EFFECT OF ANESTHESIA ON CHAOTIC DYNAMICS IN FINGER PLETHYSMOGRAMS

Mayumi Oyama-Higa, Tiejun Miao, Akira Imanishi, Junji Kojima

2009

Abstract

Chaotic dynamics in finger plethysmogram system was studied in relation to anesthesia processes. The experiments were conducted to observe the changes in finger plethysmogram before, during, and after the anesthesia for a surgery. The largest Lyapunov exponent of the plethysmograms was found to be significant and can be used to correlate the temporal variations of mental/physical status in the processes. There were lower values o f Lyapunov exponents during anesthesia, showing the block effect of anesthesia on central nervous system. There were highly Lyapunov exponents in recovery consciousness from anesthesia. To understand how the chaos arises and to explain the changes in the Lyapunov exponent in finger plethysmograms in experiments, a mathematical model consisting of baroreflex feedback and autonomous interactions was proposed and studied numerically. The decrease of the largest Lyapunov exponent in plethysmograms was explained successfully by the model in relation to the decreased chaoticity, and hence the depressed or blocked central nervous system in higher cerebral region.

Paper Citation

in Harvard Style

Oyama-Higa M., Miao T., Imanishi A. and Kojima J. (2009). EFFECT OF ANESTHESIA ON CHAOTIC DYNAMICS IN FINGER PLETHYSMOGRAMS . In Proceedings of the 4th International Conference on Software and Data Technologies - Volume 2: ACT4SOC-EHST, (ICSOFT 2009) ISBN 978-989-674-010-8, pages 400-405. DOI: 10.5220/0002265604000405

in Bibtex Style

@conference{act4soc-ehst09,
author={Mayumi Oyama-Higa and Tiejun Miao and Akira Imanishi and Junji Kojima},
title={EFFECT OF ANESTHESIA ON CHAOTIC DYNAMICS IN FINGER PLETHYSMOGRAMS},
booktitle={Proceedings of the 4th International Conference on Software and Data Technologies - Volume 2: ACT4SOC-EHST, (ICSOFT 2009)},
year={2009},
pages={400-405},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0002265604000405},
isbn={978-989-674-010-8},
}

in EndNote Style

TY - CONF
JO - Proceedings of the 4th International Conference on Software and Data Technologies - Volume 2: ACT4SOC-EHST, (ICSOFT 2009)
TI - EFFECT OF ANESTHESIA ON CHAOTIC DYNAMICS IN FINGER PLETHYSMOGRAMS
SN - 978-989-674-010-8
AU - Oyama-Higa M.
AU - Miao T.
AU - Imanishi A.
AU - Kojima J.
PY - 2009
SP - 400
EP - 405
DO - 10.5220/0002265604000405