Effects of antihypertensive agents on arterial baroreceptor reflexes in conscious rats.

Effects of antihypertensive agents on arterial baroreceptor reflexes in conscious rats.
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抗高血压药物对清醒大鼠动脉压力感受器反射的影响。

DOI:
10.1161/01.hyp.20.5.701
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发表时间:
1992
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:
K. Kumagai;H. Suzuki;M. Ryuzaki;H. Kumagai;M. Ichikawa;M. Jimbo;Y. Matsumura;T. Saruta

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在45只清醒自发性高血压大鼠和37只年龄匹配的Wistar-京都大鼠上,观察了目前常用的四种降压药物(三氯美嗪、阿替洛尔、尼卡地平和依那普利)对动脉压力感受器反射控制肾交感神经活动和心率的影响。从8周龄开始服用降压药2周,以治疗和预防高血压的发展。每种抗高血压药物都将血压降低到相似的水平(-13+/-3 mm Hg,p<0.05)。在清醒状态下记录血压、心率和肾交感神经活动,同时记录注射苯肾上腺素和硝酸甘油的情况。压力感受器反射的增益由Logistic函数曲线的最大斜率确定。未经治疗的自发性高血压大鼠对肾交感神经活动和心率的反射控制敏感性降低(分别为对照组的-1.78+/-0.07%和-2.16+/-0.05次/分/毫米汞),而未经治疗的Wistar-京都大鼠(分别为对照组的-3.62+/-0.18%和-3.46+/-0.11次/分钟/毫米汞,p<0.05)。
The effects of antihypertensive treatment with four currently used agents (trichlormethiazide, atenolol, nicardipine, and enalapril) on the arterial baroreceptor reflex control of renal sympathetic nerve activity and heart rate were investigated in 45 conscious spontaneously hypertensive rats and 37 age-matched Wistar-Kyoto rats. Antihypertensive agents were administered for 2 weeks beginning at 8 weeks of age to treat and prevent the development of hypertension. Blood pressure was reduced to a similar level (-13 +/- 3 mm Hg, p < 0.05) by each antihypertensive agent. Blood pressure, heart rate, and renal sympathetic nerve activity were recorded in the conscious state during phenylephrine and nitroglycerin ramp infusion. The gain in the baroreceptor reflex was determined from the maximum slope of logistic function curves. Untreated spontaneously hypertensive rats exhibited decreased sensitivity of reflex control of renal sympathetic nerve activity and heart rate (-1.78 +/- 0.07% of control/mm Hg and -2.16 +/- 0.05 beats per minute/mm Hg, respectively) compared with untreated Wistar-Kyoto rats (-3.62 +/- 0.18% of control/mm Hg, p < 0.01, and -3.46 +/- 0.11 beats per minute/mm Hg, p < 0.05, respectively).(ABSTRACT TRUNCATED AT 250 WORDS)
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发表时间: 1989-08-01
影响因子: 20.1
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DOI: --
发表时间: 1985
期刊: Hypertension (Dallas, Tex. : 1979)
影响因子: --
作者:
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