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British Journal of Anaesthesia, 1973, Vol. 45, No. 7 664-670
© 1973 The Board of Management and Trustees of the British Journal of Anaesthesia

other

THE USE OF ON-LINE TELEPHONIC COMPUTER ANALYSIS OF THE E.E.G. IN ANAESTHESIA

R. R. MYERS, B.S.E.E., J. J. STOCKARD, B.A., N. I. FLEMING*, C. J. FRANCE, M.B., B.CHIR., F.F.A.R.C.S. and R. G. BICKFORD, M.B., B.CHIR., F.R.C.P.

Department of Applied Mechanics and Engineering Science (including Bio-engineering), School of Medicine San Diego, La Jolla, California.
School of Medicine San Diego, La Jolla, California.
Department of Anesthesia; University of California San Diego, La Jolla, California.
Department of Neurosciences; University of California San Diego, La Jolla, California.

*Present address: Digital Equipment Corporation, Santa Ana, California.

Clinical application of electroencephalographic monitoring has generally been restricted by the complexity of on-line unprocessed data analysis. A technique has been developed which expands the applicability of clinical e.e.g. monitoring and presents the clinician with an e.e.g. spectral analysis designed specifically for readability in a dynamic environment. In this technique, one or more channels of electroencephalographic data are amplified, frequency-modulated and transmitted over a standard unprocessed, voice grade, direct distance dialling telephone line to a PDP-12 computer (8k memory). This information is processed in 4- or 8-second blocks using fast Fourier transform methods to present a power spectral plot of 0–16 Hertz bandwidth. Successive blocks of data are analysed similarly and plotted by computer direction to give a continuous record of the e.e.g. spectrum. These spectrum plots are simultaneously retransmitted over the same telephone line to the e.e.g. transmission location and plotted on a Y-T recorder. This system is currently being used in the operating room to guide the induction of safe, effective anaesthesia and ensure the adequacy of cerebral oxygenation.


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