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- W2078366885 abstract "Abstract The beneficial effects of the calcium-entry blocking agent, nimodipine, on the cerebral circulation have been extensively studied but less is known about its peripheral vascular effects. In the present study, the effects of nimodipine on vasoconstrictor responses were investigated in the hindquarters vascular bed of the cat under constant-flow conditions. Nimodipine decreased hindquarters vascular resistance and inhibited vasoconstrictor responses to BAY K8644 (methyl-1,4-dihydro-2,6-dimethyl-3-nitro-4-(2-trifluoromethyl-phenyl)-pyridine-phenyl)-pyridine-5-carboxylate) and noradrenaline, to the α1-adrenoceptor agonists phenylephrine and methoxamine, and the α2-adrenoceptor agonists BHT 933 (2-amino-6-ethyl-4,5,7,8-tetrahydro-6H-oxazolo[5,4-d]azepine dihydrochloride) and UK 14304 (5-bromo-6-(2-imidazoline-2-yl-amino)quinoxaline). In addition to inhibiting α-adreno-ceptor-mediated responses, nimodipine decreased responses to the vasoactive peptides angiotensin II and endothelin-1. Both the vasodilatory actions and inhibitory effects of nimodipine on vasoconstrictor responses were dose-dependent when the calcium antagonist was infused at rates of 0.1 and 1 μg min−1. The results of the present study suggest that vasoconstrictor responses to α-adrenoceptor agonists and to the vasoactive peptides are dependent, in part, on an extracellular source of calcium. It is concluded that nimodipine and related dihydropyridine calcium-entry blocking agents may be effective in the treatment of peripheral vascular disorders in which adrenergic tone is increased or plasma levels of angiotensin II or endothelin-1 are elevated." @default.
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- W2078366885 date "1998-06-01" @default.
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- W2078366885 title "Influence of Nimodipine on Vasoconstrictor Responses Hindquarters Vascular Bed of the Cat" @default.
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- W2078366885 doi "https://doi.org/10.1111/j.2042-7158.1998.tb06904.x" @default.
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