varicose ulcer/نقص الأكسجة

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Pericapillary fibrin deposits and skin hypoxia precede the changes of lipodermatosclerosis in limbs at increased risk of developing a venous ulcer.

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This study investigated the possibility that pericapillary fibrin deposition, found in the calf skin of patients with venous ulceration and lipodermatosclerosis, might already be present in the dermis of the gaiter area of apparently healthy limbs before any skin changes were visible. The apparently

[Hyperemic hypoxia in venous ulcer].

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Venous ulcers of the lower limb: Where do we stand?

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Venous ulcers are the most common ulcers of the lower limb. It has a high morbidity and results in economic strain both at a personal and at a state level. Chronic venous hypertension either due to primary or secondary venous disease with perforator paucity, destruction or incompetence resulting in

Microangiopathy of split-skin grafts in venous ulcers.

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BACKGROUND In patients with chronic venous insufficiency, microangiopathy of blood and lymph capillaries caused by venous hypertension plays a major role in the development of venous ulceration. Conservative treatment of venous leg ulcers often fails, and split-skin grafting is sometimes

The venous ulcer continues to be a clinical challenge: an update.

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Venous ulcers are a common chronic problem in many countries especially in Northern Europe and USA. The overall prevalence of this condition is 1% rising to 3% in the over 65 years of age. Over the last 25 years, there have been many developments applicable to its diagnosis and treatment. These

[Local tissue hypoxia consequence in the trophic venous ulceration in elderly patients].

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This paper analyzes the data of examination and the results of the treatment of 25 patients aged over 80 years (mean age 68.5+/-7 years) suffering from varicosity with long nonhealing trophic ulcers of the distal limb segments (CVI CMP C6) and 20 patients of the same age groups with CVI CEAP stages

[Local tissue changes in venous ulcers of the leg].

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Authors investigated anaerobic metabolites (lactate, pyruvate), gas analyzes, pathohistological changes (light and electron microsc.) and regulatory agents in the local blood of venous ulcers. The cause of anaerobic disturbance is hypoxia and hypercapnia (hypostatic ulcers) and pathologic

Hyperglycemia regulates hypoxia-inducible factor-1alpha protein stability and function.

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Hyperglycemia and hypoxia are suggested to play essential pathophysiological roles in the complications of diabetes, which may result from a defective response of the tissues to low oxygen tension. In this study, we show that in primary dermal fibroblasts and endothelial cells, hyperglycemia

Oxidative stress mediates chemical hypoxia-induced injury and inflammation by activating NF-κb-COX-2 pathway in HaCaT cells.

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Hypoxia of skin is an important physiopathological process in many diseases, such as pressure ulcer, diabetic ulcer, and varicose ulcer. Although cellular injury and inflammation have been involved in hypoxia-induced dermatic injury, the underlying mechanisms remain largely unknown. This study was

Venous ulcer fibroblasts compared with normal fibroblasts show differences in collagen but not fibronectin production under both normal and hypoxic conditions.

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Previous immunocytochemical analysis showed that the base of venous ulcers was deficient in fibronectin compared with surrounding "normal" dermis. Here, we investigate whether impaired synthetic ability of ulcer fibroblasts could underlie this observation. Ulcer fibroblasts, established in culture

Expression of cyclooxygenase isoforms in normal human skin and chronic venous ulcers.

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Chronic venous ulcers are an example of abnormal wound healing showing chronic inflammation which together with the underlying vascular pathology results in delayed healing. Prostaglandins are among the most important mediators of inflammation. They have proinflammatory effects, predominantly by

[Pathogenesis of the venous leg ulcer].

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Based on different experimental findings, the following sequence of pathogenetically important factors for the development of venous ulcers is outlined: Valvular incompetence, reflux----chronic venous ambulatory hypertension----capillary dilatation and deformation----hyperemia----increased

Chronic problem wounds.

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Chronic problem wounds can result from both local and systemic factors that impair wound healing. The only way to achieve successful closure of these wounds is by an accurate diagnosis based on a thorough history, careful physical examination, optimal wound care, control of systemic and/or local

[Non-invasive measurement of skin oxygenation in chronic ulcers of the lower extremities].

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Transcutaneous pO2 measurement by polarography is a non-invasive method already used in internal medicine and in angiology. It has been employed in patients suffering from chronic lower limb ulcerations of various origins. Marked hypoxia was found in venous ulcers without arterial occlusive disease

[Pulmonary complications in adult sickle cell disease].

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Sickle cell disease is an autosomal genetic condition which represents the most frequent genetic disease in Île-de-France and Caribbean islands. The main clinical manifestations can be divided into infectious disease, hemolytic anemia and vaso-occlusive events. Pulmonary complications represent 20

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