesting an additional lymphatic component in the edema formation.
Sujets
PID Serval
serval:BIB_CFF0918E8939
PMID
Date de création
2008-01-28T10:33:08.134Z
Date de création dans IRIS
2025-05-20T23:54:50Z
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Version du manuscrit
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Format
Adobe PDF
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