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題 名 | Cardiac Parasympathetic Output of Nucleus Ambiguus is not Altered in Spontaneously Hypertensive Rats=先天性高血壓大鼠延腦疑核區控制心跳的迷走機制正常 |
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作 者 | 邱瑞珍; 陳瑞芬; 嚴震東; | 書刊名 | Acta Zoologica Taiwanica |
卷 期 | 11:2 民89.07 |
頁 次 | 頁111-125 |
分類號 | 383.9 |
關鍵詞 | 心跳; 血壓; 高血壓; 延腦腹外側區後段; 肤胺酸; Caudal ventrolateral medulla; Heart rate; Blood pressure; Hypertension; Glutamate; SHR; SHRSP; |
語 文 | 英文(English) |
中文摘要 | 本研究探討先天性高血壓大鼠(SHR)及中風型先天性高血壓鼠(SHRSP),延腦後段腹側區控制心臟功能的副交感性神經細胞的分佈與反應能力是否與其正常血壓的控制組WKY及Wistar 有所不同。大婛以氯醛醣及尿酯作腹麻醉。以微注射方式用L-肤胺酸(Glu,10mM, 11nl)興奮延腦疑核附近的區域來探測附心跳點的分布與最強能力。我們發現高血壓大鼠疑核附心跳區域的位置,大小及心跳作用能力均與正常血壓控制組沒有顯著的差異。同時控測延腦腹外側後段的降血壓反應,則發現高血壓大鼠降血壓能力大於正常血壓控制組大鼠,顯示交感神經控制區有明顯差異。同時考量此二結果可以解釋為何高血壓鼠在感壓反射測器減弱的狀況下有交感神經竑應能力增加,心跳反應減弱的區別改變。 |
英文摘要 | The distribution and reactivity of cardiac parasympathetic neurons in the ventral medulla of hypertensive rats (spontaneously hypertensive rats [SHR] and stroke-prone spontaneously hypertensive rats [SHRSP]) were compared with age matched normotensive rate (Wistar and Wistar-Kyoto [WKY]). Rats were anesthetized with α-chloralose and urethane. L-glutamate (Glu, 10 mM. 11 nl) was microinjected into the medulla to map the distribution of the cradioinhibitory neurons in and around the nucleus ambiguous (NA). The distribution pattern of the bradycradiac sites was similar in the four strains of rats. Differences in the maximal bradycardiac responses were not statistically significant either. In comparison, hypertensive rats had significantly larger depressor responses to Glu microinjected into the caudal ventrolateral medulla. Taken together, the results suggest that the ventral medulla of hypertensive rats has enhanced sympathetic reactivity, whereas the parasympathetic caradioinhibitory mechanisms of the NA of hypertensive rats are not significantly altered. Therefore, the diminished cardovagal response in the baroreflex of hypertensive rats may be due to an alteration on the input side. |
本系統中英文摘要資訊取自各篇刊載內容。