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題 名 | 上呼吸道氣流與二氧化碳濃度增加對膈神經活動的影響 |
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作 者 | 黃基礎; 鄭劍庭; 廖娟妙; | 書刊名 | 師大生物學報 |
卷 期 | 23 1988.10[民77.10] |
頁 次 | 頁189-202 |
分類號 | 361.12 |
關鍵詞 | 二氧化碳; 上呼吸道; 氣流; 膈神經; 濃度; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究的主要目的是探討膈神經在不同二氧化碳濃度下對上呼吸道氣流變化的反應。採用麻醉猫,切斷迷走神經,麻痺並以人工呼吸器維持其生命,製作一個獨立上呼吸道。猫呼氣末氣體濃度維持在高氧而二氧化碳正常。三種不同吸氣氣流是每公斤體重每分鐘1、2及3公升。氣流為2和3 l/min/kg時,膈神經活動無論是CO2正常或中度增加皆受氣流抑制,但CO2增加為FETCO2= 0.09時, 21/min/kg的氣流就不再抑制膈神經放電。在CO2正常時,氣流抑制的劑量反應曲線迴歸直線為91.7-6.5X1,當CO2增加到FETCO2 = 0.09時,反應曲線向上移動,其迴歸直線為97.1-5.9X1。這些結果暗示上呼吸道傳來的刺激與化學感受器所測得之化學變化可能在中樞發生相互作用,然後影響膈神經的活動。 |
英文摘要 | The purpose of the present report was to evaluate phrenic response to airflow changes in the upper airway (UAW) at different levels of end- tidal concentration of carbon dioxide ( FETCO2 ). An isoiated UAW was produced in pen tobarbital - anesthetized , vagotomized , paralyzed and ventilated cats. Phrenic activities were monitored at normocapnia and hypercapnia in hyperoxia. Three levels of inspiratory airflow were used; 1 ,2 and 3 l/min/kg. Significant decreases in phrenic activity with airflow of 2 and 3 l/min/kg passing through the UAW were observed at normocapnia and mild hypercapnia. At high level of carbon dioxide (FETCO2 = 0.09 ) ,decrease of phrenic burst in response to airflow of 21/min/kg became undetectable. Intercept and slop of the dose –response curve of phrenic discharges with airflow at FET CO2 of 0.04 was 91.7 and -6. 5 respectively, and became 97.1 ruld- 5.9 at 0.09. Thus, the dose - response curve of phrenic activities with different airflow rate passing through the UAW was shifted to the right or upward as end - tidal concentration of CO2 was increased. These results indicate that an interaction between signals from the UAW and the chemoreceptor may occur in the central nervous sys tern. |
本系統中英文摘要資訊取自各篇刊載內容。