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JOURNAL ARTICLE
REVIEW
SEEG-guided radiofrequency thermocoagulation.
Clinical Neurophysiology 2018 Februrary
We propose expert recommendations on the use of SEEG-guided radiofrequency thermocoagulation (RF-TC) based on an exhaustive literature review. This technique consists in performing a RF-TC lesion using a SEEG depth electrode at the end of the recording. It is indicated when conventional surgical resection of the ictal onset zone is not possible. SEEG guided RF-TC can also be considered as a diagnostic tool since an improvement, even limited, has a high positive predictive value concerning the good outcome after surgery. It is possible to perform SEEG only in the purposes of performing RF-TC. An over-implantation of the presumed ictal onset zone is possible when such a procedure is planned. The RF-TC target should only be defined based on the ictal activity, except when a type II focal cortical dysplasia electrophysiological interictal signature is recorded. A single or multiple coagulations should always be performed between contiguous electrode contacts. The power delivered by the generator should be increased until the impedance suddenly changes, which indicates that the thermocoagulation has occurred. The procedure should be performed under clinical monitoring without anesthesia and after systematically testing neurological functions by electric stimulation on each target. Multiple SEEG-guided RF-TC can be proposed in a single patient, for example, in cases of relapse after a previous effective procedure. Conventional resection surgery remains feasible after a RF-TC procedure.
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