However, the simultaneous use of both techniques has become increasingly common. Subdural electrodes are usually better suited for evaluations of the cerebral surface across one or two lobes and when the evaluation must include an extraoperative mapping of cerebral function, as is possible by stimulating through the subdural electrodes. Regions that are not on the lateral cerebral surface include the medial surfaces and three-dimensionally complex abnormalities, such as schizencephalies. In general, depth electrodes are more helpful when the potentially epileptogenic region is not across the lateral cerebral surface, extends across much of a hemisphere, or includes regions of both hemispheres. The decision whether to use depth or subdural electrodes depends on which method best tests the hypothesis and provides the most useful information regarding the location and extent of the epileptogenic zone. When deciding whether a discharge is epileptiform, neurologists should look for waves with an asymmetric contour that. Both depth and grid/strip EEG techniques are indicated for patients who are considering epilepsy surgery due to medication refractory seizures, whose noninvasive evaluation has not led to an adequate localization of the epileptogenic zone, yet provides sufficient evidence to produce a plausible hypothesis for the epileptogenic zone's location.
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