Spectral analysis of sphenoidal evoked potentials predicts XXXX focus.

@entity1 @entity410 @entity1315 @entity302
Sphenoidal evoked potentials (SpEPs) were recorded in 14 @entity1 with intractable @entity1315 . Twelve @entity1 had electrographically proven unilateral @entity410 onset (five left, seven right). Two @entity1 had partial complex @entity410 and unilateral mesial temporal lobe lesions shown by magnetic resonance imaging (MRI). Thirteen @entity1 subsequently underwent temporal lobectomy. SpEPs were recorded using the P3 tonal oddball paradigm from sphenoidal electrodes referenced to scalp electrodes (i.e., T3, T4, C3, C4, Cz) and were subjected to spectral analysis for whole band (1-12.6 Hz) power. A significant relationship was found for side of @entity410 focus and reduced spectral power of the sphenoidal-temporal target SpEPs. In 10 of 14 @entity1 , SpEP spectral power was less from the "epileptogenic" than from the "nonepileptogenic" temporal lobe. Of the remaining 4 @entity1 , 2 had bilaterally equal spectral power, and 2 had lower SpEP power from the nonepileptogenic side. Postoperatively, all 13 @entity1 are @entity410 -free except for the 2 @entity1 with reduced SpEP power opposite to the ictal onset and 1 @entity1 with fluctuations in SpEP asymmetries. Spectral analysis of SpEPs appears to have utility in the assessment of @entity1315 and thus in the preoperative evaluation for @entity302 surgery.
