Abstract:
OBJECTIVE:To determine predictors of focal to bilateral tonic-clonic seizures (FBTCS) during video-electroencephalography (EEG) monitoring (VEM). METHODS:All adult patients undergoing presurgical VEM from 2014 to 2015 in the department of epileptology were eligible (N = 229). Those with refractory focal epilepsy and epileptic seizures recorded during VEM were analyzed (N = 188, Group 1). To assess the effects of antiepileptic drug (AED) taper, the total AED load was calculated as the sum of the ratios of prescribed daily dose and defined daily dose of all AEDs per VEM day and was correlated with the occurrence of focal seizures without bilateral tonic-clonic seizures (FwoBTCS) and FBTCS. To validate the findings, data of patients undergoing VEM in 2004 and 2005 (Group 2, eligible N = 243, analyzed N = 203) were also investigated. RESULTS:In Group 1, 53 patients had FBTCS and 135 patients had exclusively FwoBTCS during VEM. Reduced AED load at seizure onset was the most important modifiable risk factor for FBTCS (receiver-operating characteristic [ROC]: area under the curve [AUC] = 0.78). Furthermore, the risk of FBTCS varied with the history and frequency of FBTCS prior to VEM. For instance, patients had a 50% risk of FBTCS by reducing the AED load to ~20% when no information about history of FBTCS was taken into account, to ~30% when a positive history of FBTCS was taken into account, and to ~50% when a high frequency of FBTCS prior to VEM was taken into account. These findings were largely replicated in Group 2 (59 patients with FBTCS and 144 exclusively with FwoBTCS). SIGNIFICANCE:The risk of FTBCS during VEM depends on the history and frequency of FTBCS prior to VEM and is particularly associated with the extent of AED reduction. Our data underscore the need for appropriate tapering regimens in VEM units.
journal_name
Epilepsiajournal_title
Epilepsiaauthors
Pensel MC,Schnuerch M,Elger CE,Surges Rdoi
10.1111/epi.16454subject
Has Abstractpub_date
2020-03-01 00:00:00pages
489-497issue
3eissn
0013-9580issn
1528-1167journal_volume
61pub_type
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