Effects of antihypertensive agents on baroreceptor function in early hypertensive rats.

Effects of antihypertensive agents on baroreceptor function in early hypertensive rats.
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抗高血压药物对早期高血压大鼠压力感受器功能的影响。

DOI:
10.1161/01.hyp.24.6.808
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发表时间:
1994
期刊:
影响因子:
8.3
通讯作者:
T. Saruta
T. Saruta
中科院分区:
医学1区
文献类型:
--
作者:
M. Ichikawa;Hiromichi Suzuki;K. Kumagai;M. Ryuzaki;H. Kumagai;M. Jimbo;M. Nishizawa;T. Saruta

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为了研究目前使用的四种药物(三氯噻嗪、阿替洛尔、尼卡地平和依那普利)的降压治疗对高血压早期动脉压力感受器功能的影响,我们给8 - 10周龄的自发性高血压大鼠和Wistar-Kyoto大鼠施用了这些药物,并检查了主动脉神经活动功能。在未经治疗的自发性高血压大鼠中,动脉压和主动脉神经活动之间的关系向右移动,即向更高的压力水平移动(阈值压力,90 +/- 3与76 +/- 1 mm Hg,P < .05),通过Logistic函数分析得到的最大增益被降低(1.55 +/- 0.08%对2.18 +/- 0.13%最大值/mm Hg,P <0.01)。在自发性高血压大鼠中,四种药物中的每一种均使动脉压降低(-20 +/- 1 mm Hg,P < .01),使动脉压-主动脉神经活动关系发生类似程度的显著变化(阈值压力,77 +/- 1 mm Hg,P < .05)。此外,四种药物治疗同样增加了自发性高血压大鼠的最大增益(2.13 +/- 0.09%最大/mm Hg,P <0.05)。抗高血压药物既不影响血压,也不影响主动脉神经活动的Wistar-Kyoto大鼠。这些结果表明,抗高血压治疗与四类药物同样提高动脉压力感受器功能,通过降低血压,但不是通过特定的降压机制在高血压的早期阶段。
To investigate the effects of antihypertensive treatment with four currently used agents (trichlormethiazide, atenolol, nicardipine, and enalapril) on the arterial baroreceptor function at the early phase of hypertension, we administered the agents to spontaneously hypertensive rats and Wistar-Kyoto rats from 8 to 10 weeks of age and examined the aortic nerve activity function. In untreated spontaneously hypertensive rats, the relation between the arterial pressure and aortic nerve activity was shifted to the right, that is, to a higher pressure level (threshold pressure, 90 +/- 3 versus 76 +/- 1 mm Hg, P < .05), and the maximum gain which was obtained by logistic function analysis was depressed (1.55 +/- 0.08% versus 2.18 +/- 0.13% maximum/mm Hg, P < .01) as compared with untreated Wistar-Kyoto rats. An equivalent decrease in arterial pressure with each of the four agents (-20 +/- 1 mm Hg, P < .01) produced a leftward shift of the arterial pressure-aortic nerve activity relation to a similar extent (threshold pressure, 77 +/- 1 mm Hg, P < .05) in spontaneously hypertensive rats. In addition, treatment with the four agents equally augmented the maximum gain in spontaneously hypertensive rats (2.13 +/- 0.09% maximum/mm Hg, P < .05). The antihypertensive agents affected neither the blood pressure nor the aortic nerve activity in Wistar-Kyoto rats. These findings suggest that antihypertensive treatment with the four classes of agents equally enhances the arterial baroreceptor function through blood pressure reduction but not through specific depressor mechanisms at the early stage of hypertension.
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