Electrocerebral activity only in response to stimulation and only at the vertex electrode

This patient sustained a severe infarction, and an EEG carried out with accepted criteria by the American EEG Society ws consistent with electrocerebral inactivity. A repeat record demonstrated that activity was apparent mainly in a single electrode after stimulation. In this case, it was the vertex electrode that was active. The rest of the electrodes were inactive with the patient at rest and reflected little or no activity in response to stimulation. In this case at least, the persistence of EEG activity after stimulation had no prognostically favorable value in that the patient died.