Power analysis of gamma frequencies (30-47Hz), adjusting for muscle activity (80-97Hz), in anesthesia

A comparison between young adults, middle-aged and the elderly

Stacey Pritchett, Eugene Zilberg, Ming Xu, David Burton, Ian Brown, Paul Myles

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

This study looks at the role of EEG gamma activity, and the influence of facial EMG (80-97 Hz), in predicting consciousness during anesthesia. It also studies the association between the conventional depth of anesthesia index, BIS (Aspect Medical Systems), and EEG gamma and EMG activity. Data has been collected from 21 adult patients and grouped into young adults (18-39 yrs, n=3), middle-aged (40-64 yrs, n=10) and the elderly (65 + yrs, n=8). The power of the EEG gamma activity was recorded from Fpz-Mastoid and the power of the EMG was recorded from Fpz - Mastoid and Masseter - Mastoid. It has been found that when considered alone, EEG gamma power is associated with both BIS index and consciousness versus unconsciousness, showing a decrease in power as consciousness is lost. When the effect of EEG gamma power is adjusted for EMG, it is found that generally these associations can be explained by the EMG power alone. There are two exceptions to this. In the young adults group there is a stronger association between BIS index and EEG gamma than there is between BIS index and EMG. In the elderly group, the state of consciousness is equally associated with EEG gamma and EMG recorded from the Masseter, but not with the EMG recorded from Fpz.

Original languageEnglish
Title of host publicationProceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08
Pages825-830
Number of pages6
Publication statusPublished - 2008
EventInternational Conference of the IEEE Engineering in Medicine and Biology Society 2008 - Vancouver Convention and Exhibition Centre, Vancouver, Canada
Duration: 20 Aug 200825 Aug 2008
Conference number: 30

Conference

ConferenceInternational Conference of the IEEE Engineering in Medicine and Biology Society 2008
Abbreviated titleEMBC 2008
CountryCanada
CityVancouver
Period20/08/0825/08/08

Cite this

Pritchett, S., Zilberg, E., Xu, M., Burton, D., Brown, I., & Myles, P. (2008). Power analysis of gamma frequencies (30-47Hz), adjusting for muscle activity (80-97Hz), in anesthesia: A comparison between young adults, middle-aged and the elderly. In Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08 (pp. 825-830). [4649281]
Pritchett, Stacey ; Zilberg, Eugene ; Xu, Ming ; Burton, David ; Brown, Ian ; Myles, Paul. / Power analysis of gamma frequencies (30-47Hz), adjusting for muscle activity (80-97Hz), in anesthesia : A comparison between young adults, middle-aged and the elderly. Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08. 2008. pp. 825-830
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abstract = "This study looks at the role of EEG gamma activity, and the influence of facial EMG (80-97 Hz), in predicting consciousness during anesthesia. It also studies the association between the conventional depth of anesthesia index, BIS (Aspect Medical Systems), and EEG gamma and EMG activity. Data has been collected from 21 adult patients and grouped into young adults (18-39 yrs, n=3), middle-aged (40-64 yrs, n=10) and the elderly (65 + yrs, n=8). The power of the EEG gamma activity was recorded from Fpz-Mastoid and the power of the EMG was recorded from Fpz - Mastoid and Masseter - Mastoid. It has been found that when considered alone, EEG gamma power is associated with both BIS index and consciousness versus unconsciousness, showing a decrease in power as consciousness is lost. When the effect of EEG gamma power is adjusted for EMG, it is found that generally these associations can be explained by the EMG power alone. There are two exceptions to this. In the young adults group there is a stronger association between BIS index and EEG gamma than there is between BIS index and EMG. In the elderly group, the state of consciousness is equally associated with EEG gamma and EMG recorded from the Masseter, but not with the EMG recorded from Fpz.",
author = "Stacey Pritchett and Eugene Zilberg and Ming Xu and David Burton and Ian Brown and Paul Myles",
year = "2008",
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Pritchett, S, Zilberg, E, Xu, M, Burton, D, Brown, I & Myles, P 2008, Power analysis of gamma frequencies (30-47Hz), adjusting for muscle activity (80-97Hz), in anesthesia: A comparison between young adults, middle-aged and the elderly. in Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08., 4649281, pp. 825-830, International Conference of the IEEE Engineering in Medicine and Biology Society 2008, Vancouver, Canada, 20/08/08.

Power analysis of gamma frequencies (30-47Hz), adjusting for muscle activity (80-97Hz), in anesthesia : A comparison between young adults, middle-aged and the elderly. / Pritchett, Stacey; Zilberg, Eugene; Xu, Ming; Burton, David; Brown, Ian; Myles, Paul.

Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08. 2008. p. 825-830 4649281.

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

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AB - This study looks at the role of EEG gamma activity, and the influence of facial EMG (80-97 Hz), in predicting consciousness during anesthesia. It also studies the association between the conventional depth of anesthesia index, BIS (Aspect Medical Systems), and EEG gamma and EMG activity. Data has been collected from 21 adult patients and grouped into young adults (18-39 yrs, n=3), middle-aged (40-64 yrs, n=10) and the elderly (65 + yrs, n=8). The power of the EEG gamma activity was recorded from Fpz-Mastoid and the power of the EMG was recorded from Fpz - Mastoid and Masseter - Mastoid. It has been found that when considered alone, EEG gamma power is associated with both BIS index and consciousness versus unconsciousness, showing a decrease in power as consciousness is lost. When the effect of EEG gamma power is adjusted for EMG, it is found that generally these associations can be explained by the EMG power alone. There are two exceptions to this. In the young adults group there is a stronger association between BIS index and EEG gamma than there is between BIS index and EMG. In the elderly group, the state of consciousness is equally associated with EEG gamma and EMG recorded from the Masseter, but not with the EMG recorded from Fpz.

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Pritchett S, Zilberg E, Xu M, Burton D, Brown I, Myles P. Power analysis of gamma frequencies (30-47Hz), adjusting for muscle activity (80-97Hz), in anesthesia: A comparison between young adults, middle-aged and the elderly. In Proceedings of the 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'08. 2008. p. 825-830. 4649281