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  • Bedside physiologic monitors designed for continuous measurement and display of information of the electrical activity of the brain and the associated electroencephalogram (EEG) that can perform a computerized spectrum analysis and are hard-wired to the patient at the bedside. These monitors include a central unit with electronic circuits that can process a signal from electrodes that are usually placed on a patient\'s scalp and/or forehead. Spectral EEG monitors typically make a computerized spectrum analysis that separates the spectrum into its sine and cosine components (i.e., Fourier analysis). The displayed signal may include bar graphs, a compressed spectral array (CSA), or a density spectral array (DSA). Spectral electroencephalography monitors are used to facilitate the detection and evaluation of changes in the EEG signals. The monitors may be used as a component of a physiologic monitoring system that also includes a central station and/or auxiliary displays. Some intraoperative spectral analysis monitors can also perform a bispectral analysis, a signal-processing technique that provides an index which correlates with the degree of awareness of anesthetized patients.
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