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- W1976163220 abstract "Variability of mean arterial pressure (MAP) was examined in chronically instrumented, conscious, freely moving rats with pharmacologically altered efferent sympathetic influences on the cardiovascular system. MAP was recorded for 30 min beat-to-beat, using a computer under both control and experimental conditions: after administration of adrenoceptor antagonists (prazosin or phentolamine) or under P2X receptor inactivation produced either by desensitization with alpha, beta-methylene ATP or by PPADS blockade. Inhibition of adrenergic sympathetic effects on the cardiovascular system produced long-lasting and stable decrease in MAP. Prazosin did not modify MAP variability whereas phentolamine enhanced it. Under P2X receptor desensitization MAP decreased, the hypotensive effect being accompanied by a significant increase in MAP variability. A similar increase in MAP variability was observed after PPADS administration, while MAP level was not changed. Administration of PPADS in combination with phentolamine increased MAP variability more significantly than each of the drugs given separately. Changes in MAP variability under the various experimental conditions were not consistently correlated with changes in heart rate variability. We propose that ATP, being a mediator of sympathetic vasoconstriction, participates in baroreceptor-induced stabilization of MAP level." @default.
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- W1976163220 date "1998-05-01" @default.
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- W1976163220 title "The role of purinergic and adrenergic transmitters of the sympathetic system in the control of arterial blood pressure variability" @default.
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- W1976163220 doi "https://doi.org/10.1016/s0165-1838(98)00031-9" @default.
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