• The first report of electroencephalographic findings in clinically encountered phencyclidine intoxication is presented. When first seen, the patient was in a coma, initially distinguished only by nystagmus, waxy rigidity of the extremities, and an EEG with a widespread, sinusoidal theta rhythm interrupted every few seconds by periodic slow-wave complexes. The similarity of the EEG to that of deep ketamine anesthesia suggested intoxication with a ketamine-related (phenylcyclohexylamine) drug. Phencyclidine, the prototype of the phenylcyclohexylamine compounds and a widely abused hallucinogen, was subsequently identified in the urine and blood.
Stockard JJ, Werner SS, Aalbers JA, Chiappa KH. Electroencephalographic Findings in Phencyclidine Intoxication. Arch Neurol. 1976;33(3):200–203. doi:10.1001/archneur.1976.00500030056012
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