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題 名 | 全身麻醉下定時插管之心率變異度時頻域分析=Time-Frequency Analysis of Heart Rate Variability during General Anesthesia at Different Time Induction |
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作 者 | 劉煌棋; 李繼源; 徐良育; | 書刊名 | 中華醫學工程學刊 |
卷 期 | 19:3 1999.09[民88.09] |
頁 次 | 頁193-202 |
分類號 | 416.52 |
關鍵詞 | 麻醉; 心電圖; 心率變異度; 時頻域分析法; 功率頻譜; Anesthesia; Electrocardiogram; Heart rate variability; Time frequency analysis; Power spectrum; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究嘗試利用時頻域分析法探討全身麻醉誘導過程中,心率變異特性之改變以 及其生理意義。並設計探討自麻醉誘導開始分為十分鐘、十五分鐘及二十分鐘時間排程插管 ,藉由不同誘導時間觀察心率變異的特性。 本研究共收集 28 位孩童資料, 將資料依實驗設計分別取出四個階段: 基準時段( baseline )、 氣管插管前時段( pre-intubation )、 氣管插管後時段( post-intubation )與麻醉藥維持時段( maintenance )。 接著經由統計分析之後,除了 證明誘導十分鐘、誘導十五分鐘與誘導二十分鐘之間的差異性外,並發現當低頻能量下降到 基準時段的 20%,高頻能量下降到基準時段的 40%,實施氣管插管已經不會引起明顯的頻譜 能量上升及散佈現象,由此可以證明自主神經在這些情況下對於劇烈的刺激已經不再有大幅 度反應。換句話說,這時候的麻醉深度已經足夠進行氣管插管以及施行手術。而低高頻功率 比方面,在氣管插管前期,低高頻功率之比值下降到基準點的 60%,證明麻醉藥 Halothane 對於低頻的抑制能力比高頻還要大,也就是說,低頻能量之變化幅度比高頻能量還要大,因 此,本研究建議使用低頻功率頻譜能量做為監測麻醉藥 Halothane 麻醉深度的指標。 |
英文摘要 | We have examined the spectral components of HRV during induction of anesthesia with inhalation of Halothane-nitro oxide and tracheal intubation of 28 children. The effect of 10, 15 and 20 minutes induction on the spectra power were examined at the following periods (1) baseline (2) pre-intubation (3) post-intubation and (4) maintenance phases. Marked reductions in the power of HRV spectra, at all frequencies, were found at pre-intubation, indicating the Halothane decreased total ANS activity. LF, HF and total powers increased after intubation. The LF/HF ratio decreased to about 60% of baseline in both pre-intubation and maintenance phase, indicating ANS stays at a dynamic balance situation after anesthesia. In addition, the Halothane depressed LF further than HR. For 20 minutes induction, the pre-intubation reduction and post-intubation increase in LF are significantly different then 10 and 15 minutes induction. Thus, it is concluded that when the LF power decreased to 20% of the baseline value may indicate adequacy amount of anesthesia for tracheal intubation and surgery. Despite the anesthesiologists' enthusiasm, there has been little success in arriving at an objective index for monitoring the procedure of anesthesia using physiologic signals. The results of this study indicate that the time-frequency analysis of HRV can be a useful tool for monitoring the depth of anesthesia and for accessing the ANS activity during anesthesia. |
本系統中英文摘要資訊取自各篇刊載內容。