Venous Occlusion Plethysmography
Mostrando 13-24 de 30 artigos, teses e dissertações.
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13. The effect of passive tilting on microvascular parameters in the human calf: a strain gauge plethysmography study.
1. Cumulative small steps in venous congestion pressure were used to study the effect of passive tilt on vascular parameters in dependent tissues. Using this protocol we have non-invasively assessed venous pressure (Pv,est), isovolumetric cuff pressure (Pv,i), which is the congestion cuff pressure (Pcuff) that has to be exceeded to induce fluid filtration. W
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14. Blood hyperviscosity with reduced skin blood flow in scleroderma
The vascular complications of scleroderma have previously been attributed to the progressive obliteration of small vessels. Our study was carried out to determine whether abnormalities of blood viscosity occur in this disease, thereby contributing to the ischaemic process. Blood viscosity was measured in 20 patients using a rotational viscometer. At a high r
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15. A reassessment of mercury in silastic strain gauge plethysmography for microvascular permeability assessment in man.
1. We have used non-invasive mercury in a silastic strain gauge system to assess the effect of pressure step size, on the time course of the rapid volume response (RVR) to occlusion pressure. We also obtained values for hydraulic conductance (Kf), isovolumetric venous pressure (Pvi) and venous pressure (Pv) in thirty-five studies on the legs of twenty-three
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16. Tetrahydrobiopterin restores endothelial function in hypercholesterolemia.
In hypercholesterolemia, impaired nitric oxide activity has been associated with increased nitric oxide degradation by oxygen radicals. Deficiency of tetrahydrobiopterin, an essential cofactor of nitric oxide synthase, causes both impaired nitric oxide activity and increased oxygen radical formation. In this study we tested whether tetrahydrobiopterin defici
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17. Separation of Forearm Hemodynamics Into Skin and Muscle Components by Means of I-Epinephrine Iontophoresis
By a combination of iontophoresis of I-epinephrine into the skin of one arm and simultaneous venous occlusion plethysmography in both treated (muscle only) and untreated forearms (muscle plus skin), we examined in 16 normal volunteers forearm blood flow, capillary filtration coefficient and venous capacity at cuff pressure of 40 mm of mercury (VC40) at rest,
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18. Effects of macro- and microcirculatory functions on ceftriaxone concentrations in tissues of patients with stage IV peripheral arterial occlusive disease.
The objective of the study was to determine the ceftriaxone levels achievable within lesions (toe or forefoot area) in patients with septic gangrene and to investigate the relationship between macro- and microcirculatory parameters and antibiotic concentration. Fifteen patients with severe chronic peripheral occlusive disease received an intravenous injectio
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19. Inhibition and stimulation of nitric oxide synthesis in the human forearm arterial bed of patients with insulin-dependent diabetes.
Patients with insulin-dependent diabetes mellitus have an increased mortality and morbidity due to vascular complications. Nitric oxide from the vascular endothelium contributes to the control of normal vascular tone, and endothelial dysfunction has been implicated in the pathogenesis of diabetic vascular disease. In this study we have examined basal and sti
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20. Impaired vasodilation of forearm resistance vessels in hypercholesterolemic humans.
The effect of hypercholesterolemia on vascular function was studied in humans. To eliminate the potential confounding effects of atherosclerosis, vascular reactivity was measured in the forearm resistance vessels of 11 normal subjects (serum LDL cholesterol = 111 +/- 7 mg/dl) and 13 patients with hypercholesterolemia (serum LDL cholesterol = 211 +/- 19 mg/dl
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21. Acute effects of vibration on peripheral blood flow in healthy subjects.
OBJECTIVES: The main objective was to study the acute vascular effects in the hands of normal healthy subjects of a complex vibration spectrum similar to that generated by many industrial hand held tools. The effects of repeated bouts of vibrations and alterations in the intensity of vibration were also studied. METHODS: Blood flow was measured by venous occ
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22. Cardiovascular effects of dobutamine stress testing in women with suspected coronary artery disease.
OBJECTIVE: To investigate the central and peripheral haemodynamic response to dobutamine stress testing in women with suspected ischaemic heart disease and to seek an explanation for the hypotension phenomenon. DESIGN: 18 women aged 54-73 years were investigated with Doppler echocardiography and venous occlusion plethysmography during intravenous infusion of
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23. Vitamin C improves endothelium-dependent vasodilation in patients with non-insulin-dependent diabetes mellitus.
Endothelium-dependent vasodilation is impaired in humans with diabetes mellitus. Inactivation of endothelium-derived nitric oxide by oxygen-derived free radicals contributes to abnormal vascular reactivity in experimental models of diabetes. To determine whether this observation is relevant to humans, we tested the hypothesis that the antioxidant, vitamin C,
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24. Evidence for nitric oxide-mediated sympathetic forearm vasodiolatation in humans.
1. Our aim was to determine if sympathetic vasodilatation occurs in the human forearm, and if the vasodilating substance nitric oxide contributes to this dilatation. We also sought to determine if the nitric oxide might be released as a result of cholinergic stimulation of the vascular endothelium. 2. Blood flow was measured in the resting non-dominant forea