Publication date: Available online 29 December 2016
Source:Clinical Neurophysiology
Author(s): A Valentín, N Hernando, J Moles, D Jimenez-Jimenez, S Mourente, I Malik, RP Selway, G Alarcón
ObjectiveTo study retrospectively the impact of electrode modality (subdural or depth electrodes) during presurgical assessment on surgical outcome after temporal lobectomy.MethodsThe study included 17 patients assessed with depth electrodes and 57 with bitemporal subdural strips.ResultsMRI showed a larger proportion of bilateral pathology in patients undergoing depth recordings (29.41% versus 3.5%, p=0.00069). Among the operated patients, those undergoing depth electrode recordings showed better outcome at one year after surgery (11/12 versus 22/33; p= 0.046). This difference disappears at longest follow up (10/12 versus 22/33; p=0.138). Moreover, the probability of undergoing surgery and having good outcome after assessment with intracranial recordings is higher for the depth electrode group at one-year follow up (11/17 versus 22/57; p= 0.029) but statistical differences decrease to a trend for the longest follow up (10/17 versus 22/57; p= 0.069). No other statistical differences were noted between subdural and depth electrodes. Depth electrodes showed lower complication rates than subdural electrodes.ConclusionBoth depth and subdural electrodes are effective for presurgical assessment of temporal lobe epilepsy.SignificanceAssessment with depth electrodes is associated with slightly increased likelihood of surgery and marginally better surgical outcome at one year follow up which disappears for longer follow up periods. Initial assessment with depth electrodes would have avoided a second implantation in 15% of patients.
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Medicine by Alexandros G. Sfakianakis,Anapafseos 5 Agios Nikolaos 72100 Crete Greece,00302841026182,00306932607174,alsfakia@gmail.com,
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