Cerebral blood flow measured by Doppler flow meter during petit mal seizure.

We measured the cerebral blood flow velocity percutaneously using the Doppler ultrasound method while concurrently recording the EEG during seizures in two patients with petit mal epilepsy. The average maximal blood flow velocity (A/L) and end-diastolic blood flow velocity (d) of the internal carotid artery were measured. Somewhat increased A/L and d values were found at the onset of 3 Hz spike and wave bursts on EEG in one case. However, no increase or even reductions in A/L and d values were found during spontaneous petit mal seizures compared with interictal ones in the other case. These results are opposite to the previous other report.