Lack of an effect of age on the response to clonidine.

Lack of an effect of age on the response to clonidine.
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年龄对可乐定的反应缺乏影响。

DOI:
10.1038/clpt.1990.9
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发表时间:
1990
影响因子:
6.7
通讯作者:
Nies,AS
Nies,AS
中科院分区:
医学2区
文献类型:
--
作者:
Klein,CE;Gerber,JG;Nies,AS

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老年人血浆去甲肾上腺素浓度和出现率增高。解释这一观察结果的一个假设是,老年人脑干中调节外周交感神经张力的α2-肾上腺素受体的反应减弱。为了评估年龄对α2-肾上腺素受体功能的影响,我们研究了12名健康老年受试者和12名健康年轻志愿者,并比较了口服可乐定剂量增加后血浆去甲肾上腺素和血压的降低。我们发现,对于相同的血浆可乐定浓度,两组的血压和血浆去甲肾上腺素浓度下降相等。这些数据表明,健康老年人群中血浆去甲肾上腺素增加和血压升高似乎不是继发于中枢神经系统中α2-肾上腺素能对激动剂的反应降低。临床药理学和治疗学(1990)47,61 -67; doi:10.1038/clpt.1990.9
The plasma concentration and appearance rate of norepinephrine are increased in the elderly. A hypothesis to explain this observation is that the elderly have a diminished response of the α2‐adrenoreceptor in the brainstem that modulates peripheral sympathetic tone. To evaluate the effect of age on α2‐adrenoreceptor function, we studied 12 healthy elderly subjects and 12 healthy young volunteers and compared the decrease in plasma norepinephrine and blood pressure in response to increasing doses of orally administered clonidine. We found that, for the same plasma clonidine concentration, the blood pressure and plasma norepinephrine concentration fell equivalently in both groups. These data imply that the increased plasma norepinephrine and the elevated blood pressure in the healthy elderly population do not appear to be secondary to a decrease in α2‐adrenergic response to an agonist in the central nervous system.Clinical Pharmacology and Therapeutics(1990)47,61–67; doi:10.1038/clpt.1990.9
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