Effects of nicardipine on the systemic and renal hemodynamics in acutely elevated blood pressure induced by vasoactive agents in conscious rabbits.
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概要
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The effects of the calcium antagonist, nicardipine, on blood pressure and renal hemodynamics were examined in rabbits with norepinephrine- and angiotensin II-induced elevation of blood pressure. With norepinephrine-infusion, the mean arterial pressure increased from 84±4 to 118±4mmHg accompanied by decreases in heart rate (10%) and renal blood flow (45%). In contrast to the changes in renal blood flow with norepinephrine-infusion, renal blood flow following angiotensin II-induced elevation of blood pressure was decreased by more than 60% at the same degree of elevation of mean arterial pressure. Both intravenous and intrarenal administration of nicardipine (1μg/kg) reduced the mean arterial pressure and restored the decreased heart rate and renal blood flow in both norepinephrine- and angiotensin II-infused animals. Intrarenal injection of nicardipine decreased the elevated mean arterial pressure of angiotensin II-induced hypertension more than did intravenous injection (16±2 vs. 11±3mmHg, p<0.05). Renal nerve denervation did not lead to any significant effects on the mean arterial pressure, heart rate and renal blood flow following intravenous or intrarenal injection of nicardipine in norepinephrine-infused animals. On the other hand, in angiotensin II-induced elevation of blood pressure, the potentiated hypotensive effect of intrarenal injection of nicardipine was lost in renally denervated animals.In conclusion, the calcium antagonist, nicardipine, was shown to reduce the acutely elevated blood pressure caused by norepinephrine or angiotensin II. In angiotensin II-induced elevation of blood pressure, the renal vasculature may play a more important role in both pressor and depressor aspects in the regulation of blood pressure as compared to its role in norepinephrine-induced hypertension.
- International Heart Journal刊行会の論文
著者
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Saruta Takao
Department Of Clinical Pharmacology Jichi Medical School
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Suzuki Hiromichi
Department Of Applied Physics Faculty Of Science Fukuoka University
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Kumagai Hiroo
Department Of Applied Physics The University Of Tokyo:(present Address) Department Of Physics Chiba
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Matsukawa Shigeaki
Department Of Internal Medicine School Of Medicine Keio University
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Kumagai Hiroo
Department of Internal Medicine, Keio University School of Medicine
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SUZUKI Hiromichi
Department of Internal Medicine, keio University School of Medicine
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MATSUKAWA Shigeaki
Department of Internal Medicine, Keio University School of Medicine
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ITAYA Yoshiaki
Department of Internal Medicine, Keio University School of Medicine
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