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Neurophysiologie Clinique, Clinical Neurophysiology

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https://www.readbyqxmd.com/read/29352627/indications-and-limits-of-stereoelectroencephalography-seeg
#1
REVIEW
Lorella Minotti, Alexandra Montavont, Julia Scholly, Louise Tyvaert, Delphine Taussig
Epilepsy surgery is now an accepted treatment to achieve seizure control in carefully selected patients, both children and adults, suffering from drug-resistant focal epilepsy. Although surgical strategies can often be defined on the basis of non-invasive diagnostic procedures, and despite the recent advances in this field, an increasing number of more complex cases requires invasive EEG (iEEG) to provide precise information on the localization of the epileptogenic zone (EZ), its relationships with eloquent cortex (EC), and the feasibility of a tailored surgical resection...
January 15, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29289424/french-guidelines-on-stereoelectroencephalography-seeg-editorial-comment
#2
EDITORIAL
Patrick Chauvel, Sylvain Rheims, Aileen McGonigal, Philippe Kahane
No abstract text is available yet for this article.
December 27, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29289423/interpretation-of-seeg-recordings
#3
REVIEW
Fabrice Bartolomei, Anca Nica, Maria Paola Valenti-Hirsch, Claude Adam, Marie Denuelle
The interpretation of SEEG recordings is a crucial step. It must be carried out by an epileptologist/neurophysiologist with sufficient training and qualification in this field. The objectives of the interpretation are to define the brain topography of interictal activities (irritative zone) and the epileptogenic zone, defined as the site of primary organization of ictal discharges. Several patterns of seizure onset are possible, the most typical including fast discharges. The interpretation of the SEEG is based on the recording of spontaneous activity but also on the results of intracerebral electrical stimulation...
December 27, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29277357/french-guidelines-on-stereoelectroencephalography-seeg
#4
REVIEW
Jean Isnard, Delphine Taussig, Fabrice Bartolomei, Pierre Bourdillon, Hélène Catenoix, Francine Chassoux, Mathilde Chipaux, Stéphane Clémenceau, Sophie Colnat-Coulbois, Marie Denuelle, Stéphane Derrey, Bertrand Devaux, Georg Dorfmüller, Vianney Gilard, Marc Guenot, Anne-Sophie Job-Chapron, Elisabeth Landré, Axel Lebas, Louis Maillard, Aileen McGonigal, Lorella Minotti, Alexandra Montavont, Vincent Navarro, Anca Nica, Nicolas Reyns, Julia Scholly, Jean-Christophe Sol, William Szurhaj, Agnès Trebuchon, Louise Tyvaert, Maria Paola Valenti-Hirsch, Luc Valton, Jean-Pierre Vignal, Paul Sauleau
Stereoelectroencephalography (SEEG) was designed and developed in the 1960s in France by J. Talairach and J. Bancaud. It is an invasive method of exploration for drug-resistant focal epilepsies, offering the advantage of a tridimensional and temporally precise study of the epileptic discharge. It allows anatomo-electrical correlations and tailored surgeries. Whereas this method has been used for decades by experts in a limited number of European centers, the last ten years have seen increasing worldwide spread of its use...
December 22, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29274767/development-of-corticospinal-motor-excitability-and-cortical-silent-period-from-mid-childhood-to-adulthood-a-navigated-tms-study
#5
Laura Säisänen, Petro Julkunen, Timo Lakka, Virpi Lindi, Mervi Könönen, Sara Määttä
OBJECTIVES: We characterized the maturation of the excitability of the motor cortex and corticospinal tract from childhood to adulthood using electric field (EF) navigated TMS and correlated the results with manual dexterity. METHODS: Both hemispheres of healthy right-handed children (6-9 years, n=10), preadolescents (10-12 years, n=13), adolescents (14-17 years, n=12) and young adults (22-34 years, n=12) of both genders were examined. The optimal cortical representation site and resting motor threshold (rMT) were determined for the abductor pollicis brevis muscle...
December 20, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29273384/surgical-technique
#6
REVIEW
Marc Guénot, Axel Lebas, Bertrand Devaux, Sophie Colnat-Coulbois, Georg Dorfmuller, Aileen McGonigal, Nicolas Reyns, Vianney Gilard, Stéphane Derrey, Jean-Christophe Sol, Stéphane Clémenceau
In SEEG, as for any surgical procedure, the benefit/risk ratio is a key-point. This implies rigorous clinical practice in terms of indication, information delivered to the patient, and surgical technique. Numerous technical options may be used to achieve this goal. All are valuable, as long as they are executed with rigor and consistency. Intracranial bleeding represents the main risk of the procedure (1-4% of cases). The procedure also carries a risk of infection (0.8%), death (total of 6 reported cases in all the literature, <0...
December 19, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29273383/seeg-guided-radiofrequency-thermocoagulation
#7
REVIEW
Pierre Bourdillon, Bertrand Devaux, Anne-Sophie Job-Chapron, Jean Isnard
We propose expert recommendations on the use of SEEG-guided radiofrequency thermocoagulation (RF-TC) based on an exhaustive literature review. This technique consists in performing a RF-TC lesion using a SEEG depth electrode at the end of the recording. It is indicated when conventional surgical resection of the ictal onset zone is not possible. SEEG guided RF-TC can also be considered as a diagnostic tool since an improvement, even limited, has a high positive predictive value concerning the good outcome after surgery...
December 19, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29254836/the-influence-of-the-site-of-conditioning-sensory-stimuli-on-prepulse-modulation-of-the-blink-reflex
#8
LETTER
Meral E Kızıltan, Ayşegül Gündüz
No abstract text is available yet for this article.
December 15, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29254835/planning-and-management-of-seeg
#9
REVIEW
Francine Chassoux, Vincent Navarro, Hélène Catenoix, Luc Valton, Jean-Pierre Vignal
Stereoelectroencephalography (SEEG) aims to define the epileptogenic zone (EZ), to study its relationship with functional areas and the causal lesion and to evaluate the possibility of surgical therapy. Planning of exploration is based on the validity of the hypotheses developed from electroclinical and imaging correlations. Further investigations can refine the implantation plan (e.g. fluorodeoxyglucose positron emission tomography [FDG-PET], single photon emission computerized tomography [SPECT], magnetoencephalography [MEG] and high resolution electroencephalography [EEG-HR])...
December 15, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29254834/electrophysiological-technical-procedures
#10
REVIEW
Elisabeth Landré, Mathilde Chipaux, Louis Maillard, William Szurhaj, Agnès Trébuchon
The reliability of the interpretation of SEEG data depends entirely on the technical quality of the acquisition recording. Digitalization of data and the development of computer technology, over the last 20 years have transformed electrophysiological procedures. Recording equipment must be able to record concomitantly clinical events and brain electrical activity. Recording is carried out during wakefulness and sleep and with use of various activation methods (hyperventilation, intermittent photic stimulation)...
December 15, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29249575/combined-cardiovascular-and-sweating-autonomic-testing-to-differentiate-multiple-system-atrophy-from-parkinson-s-disease
#11
Anne Pavy-LeTraon, Christine Brefel-Courbon, Julia Dupouy, Fabienne Ory-Magne, Olivier Rascol, Jean-Michel Senard
OBJECTIVES: It can be difficult to differentiate multiple system atrophy (MSA) with predominant parkinsonism (MSA-P), a very disabling but rare disease, from Parkinson's disease (PD). Autonomic dysfunction, particularly cardiovascular autonomic neuropathy (CAN), is classically more pronounced in MSA. We investigated whether testing for CAN combined with sweat function assessment was helpful to differentiate patients with MSA from those with PD. METHODS: In this retrospective study, 62 patients with MSA-P and 96 with PD, comparable in age, BMI and sex ratio with disease duration of 4...
December 14, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29248202/clonidine-administration-during-intraoperative-monitoring-for-pediatric-scoliosis-surgery-effects-on-central-and-peripheral-motor-responses
#12
Pedro Calderón, Paul Deltenre, Ida Stany, Jean-Paul Kaleeta Maalu, Magali Stevens, Jean Lamoureux, Michel Bellemans, Sylvie Dujardin, Philippe Van der Linden, Bernard Dachy
OBJECTIVE: To study the effect of clonidine administrated as a co-analgesic during scoliosis surgery, on the neuromonitoring of spinal motor pathways. METHODS: Using standardized intraoperative monitoring, we compared the time course of peripherally and transcranially electrically evoked motor potentials (TcEMEPs) before and after injection of a single bolus of clonidine in children under total intravenous anesthesia (TIVA). MEP data were obtained from 9 patients and somatosensory evoked potentials (SSEPs) were obtained from 2 patients...
December 13, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29248201/safety-and-effects-on-motor-cortex-excitability-of-five-cathodal-transcranial-direct-current-stimulation-sessions-in-25hours
#13
Filippo Zappasodi, Gabriella Musumeci, Riccardo Navarra, Vincenzo Di Lazzaro, Massimo Caulo, Antonino Uncini
OBJECTIVE: To assess the safety and effects on motor cortex excitability of five cathodal-tDCS sessions (charge density 342.9C/m2) delivered over the dominant motor cortex with a return electrode over the ipsilateral shoulder at increasing time intervals in 25hours. METHODS: Safety was operatively defined as absence of serious adverse events related to tDCS including brain tissue alterations documentable by magnetic resonance imaging and spectroscopy. Effects on motor cortex excitability were evaluated by motor evoked potential (MEP) amplitude...
December 13, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29173870/a-reappraisal-of-small-and-large-fiber-damage-in-carpal-tunnel-syndrome-new-insights-into-the-value-of-the-emla-test-for-improving-diagnostic-sensitivity
#14
Leila Triki, Hela G Zouari, Rim Kammoun, Firas Kammoun, Ines Kammoun, Kaouthar Masmoudi, Jean-Pascal Lefaucheur
OBJECTIVES: To reappraise the respective involvement of small- and large-fiber damage in carpal tunnel syndrome (CTS) and to determine the diagnostic sensitivity of autonomic tests compared to conventional nerve conduction study (NCS). METHODS: Thirty-two manual workers complaining of at least unilateral CTS were enrolled. They underwent clinical interview and completed the symptom severity scale of the Boston CTS Questionnaire (sssBCTQ) and the Neuropathic Pain Symptom Inventory (NPSI)...
November 23, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29157784/deriving-muscle-fiber-diameter-from-recorded-single-fiber-potential
#15
Ewa Zalewska
OBJECTIVE: The aim of the study was to estimate muscle fiber diameters through analysis of single muscle fiber potentials (SFPs) recorded in the frontalis muscle of a healthy subject. METHODS: Our previously developed analytical and graphic method to derive fiber diameter from the analysis of the negative peak duration and the amplitude of SFP, was applied to a sample of ten SFPs recorded in vivo. RESULTS: Muscle fiber diameters derived from the simulation method for the sample of frontalis muscle SFPs are consistent with anatomical data for this muscle...
November 17, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29111397/book-review-atlas-of-electroencephalography-volume-1-second-edition-awake-and-sleep-eeg-activation-procedures-and-artifacts
#16
LETTER
Samar S Ayache, Moussa A Chalah
No abstract text is available yet for this article.
October 27, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29111396/limitations-and-pitfalls-of-the-pedicle-screw-testing-monitoring-technique-an-in-vivo-and-in-vitro-study
#17
Julie Zyss, Isabelle Bernat, Stéphane Wolff, Guillaume Riouallon, Hugues Pascal-Moussellard
OBJECTIVES: Pedicle screw testing is a widely used technique in the field of neuromonitoring for spinal surgery. It was designed by Calancie et al. (1992) in order to detect pedicle breach, one of the major complications of pedicle screw fixation, which can lead to neurological impairment. However, numerous false negative and equivocal results led to its clinical relevance being questioned. We aimed to clarify these discrepancies and characterize electrical parameters underlying this technique...
October 27, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29169769/online-denoising-of-eye-blinks-in-electroencephalography
#18
Quentin Barthélemy, Louis Mayaud, Yann Renard, Daekeun Kim, Seung-Wan Kang, Jay Gunkelman, Marco Congedo
OBJECTIVE: Due to its high temporal resolution, electroencephalography (EEG) has become a broadly-used technology for real-time brain monitoring applications such as neurofeedback (NFB) and brain-computer interfaces (BCI). However, since EEG signals are prone to artifacts, denoising is a crucial step that enables adequate subsequent data processing and interpretation. The aim of this study is to compare manual denoising to unsupervised online denoising, which is essential to real-time applications...
December 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29029883/brain-sexual-differentiation-and-effects-of-cross-sex-hormone-therapy-in-transpeople-a-resting-state-functional-magnetic-resonance-study
#19
Nienke M Nota, Sarah M Burke, Martin den Heijer, Remi S Soleman, Cornelis B Lambalk, Peggy T Cohen-Kettenis, Dick J Veltman, Baudewijntje P Kreukels
OBJECTIVES: It is hypothesized that transpeople show sex-atypical differentiation of the brain. Various structural neuroimaging studies provide support for this notion, but little is known about the sexual differentiation of functional resting-state networks in transpeople. In this study we therefore aimed to determine whether brain functional connectivity (FC) patterns in transpeople are sex-typical or sex-atypical, before and after the start of cross-sex hormone therapy (CHT). METHODS: We acquired resting-state functional magnetic resonance data in 36 transpeople (22 with female sex assigned at birth), first during gonadal suppression, and again four months after start of CHT, and in 37 cisgender people (20 females), both sessions without any hormonal intervention...
October 10, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/28958790/difference-between-individuals-with-left-and-right-hemiparesis-in-the-effect-of-gluteus-medius-vibration-on-body-weight-shifting
#20
I Bonan, S Butet, K Jamal, A Yelnik, S Tasseel Ponche, S Leplaideur
OBJECTIVE: To test the effect of gluteus medius (GM) vibration on the reduction of asymmetric body weight distribution in individuals with hemiparesis (HP) at two stages of postural recovery. METHODS: The effects of GM vibration according to the shift of the body weight (%Shift) onto the paretic leg during GM vibration were registered while standing on a force-platform in 40 HP (19 left and 21 right; mean age 54.7±10.6years, mean time after stroke 2.0±1.3months), as soon as they could stand without assistance and 4 to 6 weeks later, and in 40 control subjects (mean age 54...
September 25, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
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