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• W2050872369 abstract "We have examined the effects of experimental subarachnoid hemorrhage (SAH), induced by delivering autologous blood into the subarachnoid space, on the adrenergic mechanisms of the goat cerebrovascular bed. To achieve this, the response to noradrenaline was recorded both in vivo, by measuring cerebral blood flow in unanesthetized animals, and in vitro, by recording isometric tension in isolated cerebral arteries. In addition, we checked the function of adrenergic innervation by measuring the tritium efflux evoked by electrical stimulation in cerebral arteries preloaded with [3H]-noradrenaline, and we examined this innervation by using both fluorescent and electron transmission microscopy. All studies were performed before and 3, 7, and 14 days after SAH. Injections of noradrenaline (0.1-10 micrograms) directly into the cerebro-arterial supply produced reductions in cerebral blood flow, with no concomitant changes in mean arterial blood pressure and heart rate, which were significantly enhanced (P < 0.01) 3 and 7 days after SAH and returned to control values 14 days after hemorrhage induction. In isolated cerebral arteries, noradrenaline (10(-8)-10(-4) mol/L) produced concentration-dependent contractions, which were also significantly enhanced (P < 0.05) 3 and 7 days after SAH and returned to control values in cerebral arteries obtained 14 days after SAH. On the other hand, increases in the release of tritium induced by electrical stimulation in cerebral arteries preloaded with [3H]-noradrenaline were significantly lower (P < 0.01) after SAH. Moreover, microscopical studies showed a reduction in catecholamine fluorescence and signs of sympathetic degeneration in some perivascular axons after SAH.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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• W2050872369 date "1994-06-01" @default.
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• W2050872369 title "Changes in the Adrenergic Mechanisms of Cerebral Arteries after Subarachnoid Hemorrhage in Goats" @default.
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• W2050872369 doi "https://doi.org/10.1227/00006123-199406000-00011" @default.
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