Clinical Significance of Periodic EEG Patterns

doi:10.1001/archneur.1980.00500500045005

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Vol. 37 No. 1, January 1980

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Clinical Significance of Periodic EEG Patterns

Yoshiyuki Kuroiwa, MD; Gastone G. Celesia, MD

Arch Neurol. 1980;37(1):15-20.

Abstract

• Generalized and focal periodic EEG patterns were studiedin 62 patients. Generalized periodic suppression bursts andgeneralized periodic slow-wave complexes (GPSC) occurred inpatients under anesthesia or drug intoxication, and with anoxic/metabolicencephalopathies. When these conditions were excluded, GPSCindicated the diagnosis of subacute sclerosing panencephalitisor other encephalitides. Suppression bursts in comatose patientsafter cardiorespiratory arrest indicate an unfavorable outcome.Generalized periodic triphasic waves occurred only in patientswith metabolicanoxic encephalopathies. Generalized repetitivesharp transients were observed in patients with anoxic encephalopathy.Periodic lateralized epileptiform discharges (26 cases) wereassociated with clinical seizures in 24 cases and were notedalmost exclusively in destructive hemispherical lesions. Periodicityrepresents a profound disruption of normal electrophysiologicalrhythms and indicates either structural or functional involvementof cortical and subcortical structures.

Author Affiliations

From the Department of Neurology, St Louis University, and Veterans Administration Hospital, St Louis. Dr Celesia is now with the Department of Neurology, William S. Middleton Memorial Veterans Hospital, Madison, Wis.

Footnotes

Accepted for publication Dec 28, 1978.

Read before the 32nd annual meeting of the American EEG Society,San Francisco, Sept 8, 1978.

Reprint requests to Department of Neurology, William S. MiddletonMemorial Veterans Hospital, 2500 Overlook Terr, Madison, WI53705 (Dr Celesia).

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