Subdural Electrodes for Seizure Focus Localization

Rosenbaum, Thomas J.; Laxer, Kenneth D.; Vessely, Michelle B.; Smith, W. Brewster

doi:10.1227/00006123-198607000-00011

Cited by 70 publications

(11 citation statements)

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“…As a second hypothesis, repeated seizures could have slightly displaced electrode S, which may have ultimately torn a neighboring vessel. The abrupt changes of electrical activity recording on electrode S may be ascribed to its displacement, as has been previously reported with subdural 15,17 or intracerebral 2,11 invasive monitoring. In our case the fact that the bleeding occurred early after an epileptic seizure supports this hypothesis.…”

Section: Discussionsupporting

confidence: 69%

Delayed intracranial hematoma following stereoelectroencephalography for intractable epilepsy

Derrey¹,

Lebas²,

Parain³

et al. 2012

PED

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Intracranial bleeding following stereoelectroencephalography (sEEG) is rare and commonly occurs early after electrode implantation. The authors report the case of a delayed intracranial hematoma following sEEG. This 10-year-old boy was referred to the authors' department to undergo an sEEG study for intractable epilepsy, with the hypothesis of a single localized epileptic zone in the left precentral region. To perform the exploration, 14 depth electrodes were implanted under stereotactic conditions. The results of a postoperative CT scan performed routinely at the end of the surgical procedure were normal. Eight days later, following an epileptic seizure, the child's condition worsened. The neurological examination revealed a left hemiparesis, agitation, and coma due to a right subdural hematoma with intraparenchymal bleeding. Despite a surgical evacuation followed by a decompressive craniectomy, the curative treatments were stopped 1 week later due to severe diffuse ischemic lesions found on MRI studies. This is the first observation of a delayed hematoma following an sEEG procedure. The mechanism underlying this complication remains unclear, but the rupture of a growing pseudoaneurysm caused by the electrode's implantation or the tearing of a neighboring vessel by an electrode were suspected. In consequence, physicians must remain vigilant during the entire sEEG recording period and probably also several days after electrode removal.

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Section: Discussionsupporting

confidence: 69%

Delayed intracranial hematoma following stereoelectroencephalography for intractable epilepsy

Derrey¹,

Lebas²,

Parain³

et al. 2012

PED

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“…The approach to investigation with scalp and intracranial electrodes used at UCSF has been previously reported. 16 Patients were considered to have nonlesional, effectively unilateral TLE based on the following criteria: At UCSF, patients are selected for standard anteriormedial temporal lobe resection based on ictal electrophysiologic localization. Imaging, psychometric, and Wada examinations are only used to provide outcome and neurologic risk information to patients before they make a decision to proceed with surgery.…”

Section: Methods Patients and Epilepsy Evaluationmentioning

confidence: 99%

In vivo hippocampal glucose metabolism in mesial temporal lobe epilepsy

Knowlton¹,

Laxer²,

Klein

et al. 2001

Neurology

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“…Phase II investigation can involve invasive neurological testing where investigators chemically turn off specific brain structures with local injections for better "listening" to other structures or to assess the laterality of some brain functions 14 . Phase II assessment can also rely on investigative neurosurgical techniques with depth electrodes or grids being implanted directly in contact with the cortex or the brain structures under scrutiny 9,15,16 . These techniques and their integration with non-invasive data will be further developed and addressed in this paper.…”

Section: Phase II Investigationmentioning

confidence: 99%

<title>Model-based multiconstrained integration of invasive electrophysiology with other modalities</title>

Bidaut

2001

SPIE Proceedings

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Following recent developments, most brain imaging modalities (MR, CT, SPECT, PET) can nowadays be registered and integrated in a manner almost simple enough for routine use. By design though, these modalities are still not able to match the principles and near real-time capabilities of the much simpler (but of lower spatial resolution) EEG, thus the need to integrate it as well, along with -for some patients -the more accurate invasive electrophysiology measurements taken directly in contact with brain structures.A standard control CT (or MR) is routinely performed after the implantation of invasive electrodes. After registration with the other modalities, the initial estimates of the electrodes' locations extracted from the CT (or MR) are iteratively improved by using a geometrical model of the electrodes' arrangement (grids, strips, etc.) and other optional constraints (morphology, etc.).Unlike the direct 3D pointing of each electrode in the surgical suite -which can still act as a complementary approachthis technique estimates the most likely location of the electrodes during monitoring and can also deal with non cortical arrangements (internal strips, depth electrodes, etc.).Although not always applicable to normal volunteers because of its invasive components, this integration further opens the door towards an improved understanding of a very complex biological system.

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Subdural Electrodes for Seizure Focus Localization

Cited by 70 publications

References 0 publications

Delayed intracranial hematoma following stereoelectroencephalography for intractable epilepsy

Delayed intracranial hematoma following stereoelectroencephalography for intractable epilepsy

In vivo hippocampal glucose metabolism in mesial temporal lobe epilepsy

<title>Model-based multiconstrained integration of invasive electrophysiology with other modalities</title>

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