BACKGROUND: Malformations of cortical development have characteristic interictal discharges, yet the mechanisms of generation of these discharges are not known in humans. Interictal discharges in malformations of cortical development were studied with EEG-fMRI. METHODS: Six subjects with malformations of cortical development and seizures were studied using spike-triggered fMRI at 3 T. The blood oxygen level-dependent (BOLD) signal changes associated with interictal discharges were measured. RESULTS: All subjects showed spike-related BOLD signal changes. In four subjects, the signal increases were seen in the lesion, and in four subjects, decreases were seen surrounding the lesion. Five subjects had BOLD signal changes at distant cortical sites and three had subcortical changes (basal ganglia, reticular formation, or thalamic). CONCLUSION: BOLD signal changes may be directly correlated with overall synaptic activity. Changes were found in and around the lesion of malformations of cortical development and in distant cortical and subcortical structures. The results suggest that EEG-fMRI studies might help elucidate the mechanisms of epileptic discharges in humans.
BACKGROUND:Malformations of cortical development have characteristic interictal discharges, yet the mechanisms of generation of these discharges are not known in humans. Interictal discharges in malformations of cortical development were studied with EEG-fMRI. METHODS: Six subjects with malformations of cortical development and seizures were studied using spike-triggered fMRI at 3 T. The blood oxygen level-dependent (BOLD) signal changes associated with interictal discharges were measured. RESULTS: All subjects showed spike-related BOLD signal changes. In four subjects, the signal increases were seen in the lesion, and in four subjects, decreases were seen surrounding the lesion. Five subjects had BOLD signal changes at distant cortical sites and three had subcortical changes (basal ganglia, reticular formation, or thalamic). CONCLUSION: BOLD signal changes may be directly correlated with overall synaptic activity. Changes were found in and around the lesion of malformations of cortical development and in distant cortical and subcortical structures. The results suggest that EEG-fMRI studies might help elucidate the mechanisms of epileptic discharges in humans.
Authors: Amos D Korczyn; Steven C Schachter; Jana Amlerova; Meir Bialer; Walter van Emde Boas; Milan Brázdil; Eylert Brodtkorb; Jerome Engel; Jean Gotman; Vladmir Komárek; Ilo E Leppik; Petr Marusic; Stefano Meletti; Birgitta Metternich; Chris J A Moulin; Nils Muhlert; Marco Mula; Karl O Nakken; Fabienne Picard; Andreas Schulze-Bonhage; William Theodore; Peter Wolf; Adam Zeman; Ivan Rektor Journal: Epilepsy Behav Date: 2015-08-11 Impact factor: 2.937
Authors: Amir Omidvarnia; Mangor Pedersen; David N Vaughan; Jennifer M Walz; David F Abbott; Andrew Zalesky; Graeme D Jackson Journal: Hum Brain Mapp Date: 2017-07-24 Impact factor: 5.038
Authors: Robert C Wykes; Hui Ming Khoo; Lorenzo Caciagli; Hal Blumenfeld; Peyman Golshani; Jaideep Kapur; John M Stern; Andrea Bernasconi; Stefanie Dedeurwaerdere; Neda Bernasconi Journal: Epilepsia Date: 2019-06-09 Impact factor: 5.864