Document Detail


Local oxygen content in the skin is increased in chronic venous incompetence.
MedLine Citation:
PMID:  10625576     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In skin lesions of chronic venous incompetence (CVI) transcutaneous oxygen pressure (tcpO(2)) at the ankle is often reduced. However, in some CVI patients the tcpO(2) during suprasystolic occlusion remains significantly higher than in healthy subjects. The aim of the present study was to investigate which kind of CVI patients develop this phenomenon and whether the higher tcpO(2) during occlusion is caused by a smaller oxygen consumption of the skin or by an increased local oxygen content. The oxygen consumption of the skin was measured by the pO(2) decrease (DeltatcpO(2)/Deltat) after stopping the arterial oxygen supply when the hemoglobin was saturated by oxygen inhalation, i.e., at tcpO(2) values above 120-130 mmHg. By multiplying the tcpO(2) with the mean oxygen solubility coefficient of the skin the content of physically dissolved oxygen is obtained. The decrease of tcpO(2) in the 55- to 45-mmHg range indicates the consumption of oxygen physically dissolved and chemically bound to hemoglobin. It gave a parameter for estimating the local hemoglobin content of the skin. These values and the minimal tcpO(2) after a 5-min arterial occlusion were measured in 14 healthy subjects, in 13 patients with varicose veins, but no skin lesions, in 10 patients with CVI lesions like white atrophy and lipodermatosclerosis and in 16 CVI patients with open venous ulcers. During suprasystolic occlusion tcpO(2) at the ankle remained significantly higher in CVI patients with skin lesions than in the healthy control subjects (25.6 +/- 18.9 versus 8.0 +/- 7.0 mmHg). The steepness of the tcpO(2) decrease caused by cutaneous oxygen consumption in healthy subjects was not significantly different from the CVI patients. In contrast, the decrease of tcpO(2) at the ankle between 55 and 45 mmHg was 1.9 +/- 2.0 mmHg/s in the control group and 0.7 +/- 0.5 mmHg/s in the group with open venous ulcers. These results indicate a higher hemoglobin content in the skin of the CVI patients than in healthy subjects. Obviously, the hemoglobin bound oxygen content in the skin of CVI patients is increased. Thus, a lack of oxygen is unlikely to be the primary reason for the development of skin lesions in CVI.
Authors:
M Stücker; M Falkenberg; T Reuther; P Altmeyer; D W Lübbers
Related Documents :
445716 - Oxygen consumption and hemodynamic response of exercises used in training of patients w...
18085266 - Quantitative analysis of the oxygen transfer in the human acinus.
3746196 - Influence of oxygen on the heartbeat rhythm of the leech.
1798376 - Muscle mass effect on arterial desaturation after maximal exercise.
262576 - Comprehensive analysis of exertional ecg changes before and after oral propranolol.
7698136 - Absence of effect on exercise capacity of 12-weeks treatment with ramipril in patients ...
Publication Detail:
Type:  Clinical Trial; Controlled Clinical Trial; Journal Article    
Journal Detail:
Title:  Microvascular research     Volume:  59     ISSN:  0026-2862     ISO Abbreviation:  Microvasc. Res.     Publication Date:  2000 Jan 
Date Detail:
Created Date:  2000-02-25     Completed Date:  2000-02-25     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0165035     Medline TA:  Microvasc Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  99-106     Citation Subset:  IM    
Copyright Information:
Copyright 2000 Academic Press.
Affiliation:
Department of Dermatology, Ruhr-University, Bochum, Germany.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Administration, Inhalation
Adult
Aged
Aged, 80 and over
Ankle / blood supply
Blood Gas Analysis
Capillaries / physiology
Cell Count
Chronic Disease
Forearm / blood supply
Hemoglobins / metabolism
Humans
Middle Aged
Models, Biological
Oxygen / administration & dosage,  metabolism*
Oxygen Consumption / physiology
Partial Pressure
Photoplethysmography
Skin / blood supply*,  metabolism*
Venous Insufficiency / metabolism*
Chemical
Reg. No./Substance:
0/Hemoglobins; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Endothelin and free radicals modulate microvascular responses in streptozotocin-induced diabetic rat...
Next Document:  Hypoxia, metabolic inhibition, and isolated rat mesenteric tone: influence of arterial diameter.