Transverse topographical analysis of petit mal discharges: Diagnostical and pathogenic implications

Dondey, M

doi:10.1016/0013-4694(83)90123-2

Cited by 14 publications

(3 citation statements)

References 22 publications

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“…JME is a type of IGE. Frontal maximal activity in frontal surface electrodes has been shown in previous studies of patients with absence seizures and generalized SWC 4,6 . Only patients with JME and PSWC were included in our study, their EEG recordings showed a characteristic frontal maximum voltage localized in Fz, F3 and F4 electrodes, similar to the one found in patients with absence seizures.…”

Section: Discussionmentioning

confidence: 54%

“…Jasper 3 described frontal and parieto-occipital phase reversals of SWC, and bilateral propagation was achieved in 20 milliseconds, proposing the centroencephalic hypothesis of generalized epilepsies. Years later, EEG studies of the spatial distribution of SWC and PSWC in childhood absences and other IGE syndromes, detected a frontal distributed paroxysmal activity in IGE [4][5][6] . In recent years, brain topographic maps and source analysis with dipole modeling have been used [7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

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Source analysis of polyspike and wave complexes in juvenile myoclonic epilepsy

Santiago-Rodríguez

Harmony

Fernández-Bouzas³

et al. 2002

Seizure

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We applied dipole modeling and brain distributed source analysis to find current sources comprising spikes and slow waves of polyspike and wave complexes (PSWC) in patients with juvenile myoclonic epilepsy (JME). The dipoles were localized in frontal, parietal and temporal lobes. The frontal dipoles were clustered in the frontal medial gyrus and fronto-orbital region. A midsagittal frontal current source was observed using brain distributed source analysis in all patients. When the slow wave was analyzed, multiple sources in different cortical regions were detected using dipole modeling and brain distributed analysis. These results show pre-frontal medial current sources corresponding to spikes and many diffuse sources in cortical regions corresponding to wave components of PSWC in patients with JME.

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Section: Discussionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Source analysis of polyspike and wave complexes in juvenile myoclonic epilepsy

Santiago-Rodríguez

Harmony

Fernández-Bouzas³

et al. 2002

Seizure

View full text Add to dashboard Cite

show abstract

“…In 1968, Gloor [9] proposed the term "cortico-reticular" generalized epilepsy in order to indicate an abnormal interaction between the cortex and the thalamic and mesencephalic nuclei with wi-despread projections. It is well known from classical EEG studies that the spike of 3/s sw complexes is better recorded in the midfrontal area [5,17] and that, before the development of 3/s sw complex sequences, frontal focal abnormalities are frequently evident [10] and 72% of patients with absences show a peak of activity on the frontal midline [4]. It is well known from classical EEG studies that the spike of 3/s sw complexes is better recorded in the midfrontal area [5,17] and that, before the development of 3/s sw complex sequences, frontal focal abnormalities are frequently evident [10] and 72% of patients with absences show a peak of activity on the frontal midline [4].…”

Section: Introductionmentioning

confidence: 99%

Topographic EEG mapping of 3/s spike-and-wave complexes during absence seizures

1995

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Topographic color mapping has recently been introduced for the study of ictal EEG manifestations of absences. We recorded 2-4 3/s spike-and-wave (sw) bursts in 12 patients with absence epilepsy, and performed a spectral analysis of the EEG under baseline conditions and during the 2 sec preceding the 3/s sw bursts. An increase in delta and theta bands was found in preseizure conditions. Moreover, the serial mapping of the sw complexes showed a different field distribution of the various components when the first sw was compared with the subsequent ones. In particular, the negative peak of the spike was mainly frontal during the first complex, with a tangentially oriented dipole, but it became better represented over the midline in the following sw, with a radially oriented dipole. We conclude that EEG changes can be detected before the onset of 3/s sw activity in absences, and that they are probably related to the strong inhibitory mechanisms acting in this type of seizure; moreover a frontal cortical mechanism seems to be prevalently active at the beginning of the seizure, which is soon captured by a cortico-subcortical process as the attack progresses.

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Neurosurgical applications of topographic mapping

Matsumoto

1990

Brain Topogr

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Sophisticated spectral analysis and mapping of the EEG with computer techniques provides objective and reliable diagnostic information, which is superior to that obtained by naked-eye observation, even by experienced clinicians. In our department, a topographic system was introduced as one of major adjuncts to EEG examination in 1980, and we devised our own software (dynamic topography, compound dynamic topography, deviation ratio topography) to facilitate its clinical application. Topographic mapping is applied to assessment of the dominant hemisphere, evaluation after medical and surgical treatment, spatial localization of epileptic foci, and intraoperative monitoring for cerebral hypoperfusion. Besides these surgical applications, topographic analysis has contributed to human neurophysiology, for instance in determining the participation of the dentatethalamic tract in movement-related cortical potentials. Our experience of the neurosurgical and neurophysiological applications of topographic mapping will be presented.

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Transverse topographical analysis of petit mal discharges: Diagnostical and pathogenic implications

Cited by 14 publications

References 22 publications

Source analysis of polyspike and wave complexes in juvenile myoclonic epilepsy

Source analysis of polyspike and wave complexes in juvenile myoclonic epilepsy

Topographic EEG mapping of 3/s spike-and-wave complexes during absence seizures

Neurosurgical applications of topographic mapping

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