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http://dx.doi.org/10.6109/jkiice.2010.14.9.2099

Estimation of the effect on the autonomic nervous system using the return-map  

Jo, Heung-Kuk (동서대학교 정보네트워크공학)
Ye, Soo-Young (동서대학교 메카트로닉스공학과)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.14, no.9, 2010 , pp. 2099-2104 More about this Journal
Abstract
In this paper, HRV signal which was appeared RR intervals from ECG was analyzed using return-map during anesthesia. We intended to estimate the depth of anesthesia observing the change of autonomic nervous activity(ANS) because HRV showed change of cardio-vascular system of the body according to state of ANS. Return-map analysis is to reconstruct time series of HRV to phase space after calculating delay time and embedded time. After approximating the signal distribution which was reconstructed in phase space in elliptic, we calculated the lengths of major and minor axises of the elliptic and the values was used to estimate the depth of anesthesia. Stages of the anesthesia were 7 levels to evaluate the depth of anesthesia. At induction stage of strong external stimulation, the length of major and minor axis were statistically high and at the operation stage of non-external stimulation, the values were statistically low. Conclusively, the stages of anesthesia were discriminated by HRV signal mapped in the phase space during operation.
Keywords
return-map; autonomic nervous system; anesthesia; ECG;
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