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Patrick Chauvel

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https://www.readbyqxmd.com/read/30242045/theta-bursts-precede-and-spindles-follow-cortical-and-thalamic-downstates-in-human-nrem-sleep
#1
Chris Gonzalez, Rachel Mak-McCully, Burke Rosen, Sydney S Cash, Patrick Chauvel, Hélène Bastuji, Marc Rey, Eric Halgren
Since their discovery, slow oscillations have been observed to group spindles during non-REM sleep. Previous studies assert that the slow oscillation downstate (DS) is preceded by slow spindles (10-12Hz), and followed by fast spindles (12-16Hz). Here, using both direct transcortical recordings in patients with intractable epilepsy (n=10, 8 female), as well as scalp EEG recordings from a healthy cohort (n=3, 1 female), we find in multiple cortical areas that both slow and fast spindles follow the DS. Although discrete oscillations do precede DSs, they are theta bursts (TB) centered at 5-8Hz...
September 21, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/30140590/-arc-de-cercle-as-a-manifestation-of-focal-epileptic-seizures
#2
Elia M Pestana Knight, Olesya Grinenko, Juan Bulacio, William Bingaman, Ajay Gupta, Patrick Chauvel
No abstract text is available yet for this article.
August 2018: Neurology. Clinical Practice
https://www.readbyqxmd.com/read/30107554/generating-genomic-platforms-to-study-candida-albicans-pathogenesis
#3
Mélanie Legrand, Sophie Bachellier-Bassi, Keunsook K Lee, Yogesh Chaudhari, Hélène Tournu, Laurence Arbogast, Hélène Boyer, Murielle Chauvel, Vitor Cabral, Corinne Maufrais, Audrey Nesseir, Irena Maslanka, Emmanuelle Permal, Tristan Rossignol, Louise A Walker, Ute Zeidler, Sadri Znaidi, Floris Schoeters, Charlotte Majgier, Renaud A Julien, Laurence Ma, Magali Tichit, Christiane Bouchier, Patrick Van Dijck, Carol A Munro, Christophe d'Enfert
No abstract text is available yet for this article.
September 19, 2018: Nucleic Acids Research
https://www.readbyqxmd.com/read/29985998/high-frequency-stimulation-of-anterior-nucleus-of-thalamus-desynchronizes-epileptic-network-in-humans
#4
Tao Yu, Xueyuan Wang, Yongjie Li, Guojun Zhang, Gregory Worrell, Patrick Chauvel, Duanyu Ni, Liang Qiao, Chang Liu, Liping Li, Liankun Ren, Yuping Wang
Epilepsy has been classically seen as a brain disorder resulting from abnormally enhanced neuronal excitability and synchronization. Although it has been described since antiquity, there are still significant challenges achieving the therapeutic goal of seizure freedom. Deep brain stimulation of the anterior nucleus of the thalamus has emerged as a promising therapy for focal drug-resistant epilepsy; the basic mechanism of action, however, remains unclear. Here, we show that desynchronization is a potential mechanism of deep brain stimulation of the anterior nucleus of the thalamus by studying local field potentials recordings from the cortex during high-frequency stimulation (130 Hz) of the anterior nucleus of the thalamus in nine patients with drug-resistant focal epilepsy...
September 1, 2018: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29982705/generating-genomic-platforms-to-study-candida-albicans-pathogenesis
#5
Mélanie Legrand, Sophie Bachellier-Bassi, Keunsook K Lee, Yogesh Chaudhari, Hélène Tournu, Laurence Arbogast, Hélène Boyer, Murielle Chauvel, Vitor Cabral, Corinne Maufrais, Audrey Nesseir, Irena Maslanka, Emmanuelle Permal, Tristan Rossignol, Louise A Walker, Ute Zeidler, Sadri Znaidi, Floris Schoeters, Charlotte Majgier, Renaud A Julien, Laurence Ma, Magali Tichit, Christiane Bouchier, Patrick Van Dijck, Carol A Munro, Christophe d'Enfert
The advent of the genomic era has made elucidating gene function on a large scale a pressing challenge. ORFeome collections, whereby almost all ORFs of a given species are cloned and can be subsequently leveraged in multiple functional genomic approaches, represent valuable resources toward this endeavor. Here we provide novel, genome-scale tools for the study of Candida albicans, a commensal yeast that is also responsible for frequent superficial and disseminated infections in humans. We have generated an ORFeome collection composed of 5099 ORFs cloned in a Gateway™ donor vector, representing 83% of the currently annotated coding sequences of C...
August 21, 2018: Nucleic Acids Research
https://www.readbyqxmd.com/read/29392713/insulo-opercular-cortex-generates-oroalimentary-automatisms-in-temporal-seizures
#6
Jerome Aupy, Ika Noviawaty, Balu Krishnan, Piradee Suwankpakdee, Juan Bulacio, Jorge Gonzalez-Martinez, Imad Najm, Patrick Chauvel
OBJECTIVE: Oroalimentary automatisms (OAAs) resembling normal alimentary behavior are stereotyped complex movements that may occur during epileptic seizures. They are considered common clinical signs in temporal lobe seizures, but their anatomofunctional mechanisms are not established. We took the opportunity of presurgical intracerebral recordings to study the relations between the occurrence of OAAs and temporal/spatial features of ictal activities. METHODS: We retrospectively reviewed patients with medically intractable medial temporal lobe epilepsy who underwent stereoelectroencephalography (SEEG) at Cleveland Clinic between 2009 and 2016...
March 2018: Epilepsia
https://www.readbyqxmd.com/read/29289424/french-guidelines-on-stereoelectroencephalography-seeg-editorial-comment
#7
EDITORIAL
Patrick Chauvel, Sylvain Rheims, Aileen McGonigal, Philippe Kahane
No abstract text is available yet for this article.
February 2018: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29128469/the-different-patterns-of-seizure-induced-aphasia-in-temporal-lobe-epilepsies
#8
Agnès Trebuchon, Isabelle Lambert, Bernard Guisiano, Aileen McGonigal, Charline Perot, Francesca Bonini, Romain Carron, Catherine Liegeois-Chauvel, Patrick Chauvel, Fabrice Bartolomei
OBJECTIVES: Ictal language disturbances may occur in dominant hemisphere temporal lobe epilepsy (TLE), but little is known about the precise anatomoelectroclinical correlations. This study investigated the different facets of ictal aphasia in intracerebrally recorded TLE. METHODS: Video-stereoelectroencephalography (SEEG) recordings of 37 seizures in 17 right-handed patients with drug-resistant TLE were analyzed; SEEG electroclinical correlations between language disturbance and involvement of temporal lobe structures were assessed...
January 2018: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29111409/mulan-evaluation-and-ensemble-statistical-inference-for-functional-connectivity
#9
Huifang E Wang, Karl J Friston, Christian G Bénar, Marmaduke M Woodman, Patrick Chauvel, Viktor Jirsa, Christophe Bernard
Many analysis methods exist to extract graphs of functional connectivity from neuronal networks. Confidence in the results is limited because, (i) different methods give different results, (ii) parameter setting directly influences the final result, and (iii) systematic evaluation of the results is not always performed. Here, we introduce MULAN (MULtiple method ANalysis), which assumes an ensemble based approach combining multiple analysis methods and fuzzy logic to extract graphs with the most probable structure...
February 1, 2018: NeuroImage
https://www.readbyqxmd.com/read/29039074/the-usefulness-of-stereo-electroencephalography-seeg-in-the-surgical-management-of-focal-epilepsy-associated-with-hidden-temporal-pole-encephalocele-a-case-report-and-literature-review
#10
REVIEW
João Paulo Sant Ana Santos de Souza, Jeff Mullin, Connor Wathen, Juan Bulacio, Patrick Chauvel, Lara Jehi, Jorge Gonzalez-Martinez
The authors report a case of 18-year-old woman with partial complex seizures compatible with temporal epilepsy by semiology. Due to medical refractoriness, she was referred to pre-surgical evaluation. Initially, MRI showed no significant structural abnormality and superficial scalp EEG demonstrated epileptiform activity in the frontotemporal areas. Due to the lack of clear MRI abnormalities and the potential involvement of dominant mesial temporal structures by seizure semiology and non-invasive data, extra-operative invasive evaluation using stereo-electroencephalography (SEEG) methodology was indicated...
January 2018: Neurosurgical Review
https://www.readbyqxmd.com/read/28950221/spontaneous-seizure-remission-following-status-epilepticus-in-drug-resistant-epilepsy-due-to-focal-cortical-dysplasia
#11
Nadine Girard, Eric Guedj, Patrick Chauvel, Fabrice Bartolomei, Aileen McGonigal
We describe a patient with chronic pharmacoresistant epilepsy related to right parietal focal cortical dysplasia (FCD), who became seizure-free following an episode of convulsive status epilepticus (SE). Magnetic resonance imaging (MRI) and fludeoxyglucose positron emission tomography (FDG-PET) were performed before and after SE. Longitudinal MRI scans showed a stable appearance of the FCD with no new signal change. However, diffusion tensor imaging showed altered white matter fiber tract orientation in posterior cortices, especially in proximity to the lesion, at 3 years post-SE...
November 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28673029/predictive-factors-of-surgical-outcome-in-frontal-lobe-epilepsy-explored-with-stereoelectroencephalography
#12
Francesca Bonini, Aileen McGonigal, Didier Scavarda, Romain Carron, Jean Régis, Henry Dufour, Jean-Claude Péragut, Virginie Laguitton, Nathalie Villeneuve, Patrick Chauvel, Bernard Giusiano, Agnès Trébuchon, Fabrice Bartolomei
BACKGROUND: Resective surgery established treatment for pharmacoresistant frontal lobe epilepsy (FLE), but seizure outcome and prognostic indicators are poorly characterized and vary between studies. OBJECTIVE: To study long-term seizure outcome and identify prognostic factors. METHODS: We retrospectively analyzed 42 FLE patients having undergone surgical resection, mostly preceded by invasive recordings with stereoelectroencephalography (SEEG)...
August 1, 2018: Neurosurgery
https://www.readbyqxmd.com/read/28591484/safety-and-efficacy-of-gamma-knife-radiosurgery-in-hypothalamic-hamartomas-with-severe-epilepsies-a-prospective-trial-in-48-patients-and-review-of-the-literature
#13
REVIEW
Jean Régis, Medhi Lagmari, Romain Carron, Motohiro Hayashi, Aileen McGonigal, Géraldine Daquin, Nathalie Villeneuve, Virginie Laguitton, Fabrice Bartolomei, Patrick Chauvel
Epilepsies associated with hypothalamic hamartomas (HHs) are frequently drug resistant with severe psychiatric and cognitive comorbidities. We performed a prospective trial to evaluate the safety and efficacy of Gamma Knife radiosurgery (GKS). Between October 1999 and October 2007, a total of 57 patients were investigated, included and treated by GKS in Timone University Hospital. Preoperative workup and 3-year postoperative evaluation consisted of seizure diary, neuropsychological, psychiatric, endocrinologic, visual field, and visual acuity examinations...
June 2017: Epilepsia
https://www.readbyqxmd.com/read/28541306/coordination-of-cortical-and-thalamic-activity-during-non-rem-sleep-in-humans
#14
Rachel A Mak-McCully, Matthieu Rolland, Anna Sargsyan, Chris Gonzalez, Michel Magnin, Patrick Chauvel, Marc Rey, Hélène Bastuji, Eric Halgren
Every night, the human brain produces thousands of downstates and spindles during non-REM sleep. Previous studies indicate that spindles originate thalamically and downstates cortically, loosely grouping spindle occurrence. However, the mechanisms whereby the thalamus and cortex interact in generating these sleep phenomena remain poorly understood. Using bipolar depth recordings, we report here a sequence wherein: (1) convergent cortical downstates lead thalamic downstates; (2) thalamic downstates hyperpolarize thalamic cells, thus triggering spindles; and (3) thalamic spindles are focally projected back to cortex, arriving during the down-to-upstate transition when the cortex replays memories...
May 25, 2017: Nature Communications
https://www.readbyqxmd.com/read/28445741/memory-scrutinized-through-electrical-brain-stimulation-a-review-of-80-years-of-experiential-phenomena
#15
REVIEW
Jonathan Curot, Thomas Busigny, Luc Valton, Marie Denuelle, Jean-Pierre Vignal, Louis Maillard, Patrick Chauvel, Jérémie Pariente, Agnès Trebuchon, Fabrice Bartolomei, Emmanuel J Barbeau
Electrical brain stimulations (EBS) sometimes induce reminiscences, but it is largely unknown what type of memories they can trigger. We reviewed 80 years of literature on reminiscences induced by EBS and added our own database. We classified them according to modern conceptions of memory. We observed a surprisingly large variety of reminiscences covering all aspects of declarative memory. However, most were poorly detailed and only a few were episodic. This result does not support theories of a highly stable and detailed memory, as initially postulated, and still widely believed as true by the general public...
July 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28409231/preoperative-right-ventricular-dysfunction-is-a-strong-predictor-of-3-years-survival-after-cardiac-surgery
#16
Jérôme Peyrou, Christophe Chauvel, Atul Pathak, Marc Simon, Patrick Dehant, Eric Abergel
BACKGROUND: Prognostic value of right ventricular (RV) systolic function is well established in valvular disease, heart failure but has not been evaluated in patients undergoing cardiac surgery. OBJECTIVES: The aim of the present study was to evaluate the prognostic value of preoperative RV dysfunction extensively evaluated on the basis of a large set of echocardiographic parameters [S', RV fractional area change (RVFAC), right myocardial performance index (RMPI), isovolumic acceleration (IVA), RV dP/dt and basal longitudinal strain (BLS)] in a large population of unselected patient awaiting cardiac surgery...
September 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/28032677/hippocampus-duality-memory-and-novelty-detection-are-subserved-by-distinct-mechanisms
#17
Emmanuel J Barbeau, Patrick Chauvel, Christopher J A Moulin, Jean Regis, Catherine Liégeois-Chauvel
The hippocampus plays a pivotal role both in novelty detection and in long-term memory. The physiological mechanisms underlying these behaviors have yet to be understood in humans. We recorded intracerebral evoked potentials within the hippocampus of epileptic patients (n = 10) during both memory and novelty detection tasks (targets in oddball tasks). We found that memory and detection tasks elicited late local field potentials in the hippocampus during the same period, but of opposite polarity (negative during novelty detection tasks, positive during memory tasks, ∼260-600 ms poststimulus onset, P < 0...
April 2017: Hippocampus
https://www.readbyqxmd.com/read/27918346/electrical-stimulation-for-seizure-induction-and-functional-mapping-in-stereoelectroencephalography
#18
REVIEW
Agnès Trébuchon, Patrick Chauvel
The challenge in epilepsy surgery is to remove the epileptogenic zone without compromising postoperative function. Electrical stimulation (ES) was developed to identify with greater anatomical and physiological precision cortical structures essential to language and motor function. Because the language network is widely distributed in the left (dominant) hemisphere, and often varies among patients, brain mapping should delineate eloquent areas at the individual level. Although ES for language is commonly performed during a presurgical investigation, the procedure remains nonstandardized among centers, and differences between grids and intracerebral depth electrodes (stereoelectroencephalography) should be taken into account when comparing results from different series...
December 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27918345/stereoelectroencephalography-interpretation
#19
REVIEW
Juan C Bulacio, Patrick Chauvel, Aileen McGonigal
Intracranial EEG has been in use for more than 50 years in the presurgical evaluation of patients with medically intractable focal epilepsy. The stereoelectroencephalography (SEEG) method has expanded very significantly over the last 5 years, in parallel with the increase in the number of complex cases (i.e., MRI-negative) being referred with medically intractable focal epilepsy to major epilepsy surgery centers. Some centers with extensive experience in subdural electrodes are indeed changing or have changed to SEEG as the principal exploration technique, which suggests that SEEG might offer specific benefits through its approach to accurately localizing the epileptogenic zone...
December 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27406939/seizure-onset-patterns-in-focal-cortical-dysplasia-and-neurodevelopmental-tumors-relationship-with-surgical-prognosis-and-neuropathologic-subtypes
#20
Stanislas Lagarde, Francesca Bonini, Aileen McGonigal, Patrick Chauvel, Martine Gavaret, Didier Scavarda, Romain Carron, Jean Régis, Sandrine Aubert, Nathalie Villeneuve, Bernard Giusiano, Dominique Figarella-Branger, Agnès Trebuchon, Fabrice Bartolomei
OBJECTIVES: The study of intracerebral electroencephalography (EEG) seizure-onset patterns is crucial to accurately define the epileptogenic zone and guide successful surgical resection. It also raises important pathophysiologic issues concerning mechanisms of seizure generation. Until now, several seizure-onset patterns have been described using distinct recording methods (subdural, depth electrode), mostly in temporal lobe epilepsies or with heterogeneous neocortical lesions. METHODS: We analyzed data from a cohort of 53 consecutive patients explored by stereoelectroencephalography (SEEG) and with pathologically confirmed malformation of cortical development (MCD; including focal cortical dysplasia [FCD] and neurodevelopmental tumors [NDTs])...
September 2016: Epilepsia
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