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Stereotactic Eeg

C Ákos Szabó, Rachel Garvin, Shaheryar Hafeez, Ali Seifi, Linda Leary, Ratna Bhavaraju-Sanka, James M Henry, Alex M Papanastassiou
We describe a 23-year-old woman with previous right temporal lobe surgeries for underlying cortical dysplasia, presenting with drug-resistant right hemispheric seizures and epilepsia partialis continua (EPC). After anti-seizure medication adjustments, she developed focal status epilepticus with progressive EEG and neuroimaging changes. Cerebrospinal fluid and serum autoimmune panels were negative except for an elevated serum acetylcholine-receptor antibody titer, but she underwent immunosuppressive therapy...
2019: Epilepsy & Behavior Case Reports
Jun Thorsteinsdottir, Christian Vollmar, Jörg-Christian Tonn, Friedrich-Wilhelm Kreth, Soheyl Noachtar, Aurelia Peraud
BACKGROUND: Refined localization of the epileptogenic zone (EZ) in patients with pharmacoresistant focal epilepsy proceeding to resective surgery might improve postoperative outcome. We here report seizure outcome after stereo EEG (sEEG) evaluation with individually planned stereotactically implanted depth electrodes and subsequent tailored resection. METHODS: A cohort of consecutive patients with pharmacoresistant focal epilepsy, evaluated with a non-invasive evaluation protocol and invasive monitoring with personalized, stereotactically implanted depth electrodes for sEEG was analyzed...
January 30, 2019: Journal of Neurology
Nuria Lacuey, Johnson P Hampson, Ronald M Harper, Jonathan P Miller, Samden Lhatoo
OBJECTIVE: To precisely identify cortical regions that modulate breathing, and delineate a network of cortical structures that underpin ictal central apnea (ICA) during epileptic seizures. METHODS: We electrically stimulated multiple cortical structures in patients undergoing stereotactic EEG (SEEG) evaluation before epilepsy surgery. Structures investigated were orbitofrontal cortex, anterior and posterior cingulate and subcallosal gyri, insula, hippocampus, parahippocampal gyrus, amygdala, temporo-polar cortex, antero-mesial fusiform gyrus, and lateral and basal temporal cortices...
January 11, 2019: Neurology
Ching-Yi Lee, Han-Tao Li, Tony Wu, Mei-Yun Cheng, Siew-Na Lim, Shih-Tseng Lee
OBJECTIVERadiofrequency thermocoagulation (RFTC), which has been developed for drug-resistant epilepsy patients, involves less brain tissue loss due to surgery, fewer surgical adverse effects, and generally good seizure control. This study demonstrates the effectiveness of RFTC performed at limited hippocampal locations.METHODSDaily seizure diaries were prospectively maintained for at least 6 months by 9 patients (ages 30-59 years) with drug-resistant mesial temporal lobe epilepsy (MTLE) before treatment with RFTC...
October 1, 2018: Journal of Neurosurgery
Mark Quigg, Nicholas M Barbaro, Mariann M Ward, Edward F Chang, Donna K Broshek, John T Langfitt, Guofen Yan, Kenneth D Laxer, Andrew J Cole, Penny K Sneed, Christopher P Hess, Wei Yu, Steven A Newman, Susanne Mueller, Manjari Tripathi, Christiaanne N Heck, John W Miller, Paul A Garcia, Andrew McEvoy, Nathan B Fountain, Vincenta Salanova, Robert C Knowlton, Anto Bagić, Thomas Henry, Siddharth Kapoor, Guy McKhann, Adriana E Palade, Markus Reuber, Evelyn Tecoma
PURPOSE: Stereotactic radiosurgery (SRS) may be an alternative to anterior temporal lobectomy (ATL) for mesial temporal lobe epilepsy (MTLE). Visual field defects (VFD) occur in 9-100% of patients following open surgery for MTLE. Postoperative VFD after minimally invasive versus open surgery may differ. METHODS: This prospective trial randomized patients with unilateral hippocampal sclerosis and concordant video-EEG findings to SRS versus ATL. Humphries perimetry was obtained at 24 m after surgery...
October 31, 2018: Seizure: the Journal of the British Epilepsy Association
Ingrid Digernes, Endre Grøvik, Line B Nilsen, Cathrine Saxhaug, Oliver Geier, Edmund Reitan, Dag Ottar Sætre, Birger Breivik, Timothy Reese, Kari Dolven Jacobsen, Åslaug Helland, Kyrre Eeg Emblem
Purpose: This study aimed to investigate the hemodynamic status of cerebral metastases prior to and after stereotactic radiation surgery (SRS) and to identify the vascular characteristics that are associated with the development of pseudoprogression from radiation-induced damage with and without a radionecrotic component. Methods and materials: Twenty-four patients with 29 metastases from non-small cell lung cancer or malignant melanoma received SRS with dose of 15 Gy to 25 Gy...
October 2018: Advances in Radiation Oncology
Taku Inada, Takayuki Kikuchi, Katsuya Kobayashi, Takuro Nakae, Sei Nishida, Yuki Takahashi, Tamaki Kobayashi, Yasunori Nagai, Naoki Matsumoto, Akihiro Shimotake, Yukihiro Yamao, Kazumichi Yoshida, Takeharu Kunieda, Riki Matsumoto, Akio Ikeda, Susumu Miyamoto
In recent years, stereotactic electroencephalography(SEEG)has been focused on as a new invasive method for epileptic focus detection. Although the covering area of the brain surface is smaller than the invasive estimation with subdural electrodes, SEEG can evaluate foci that are deeply seated, noncontiguous leaves, and/or bilateral hemispheres. In addition, SEEG can capture consecutive changes in seizure activity in three dimensions. Due to the development of neuroimaging, computer-assisted, and robotic surgery technology, SEEG insertion began to be commonly used worldwide...
October 2018: No Shinkei Geka. Neurological Surgery
Jian Li, Justin Haldar, John C Mosher, Dileep Nair, Jorge Gonzalez-Martinez, Richard M Leahy
OBJECTIVE: Identification of networks from resting brain signals is an important step in understanding the dynamics of spontaneous brain activity. We approach this problem using a tensor-based model. METHODS: We develop a rank-recursive Scalable and Robust Sequential Canonical Polyadic Decomposition (SRSCPD) framework to decompose a tensor into several rank-1 components. Robustness and scalability are achieved using a warm start for each rank based on the results from the previous rank...
October 11, 2018: IEEE Transactions on Bio-medical Engineering
Stanislas Lagarde, Nicolas Roehri, Isabelle Lambert, Agnès Trebuchon, Aileen McGonigal, Romain Carron, Didier Scavarda, Mathieu Milh, Francesca Pizzo, Bruno Colombet, Bernard Giusiano, Samuel Medina Villalon, Maxime Guye, Christian-G Bénar, Fabrice Bartolomei
Drug-refractory focal epilepsies are network diseases associated with functional connectivity alterations both during ictal and interictal periods. A large majority of studies on the interictal/resting state have focused on functional MRI-based functional connectivity. Few studies have used electrophysiology, despite its high temporal capacities. In particular, stereotactic-EEG is highly suitable to study functional connectivity because it permits direct intracranial electrophysiological recordings with relative large-scale sampling...
October 1, 2018: Brain: a Journal of Neurology
Diana Pizarro, Adeel Ilyas, Emilia Toth, Andrew Romeo, Kristen O Riley, Rosana Esteller, Ioannis Vlachos, Sandipan Pati
BACKGROUND AND PURPOSE: Focal seizures can arise from coordinated activity across large-scale epileptic networks and propagate to regions that are not functionally altered but are recruited by epileptiform discharges. In preclinical models of focal epilepsy, the thalamus is recruited by cortical onset seizures, but it remains to be demonstrated in clinical studies. In this pilot study, the authors investigate whether seizures with onset within and outside the mesial temporal structures are detected in the anterior thalamus (ATN)...
October 2018: Epilepsy Research
Brad K Kamitaki, Santoshi Billakota, Lisa M Bateman, Alison M Pack
Expert consensus statements recommend continuous observation for patients undergoing intracranial electroencephalography (EEG), but this practice is neither universal nor specific regarding the type of observation. We compared outcomes for patients who underwent intracranial stereotactic EEG (SEEG) before and after the adoption of continuous monitoring by a staff bedside sitter. We retrospectively studied 26 consecutive adult patients who underwent SEEG placement at our center over a three-year period. Thirteen patients were monitored with usual protocol (no-sitter group), and 13 patients had a full-time hospital-employed sitter at bedside (sitter group)...
September 2018: Epilepsy & Behavior: E&B
James X Tao, Naoum P Issa, Shasha Wu, Sandra Rose, John Collins, Peter C Warnke
BACKGROUND AND IMPORTANCE: Corpus callosotomy is an effective palliative treatment for medically intractable Lennox-Gastaut syndrome (LGS) that disrupts the interhemispheric synchronization of epileptiform discharges. However, traditional open corpus callosotomy carries a significant risk of surgical complications associated with craniotomy and a parafalcine approach to the corpus callosum. Here, we report 2 cases of anterior corpus callosotomy using MRI-guided stereotactic laser interstitial thermal therapy (LITT) as a minimally invasive technique for mitigating the risks of craniotomy while achieving favorable outcomes...
July 5, 2018: Neurosurgery
Sebastian Michelmann, Matthias S Treder, Benjamin Griffiths, Casper Kerrén, Frédéric Roux, Maria Wimber, David Rollings, Vijay Sawlani, Ramesh Chelvarajah, Stephanie Gollwitzer, Gernot Kreiselmeyer, Hajo Hamer, Howard Bowman, Bernhard Staresina, Simon Hanslmayr
BACKGROUND: Intracranial recordings from patients implanted with depth electrodes are a valuable source of information in neuroscience. They allow for the unique opportunity to record brain activity with high spatial and temporal resolution. A common pre-processing choice in stereotactic EEG (S-EEG) is to re-reference the data with a bipolar montage. In this, each channel is subtracted from its neighbor, to reduce commonalities between channels and isolate activity that is spatially confined...
September 1, 2018: Journal of Neuroscience Methods
Manuel Hernández Salazar, Antonio Zarate Méndez, Oscar Meneses Luna, Lucía Ledesma Torres, Ramón Paniagua Sierra, Mary Carmen Sánchez Moreno, Juan Leonardo Serrato Avila
INTRODUCTION AND OBJECTIVES: The irreducible neuroaggressive disorder (IND) is a well-described entity known to be associated with impulsive and aggressive behavior. While various studies have assessed available pharmacological and non-pharmacological treatment regimens, patients with IND continue to pose a major threat to themselves and society. While targeted stereotactic therapy for IND has gained traction in recent years, there is a paucity of information describing comparative effectiveness of different validated anatomic regions...
June 18, 2018: Neurocirugía
Richard Wennberg, Lady D Ladino, José F Téllez-Zenteno
No abstract text is available yet for this article.
May 2018: Canadian Journal of Neurological Sciences. le Journal Canadien des Sciences Neurologiques
Stephan Meesters, Pauly Ossenblok, Albert Colon, Louis Wagner, Olaf Schijns, Paul Boon, Luc Florack, Andrea Fuster
OBJECTIVE: The interictal epileptic discharges (IEDs) occurring in stereotactic EEG (SEEG) recordings are in general abundant compared to ictal discharges, but difficult to interpret due to complex underlying network interactions. A framework is developed to model these network interactions. METHODS: To identify the synchronized neuronal activity underlying the IEDs, the variation in correlation over time of the SEEG signals is related to the occurrence of IEDs using the general linear model...
June 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
Sebahattin Karabulut, Ruslan Bayramov, Keziban Korkmaz Bayramov, Ahmet K Filiz, Ahmet S Taskiran, Ercan Ozdemir
Absence epilepsy is a generalized nonconvulsive type of epilepsy that is characterized by spike-wave discharges (SWD) with a frequency of 2.5-4 Hz in the EEG. The activation of the GABAergic system in central nervous system suppresses convulsive seizures but exacerbates absence seizures. Endogenous neuroactive steroids such as 3α-hydroxy-5α-pregnan-20-one (3α,5α-THPROG; allopregnanolone) and 3α,21-dihydroxy-5α-pregnan-20-one (3α,5α-THDOC, allotetrahydrodeoxycorticosteron) are GABA-A receptor-positive allosteric modulators...
March 2018: General Physiology and Biophysics
Jörg Wellmer
Small bottom-of-sulcus focal cortical dysplasias (BOS-FCD) type IIb are intrinsically epileptogenic lesions often responsible for pharmacoresistant epilepsy. They are increasingly well demarcated in vivo from surrounding cortex and white matter by 3 T magnetic resonance imaging (MRI). These facts and frequent seizure freedom after just narrow resections allow questioning the classical concept of epilepsy surgery in which the epileptogenic lesion is generally considered only one part of the epileptogenic zone and the resection volume categorically has to exceed lesion limits...
May 2018: Epilepsy Research
Firas Bannout, Sheri Harder, Michael Lee, Alexander Zouros, Ravi Raghavan, Travis Fogel, Kenneth De Los Reyes, Travis Losey
The neurosurgical treatment of skull base temporal encephalocele for patients with epilepsy is variable. We describe two adult cases of temporal lobe epilepsy (TLE) with spheno-temporal encephalocele, currently seizure-free for more than two years after anterior temporal lobectomy (ATL) and lesionectomy sparing the hippocampus without long-term intracranial electroencephalogram (EEG) monitoring. Encephaloceles were detected by magnetic resonance imaging (MRI) and confirmed by maxillofacial head computed tomography (CT) scans...
March 12, 2018: Brain Sciences
Josef Parvizi, Sabine Kastner
Intracranial electroencephalography (iEEG), also known as electrocorticography when using subdural grid electrodes or stereotactic EEG when using depth electrodes, is blossoming in various fields of human neuroscience. In this article, we highlight the potentials of iEEG in exploring functions of the human brain while also considering its limitations. The iEEG signal provides anatomically precise information about the selective engagement of neuronal populations at the millimeter scale and the temporal dynamics of their engagement at the millisecond scale...
April 2018: Nature Neuroscience
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