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- W2065384718 abstract "Studies from this laboratory have shown that the first filial offspring of female spontaneouslyhypertensive rats and male Wistar-Kyoto (WKY) normotensive rats develop stress-induced hypertension. The present study sought to examine the effects of intracerebroventricular administration of clonidine (8 μg) on cardiovascular and sympathoadrenal responses to aversive classical conditioning in these borderline hypertensive rats (BHR) and in normotensive WKY control rats. Clonidine caused significant reductions in resting arterial pressure, vascular resistance, heart rate and concentrations of epinephrine (E) in plasma for both hypertensive and normotensive rats. Central administration of normal saline to control rats of each strain did not alter basal cardiovascular or sympathoadrenal function. The presentation of a conditioned stimulus (CS) elicited a significant increase in arterial pressure and total peripheral resistance in hypertensive rats treated with saline and clonidine and in normotensive rats treated with saline. In contrast, normotensive rats treated with clonidine showed no increases in arterial pressure or vascular resistance following the onset of the conditioned stimulus. The aversive conditioning session instigated significant increases in the concentrations of norepinephrine (NE) and E in plasma in saline-treated rats. Hypertensive and normotensive rats treated with clonidine-showed a blunted increase in plasma concentrations of NE and E during this period; however, concentrations of E in hypertensive rats increased significantly from the baseline period after injection. These data suggest that an abnormality in central alpha2-adrenoceptor-mediated inhibition of sympathoadrenal discharge and sympathetic vasomotor tone may predispose the hypertensive rat to develop stress-induced hypertension." @default.
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- W2065384718 date "1986-09-01" @default.
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- W2065384718 title "The effects of intracerebroventricular injection of clonidine on conditioned pressor and adrenergic responses in rats" @default.
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- W2065384718 doi "https://doi.org/10.1016/0028-3908(86)90189-9" @default.
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