Method and apparatus for the estimation of anesthetic depth using wavelet analysis of the electroencephalogram
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United States of America Patent
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May 13, 2008
Grant Date -
Jan 15, 2004
app pub date -
Jul 11, 2003
filing date -
Jul 12, 2002
priority date (Note) -
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Abstract
A method and apparatus to monitor the neurologic state of a patient undergoing general anesthesia is provided. Previous automated systems to monitor the neurologic state of a patient undergoing general anesthesia involve a significant time delay between the patient's true hypnotic state and the computed indices. The present invention reduces this time delay by using a different analysis technique applied to spontaneous EEG. A wavelet decomposition and statistical analysis of the observed EEG is conducted and compared to reference data to provide a numerical indicator. In addition, this indicator is more consistent with the patient's loss of consciousness indicated by the loss of count event than previous systems.
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