Breathing Cardiovascular Control
Mostrando 13-19 de 19 artigos, teses e dissertações.
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13. Analysis of the cardiovascular changes induced in the rat by graded levels of systemic hypoxia.
1. In rats anaesthetized with Saffan, we have further analysed the respiratory, cardiac and regional vascular responses induced by 3 min periods of graded hypoxia (breathing 15, 12, 8 or 6% O2 in N2). 2. Frequently, hypoxia evoked an episode, lasting 1-1.5 min, of tachycardia, renal and mesenteric vasoconstriction and skeletal muscle vasodilatation. The tach
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14. Nitric oxide and exercise in the horse.
1. The effects of exercise on the production rate of nitric oxide (NO) in exhaled air (VNO) and the effects of inhaled NO (80 p.p.m.) on cardiovascular and respiratory parameters were investigated in five Throughbred horses. 2. The concentration of NO ([NO]) in exhaled air collected from within the nasal opening was lower when collected at a high flow rate o
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15. Effects of a patent foramen ovale on arterial saturation during exercise and on cardiovascular responses to deep breathing, Valsalva manoeuvre, and passive tilt: relation to history of decompression illness in divers.
OBJECTIVE--To determine whether the presence of a patent foramen ovale could result in significant arterial desaturation and affect the responses of heart rate and blood pressure to physiological manoeuvres and to determine whether responses differed between those with and those without prior clinical events associated with a patent foramen ovale. DESIGN--Bl
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16. Effect of positive and negative step changes in intrathoracic pressure on left ventricular function in conscious man.
1. Breathing affects left ventricular stroke volume (LVSV) in normal subjects. The observed relationship may result from interaction between the effects of changing lung volume and intrathoracic pressure (IP). 2. To investigate the effect of IP on LVSV with minimal changes in lung volume, beat-by-beat LVSV (pulsed Doppler ultrasound) and systemic blood press
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17. Afferent and efferent components of the cardiovascular reflex responses to acute hypoxia in term fetal sheep.
1. We studied the effects of acute isocapnic hypoxia on arterial and central venous pressures, carotid and femoral blood flows and heart rate in intact and carotid denervated fetal sheep between 118 and 125 days gestation, after pre-treatment with either saline, atropine or phentolamine. Electrocortical activity (ECoG) and the incidence of fetal breathing mo
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18. Respiratory sensations, cardiovascular control, kinaesthesia and transcranial stimulation during paralysis in humans.
1. To determine whether discomfort associated with breathing (dyspnoea) is related to the chemical drive to breath, three subjects were totally paralysed while fully conscious. Subjective responses to a rising CO2 stimulus were obtained during rebreathing, rebreathing with CO2 added, and breath holding. Dyspnoea was measured with a 10-point Borg scale. 2. Fo
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19. Effects of distension of the urinary bladder on the cardiovascular reflexes from the carotid baroreceptors in the dog.
1. The hindlimb vasoconstrictor effects of distension of the urinary bladder were studied at different levels of input from the carotid sinus baroreceptors in the dog anaesthetized with a mixture of chloralose and urethane. 2. The vascularly isolated hindlimb was perfused at constant blood flow through its femoral artery, so that a change in pressure gradien