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• W2049099710 abstract "1 Two sorts of effect of carbachol on local cerebral blood flow (caudate nucleus) have been studied: (a) a direct action on the arterial smooth muscle; (b) an interaction with the adrenergic (sympathetic) constrictor system which innervates the vascular system of this nucleus. 2 Continuous measurements of the following variables were performed in lightly anaesthetized rabbits: local blood flow (caudate nucleus), arterial blood pressure, PaO2, PaCO2. 3 After blockade of the nicotinic synapses in the superior cervical sympathetic ganglion by local hexamethonium injection, carbachol was infused into the common carotid artery, thus minimizing systemic effects of this drug. Infusions of 0.6, 1.3 and 2.5 micrograms kg-1 min-1 induced mean increases in caudate blood flow of about 8, 17 and 37% respectively, without notable modifications of other variables measured. 4 The dilator effect of 2.5 micrograms kg-1 min-1 carbachol was reduced to a mean of 12% after intravenous injection of 0.5 mg/kg atropine, and could be totally abolished by higher doses (1 to 1.5 mg/kg). 5 Administration of 2.5 micrograms kg-1 min-1 of carbachol diminished by more than 50% the reduction in caudate blood flow induced by postganglionic stimulation of the cervical sympathetic chain, but did not affect the reduction of flow obtained by intravenous infusion of noradrenaline (2.5 to 5.0 micrograms kg-1 min-1). This inhibition of the adrenergic (sympathetic) system by carbachol was not modified by high doses of atropine (1 mg/kg i.v.). 6 We conclude that: (a) the local cerebral blood flow of a deep structure can be significantly modified by activation of vascular muscarinic receptors; (b) activation of non-muscarinic prejunctional cholinoceptors can cause inhibition of the sympathetic fibres innervating the vascular bed of the same structure." @default.
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• W2049099710 date "1980-03-01" @default.
• W2049099710 modified "2023-09-26" @default.
• W2049099710 title "PARASYMPATHOMIMETIC INFLUENCE OF CARBACHOL ON LOCAL CEREBRAL BLOOD FLOW IN THE RABBIT BY A DIRECT VASODILATOR ACTION AND AN INHIBITION OF THE SYMPATHETIC-MEDIATED VASOCONSTRICTION" @default.
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• W2049099710 doi "https://doi.org/10.1111/j.1476-5381.1980.tb14558.x" @default.
• W2049099710 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2044198" @default.
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