Anesthetic action on the transmission delay between cortex and thalamus explains the beta-buzz observed under propofol anesthesia.
In recent years, more and more surgeries under general anesthesia have been performed with the assistance of electroencephalogram (EEG) monitors. An increase in anesthetic concentration leads to characteristic changes in the power spectra of the EEG. Although tracking the anesthetic-induced changes...
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Public Library of Science (PLoS)
2017-01-01
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| Series: | PLoS ONE |
| Online Access: | https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0179286&type=printable |
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| author | Meysam Hashemi Axel Hutt Darren Hight Jamie Sleigh |
| author_facet | Meysam Hashemi Axel Hutt Darren Hight Jamie Sleigh |
| author_sort | Meysam Hashemi |
| collection | DOAJ |
| description | In recent years, more and more surgeries under general anesthesia have been performed with the assistance of electroencephalogram (EEG) monitors. An increase in anesthetic concentration leads to characteristic changes in the power spectra of the EEG. Although tracking the anesthetic-induced changes in EEG rhythms can be employed to estimate the depth of anesthesia, their precise underlying mechanisms are still unknown. A prominent feature in the EEG of some patients is the emergence of a strong power peak in the β-frequency band, which moves to the α-frequency band while increasing the anesthetic concentration. This feature is called the beta-buzz. In the present study, we use a thalamo-cortical neural population feedback model to reproduce observed characteristic features in frontal EEG power obtained experimentally during propofol general anesthesia, such as this beta-buzz. First, we find that the spectral power peak in the α- and δ-frequency ranges depend on the decay rate constant of excitatory and inhibitory synapses, but the anesthetic action on synapses does not explain the beta-buzz. Moreover, considering the action of propofol on the transmission delay between cortex and thalamus, the model reveals that the beta-buzz may result from a prolongation of the transmission delay by increasing propofol concentration. A corresponding relationship between transmission delay and anesthetic blood concentration is derived. Finally, an analytical stability study demonstrates that increasing propofol concentration moves the systems resting state towards its stability threshold. |
| format | Article |
| id | doaj-art-4c998032fc8d49649aad169bbd585a0d |
| institution | DOAJ |
| issn | 1932-6203 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj-art-4c998032fc8d49649aad169bbd585a0d2025-08-20T03:13:19ZengPublic Library of Science (PLoS)PLoS ONE1932-62032017-01-01126e017928610.1371/journal.pone.0179286Anesthetic action on the transmission delay between cortex and thalamus explains the beta-buzz observed under propofol anesthesia.Meysam HashemiAxel HuttDarren HightJamie SleighIn recent years, more and more surgeries under general anesthesia have been performed with the assistance of electroencephalogram (EEG) monitors. An increase in anesthetic concentration leads to characteristic changes in the power spectra of the EEG. Although tracking the anesthetic-induced changes in EEG rhythms can be employed to estimate the depth of anesthesia, their precise underlying mechanisms are still unknown. A prominent feature in the EEG of some patients is the emergence of a strong power peak in the β-frequency band, which moves to the α-frequency band while increasing the anesthetic concentration. This feature is called the beta-buzz. In the present study, we use a thalamo-cortical neural population feedback model to reproduce observed characteristic features in frontal EEG power obtained experimentally during propofol general anesthesia, such as this beta-buzz. First, we find that the spectral power peak in the α- and δ-frequency ranges depend on the decay rate constant of excitatory and inhibitory synapses, but the anesthetic action on synapses does not explain the beta-buzz. Moreover, considering the action of propofol on the transmission delay between cortex and thalamus, the model reveals that the beta-buzz may result from a prolongation of the transmission delay by increasing propofol concentration. A corresponding relationship between transmission delay and anesthetic blood concentration is derived. Finally, an analytical stability study demonstrates that increasing propofol concentration moves the systems resting state towards its stability threshold.https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0179286&type=printable |
| spellingShingle | Meysam Hashemi Axel Hutt Darren Hight Jamie Sleigh Anesthetic action on the transmission delay between cortex and thalamus explains the beta-buzz observed under propofol anesthesia. PLoS ONE |
| title | Anesthetic action on the transmission delay between cortex and thalamus explains the beta-buzz observed under propofol anesthesia. |
| title_full | Anesthetic action on the transmission delay between cortex and thalamus explains the beta-buzz observed under propofol anesthesia. |
| title_fullStr | Anesthetic action on the transmission delay between cortex and thalamus explains the beta-buzz observed under propofol anesthesia. |
| title_full_unstemmed | Anesthetic action on the transmission delay between cortex and thalamus explains the beta-buzz observed under propofol anesthesia. |
| title_short | Anesthetic action on the transmission delay between cortex and thalamus explains the beta-buzz observed under propofol anesthesia. |
| title_sort | anesthetic action on the transmission delay between cortex and thalamus explains the beta buzz observed under propofol anesthesia |
| url | https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0179286&type=printable |
| work_keys_str_mv | AT meysamhashemi anestheticactiononthetransmissiondelaybetweencortexandthalamusexplainsthebetabuzzobservedunderpropofolanesthesia AT axelhutt anestheticactiononthetransmissiondelaybetweencortexandthalamusexplainsthebetabuzzobservedunderpropofolanesthesia AT darrenhight anestheticactiononthetransmissiondelaybetweencortexandthalamusexplainsthebetabuzzobservedunderpropofolanesthesia AT jamiesleigh anestheticactiononthetransmissiondelaybetweencortexandthalamusexplainsthebetabuzzobservedunderpropofolanesthesia |