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Direct comparison of 3- and 8-channel ambulatory cassette EEG with intensive inpatient monitoring

Epilepsy Center, West Haven VA Medical Center and the Department of Neurology, Yale University School of Medicine, New Haven, CT.

During the intensive monitoring of 30 patients by means of cable telemetry EEG, simultaneous 3- and 8-channel ambulatory EEG recordings were also obtained. Blinded interpretations of the cassette tapes were compared with those of the cable telemetry records. Both 3- and 8-channel ambulatory EEG reviews correctly identified 93% of the records as either normal or epileptiform. Lateralization of abnormalities was equally good with either cassette system, but more detailed characterization was achieved with 8-channel ambulatory EEG. Although 100% of seizures were detected on both systems, there were more false-positive errors when only three data channels were available. Better ability to differentiate real abnormalities from artifacts was the most significant advantage of 8-channel over 3- to 4-channel ambulatory EEG.

Address correspondence and reprint requests to Dr. Ebersole, Epilepsy Center, VA Medical Center, West Haven, CT 06516.

Dr. Bridgers is the recipient of a Merritt-Putnam Clinical Research Fellowship from the Epilepsy Foundation of America.

Presented in part at the annual meeting of the American Electroencephalographic Society, New Orleans, LA, October 1983.

Accepted for publication October 4, 1984.

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