Fig. 2. Electroencephalographic recording during the inadvertent administration of lidocaine into the right internal carotid artery (note electroencephalographic technician's notation of “brevital 8 mg” in the record). Approximately 2 s after the injection, there is irregular, semirhythmic 4-Hz sharp and slow waves over the right hemisphere that are maximal over the right frontal and parasagittal areas.