Orthostatic Tolerance
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Efeitos da suplementação de sal na profilaxia da síncope vasovagal : ensaio clínico randomizado
Introdução: Síncope e sintomas ortostáticos são comuns em pessoas saudáveis. A suplementação de sal é utilizada em pacientes com melhora na resposta pressora e aumento da tolerância ortostática. Nós testamos à hipótese de que uma suplementação de sal aumentaria a tolerância ortostática em voluntários saudáveis. Métodos e Resultados: Vint
Publicado em: 2009
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2. Salt supplement increases plasma volume and orthostatic tolerance in patients with unexplained syncope.
OBJECTIVE: To determine whether in patients presenting with posturally related syncope administration of salt increases plasma volume and improves orthostatic tolerance. Patients with poor tolerance of orthostatic stress tend to have lower than average plasma and blood volumes. DESIGN: A double blind placebo controlled study in 20 patients and an open study
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3. Deficient catecholamine release as the basis of orthostatic hypotension in pernicious anaemia.
A patient with peripheral neuropathy and orthostatic hypotension was found to have pernicious anaemia. Symptoms improved after vitamin B12 replacement therapy. Insulin tolerance testing showed that the patient lacked catecholamine, heart rate, and sweating responses to hypoglycaemia. This indicates that pernicious anaemia may cause orthostatic hypotension ow
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4. Effect of thermal stress on Frank–Starling relations in humans
The Frank–Starling ‘law of the heart’ is implicated in certain types of orthostatic intolerance in humans. Environmental conditions have the capacity to modulate orthostatic tolerance, where heat stress decreases and cooling increases orthostatic tolerance. The objective of this project was to test the hypothesis that heat stress augments and cooling a
Blackwell Science Inc.
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5. Dietary supplement with vitamin C prevents nitrate tolerance.
Enhanced formation of superoxide radicals has been proposed to play a major role in the development of nitrate tolerance in humans. We tested the effects of vitamin C (Vit-C) supplementation on glyceroltrinitrate (GTN)-induced hemodynamic effects during 3-d nonintermittent transdermal administration of GTN (0.4 mg/h) in nine healthy subjects. Tolerance devel
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6. Twenty four hour continuous non-invasive finger blood pressure monitoring: a novel approach to the evaluation of treatment in patients with autonomic failure.
Occasional sphygmomanometric readings are not an effective way of evaluating the effect of treatment in patients with hypoadrenergic orthostatic hypotension. A novel non-invasive portable device (Portapres) was used to monitor 24 hour continuous finger blood pressure before and during chronic volume expansion in a 66 year old woman with severe orthostatic hy
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7. Fludrocortisone in the treatment of hypotensive disorders in the elderly.
OBJECTIVE: To evaluate tolerance of fludrocortisone in older patients with hypotensive disorders. DESIGN: Prospective case series. SETTING: Syncope clinic. PATIENTS: 64 Consecutive patients over 65 years (mean age 80 years) with one or more hypotensive disorders (orthostatic hypotension, vasodepressor carotid sinus syncope, and/or vasodepressor neurocardioge
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8. Yohimbine in neurally mediated syncope. Pathophysiological implications.
In this study, we evaluated if increased sympathetic stimulation is an essential requirement for the development of neurally mediated syncope (NMS) by manipulating overall sympathetic outflow in subjects susceptible to tilt-induced syncope. Eight previously characterized patients with recurrent NMS (five females and three males; 34+/-2 yr) were recruited fro
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9. Menstrual cycle effects on sympathetic neural responses to upright tilt
Young women are more susceptible to orthostatic intolerance than men, though the sex-specific pathophysiology remains unknown. As blood pressure (BP) is regulated through the baroreflex mechanism, we tested the hypothesis that baroreflex control of muscle sympathetic nerve activity (MSNA) during orthostasis is impaired in women and can be affected by the men
Blackwell Science Inc.