The value of nasopharyngeal recording in psychiatric patients.

The utility of nasopharyngeal (NP) recording in psychiatry is controversial. To assess its value, 302 NP recordings from patients with psychiatric illnesses were reviewed. Among the 81 patients whose electroencephalograms (EEGs) demonstrated spikes or sharp waves, 10 patients (12%) were found to have epileptic foci at the mesiobasal temporal region recorded exclusively by NP leads. However, all of these recordings showed additional independent epileptic foci detected by scalp electrodes. Five patients (6%) had epileptic discharges simultaneously recorded from NP and scalp electrodes. No recording showed all epileptic discharges to be exclusively recorded by NP leads. These findings suggest that although NP recording may not be absolutely required to determine if an EEG contains epileptiform discharges, in a psychiatric population, it may be useful to detect additional epileptic foci at the mesiobasal temporal region.