• Neuroreport · Mar 1999

    Monitoring of anaesthesia in neurophysiological experiments.

    • A Kral, J Tillein, R Hartmann, and R Klinke.
    • Physiologisches Institut III, J.W. Goethe-Universität, Frankfurt am Main, Germany.
    • Neuroreport. 1999 Mar 17;10(4):781-7.

    AbstractCortical activity can be substantially changed by the type of anaesthetic used, and by its dose level. For easy monitoring of depth of anaesthesia we describe the changes in electroencephalogram and electrocardiogram accompanying changes in depth of anaesthesia in the cat. Anaesthesia was induced by the volatile anaesthetic isoflurane. The high-frequency components (around 30 Hz) in the electroencephalogram disappear in deep anaesthesia. The electrocardiogram also shows substantial changes in contamination due to muscle fasciculations with anaesthesia level. Fasciculations appear as noise in the electrocardiogram. The amplitude of the electrical muscle activity contaminating the ECG can be easily used for the maintainance of a constant level of anaesthesia during a neurophysiological experiment.

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