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題 名 | Monochromatic Flash Electroretinogram under Hypoxic Condition=低氧條件下的單色光閃爍視網膜電圖 |
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作 者 | 林雲彬; 張寅; | 書刊名 | Journal of Medical and Biological Engineering |
卷 期 | 20:4 2000.12[民89.12] |
頁 次 | 頁239-243 |
分類號 | 416.7 |
關鍵詞 | 視網膜電圖; 低氧; ERG; Hypoxia; |
語 文 | 英文(English) |
中文摘要 | 外網膜在我們身體上具有非常高的新陳代謝活潑性,即使是些微的缺氧也會造成視網膜功能的異常。為了要更進一步的瞭解外網膜的電生理行為,我們對一些自願受測者在常態下與缺氧的狀態下作觀察。我們應用一種以單色光閃爍式,非侵入性的技術來得到受測者的視網膜電圖,以便瞭解在缺氧狀態下外網膜功能的變化。總共有六位年青,健康情形良好的成年人在常態(血氧飽和濃度SaO2等於99%)及缺氧狀態(血氧飽和濃度SaO2等於80%)下接受檢查。我們以氮氣與氧氣的混合氣體給予受測者呼吸,並調節氮氣與氧氣的比值以求逐漸達到受測者預定的缺氧狀態。記錄視網膜電圖的a、b、c波的振幅以及出現延滯時間。與常態下的視網膜電圖比較結果顯示,平均而言在缺氧狀態下的a波振幅減少了約100%而c波的延滯時間卻增加了約四倍。缺氧的狀態造成了視網膜電圖在a波的振幅及c波的出現延滯時間在統計上有顯著的差異性(各為p<0.05及p=0.009)。以上的結果指出缺氧會造成光感細胞對光線的靈敏度的降低以及視網膜上皮細胞反應的遲緩,但並不會改變神經傳導物質的釋放與接受的響應關係,此可以由b波的振幅與出現延滯時間並無造成統計上有意義的差異而得著證明。 |
英文摘要 | The outer retina has very high metabolic activity in our body, even a mild oxygen deficiency that could result in an abnormal retinal function. In order to have more understanding the electrophysiological behavior in outer retina, a particular hypoxic condition is applied to the volunteers to observe the difference while in normal and hypoxia. A noninvasive technique of monochromatic flash electroretinogram (ERG) is employed to probe the possible functional change in the hypoxic outer retinas. A total of six normal healthy young subjects were examined under normal (SaO2=99%) and hypoxic (SaO2=80%) conditions. The hypoxic condition is gradually reached by increasing the ratio of nitrogen gas to oxygen gas in the inhaled mixture gases to the subjects. The ERG is recorded and analyzed off line. The results show that the averaged a-wave amplitude is reduced about 50% and the implicit time of c-wave increases about 4 times under hypoxia while compares to normal condition. Both statistical test show significant differences are existence with p<0.05 and p=0.009 respectively. These results indicate that hypoxia reduces the sensitivity of photoreceptors to the light response as well as it slows down the reaction in the RPE cells. However, oxygen deficiency does not change the neural transmitter's release-receive response and this can be observed from statistical test in the b-wave amplitude and implicit time. |
本系統中英文摘要資訊取自各篇刊載內容。