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Neurophysiologie Clinique, Clinical Neurophysiology

Camille Jeunet, Bertrand Glize, Aileen McGonigal, Jean-Marie Batail, Jean-Arthur Micoulaud-Franchi
Many Brain Computer Interface (BCI) and neurofeedback studies have investigated the impact of sensorimotor rhythm (SMR) self-regulation training procedures on motor skills enhancement in healthy subjects and patients with motor disabilities. This critical review aims first to introduce the different definitions of SMR EEG target in BCI/Neurofeedback studies and to summarize the background from neurophysiological and neuroplasticity studies that led to SMR being considered as reliable and valid EEG targets to improve motor skills through BCI/neurofeedback procedures...
November 7, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Charlotte Brevet-Aeby, Marine Mondino, Emmanuel Poulet, Jérome Brunelin
OBJECTIVE: We aimed to investigate whether the number of sessions delivered within one day influences the acute and long-term effects of transcranial random noise stimulation (tRNS) applied over the dorsolateral prefrontal cortex (DLPFC) on inhibitory control. METHODS: Thirty-six healthy participants were randomly assigned to receive either (i) 3 active (3A), (ii) 1 active and 2 sham (1A2S) or (iii) 3 sham (3S) tRNS sessions. The 3 tRNS were delivered consecutively in the same half-day separated by 30min with the anode over the right and the cathode over the left DLPFC...
November 7, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Simone Dalla Bella
Rhythmic abilities are highly widespread in the general population. Most people can extract the regular beat of music, and align their movements with it. The aim of a translational approach for music and movement is to build on current fundamental research and theories of beat perception and synchronization to devise music-based interventions, which are informed by theory. To illustrate this approach, Parkinson's disease is taken as a model, with a focus on the positive effects of rhythmic auditory cueing on walking...
November 2, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Julia Birchenall, Maxime Térémetz, Pauline Roca, Jean-Charles Lamy, Catherine Oppenheim, Marc A Maier, Jean-Louis Mas, Catherine Lamy, Jean-Claude Baron, Påvel G Lindberg
OBJECTIVES: In this longitudinal pilot study, we investigated how manual dexterity recovery was related to corticospinal tract (CST) injury and excitability, in six patients undergoing conventional rehabilitation. METHODS: Key components of manual dexterity, namely finger force control, finger tapping rate and independence of finger movements, were quantified. Structural MRI was obtained to calculate CST lesion load. CST excitability was assessed by measuring rest motor threshold (RMT) and the amplitude of motor evoked potentials (MEPs) using transcranial magnetic stimulation (TMS)...
October 31, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Eman M Khedr, Bastawy Al Fawal, Ahmed M Abdelwarith, Mostafa Saber, Abeer Abdel Hady Tony, Ahmed El-Bassiony, John C Rothwell
OBJECTIVES: It has recently been suggested that drug-induced tardive syndromes (TS) might be due to maladaptive plasticity, which increases motor excitability in cerebral cortex and basal ganglia. In order to test this hypothesis, we performed the first measurements of cortical excitability in TS. METHODS: Motor cortex excitability was examined using transcranial magnetic stimulation (TMS) in 22 TS patients and compared with that in 20 age and sex-matched healthy individuals...
October 23, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Ewa Zalewska, Malgorzata Gawel
OBJECTIVES: The aim of our study was to verify the effectiveness of single fiber potential (SFP) criteria in cases when the potential recorded using single fiber electrode (SFE) or concentric needle electrode (CNE) is contaminated by distant fibers. METHODS: Morphological counterparts of SFP were studied using computer simulations. In this study, we examined triphasic potentials using a model of a linear source of SFP. The criteria defining SFP in the case of SFP contaminated by distant fibers were analyzed, and the effect of second fiber contamination on jitter and fiber diameter determination evaluated...
October 13, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Tharapong Prajongkit, Montida Veeravigrom, Rujipat Samransamruajkit
OBJECTIVE: To determine the prognostic value of continuous electroencephalography (EEG) in children undergoing therapeutic hypothermia after cardiac arrest. METHOD: We retrospectively reviewed medical records and continuous EEG of all patients undergoing therapeutic hypothermia after cardiac arrest from November 2013 to September 2016. Demographic, clinical data and immediate complications were collected. Characteristics of continuous EEG including EEG background, time to normal trace (TTNT) and electrographic seizures were reviewed by investigators...
October 12, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Laure Peter-Derex, Hélène Catenoix, Hélène Bastuji, Florian Chouchou
OBJECTIVE: Differential diagnosis between sleep-related epileptic seizures and NREM parasomnia remains challenging. Pathophysiological markers to differentiate both conditions are needed. Activation of autonomic system is present in arousal reactions and epileptic seizures. Our study investigated whether cardiac reactivity differed between arousal disorders and sleep-related seizures. METHODS: Nocturnal recordings of 50 patients (10 in each group: frontal lobe epilepsy [FLE], temporal lobe epilepsy [TLE], nocturnal terror [NT], confusional arousal [CA], normal arousals [NA]) were retrospectively selected...
September 15, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Frederic Viseux, Franck Barbier, Philippe Villeneuve, Antoine Lemaire, Pascal Charpentier, Sebastien Leteneur
The purpose of the study was to evaluate the effect of an additional thickness placed under the toes (TUT) on the CoP measures and to determine the optimum thickness required to maximize the postural control performance. Four conditions were compared: TUT 0 (control), 0.8, 3, and 6mm and four variables were computed from the CoP displacements. These results suggest that the lowest TUT could contribute to changing balance control, and may have clinical interest. This brings perspectives in the management of patients with risk of falling or with chronic pain syndromes, complementing validated therapeutic strategies...
September 5, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Farzad Fatehi, Aude-Marie Grapperon, Davood Fathi, Emilien Delmont, Shahram Attarian
The need for a valid biomarker for assessing disease progression and for use in clinical trials on amyotrophic lateral sclerosis (ALS) has stimulated the study of methods that could measure the number of motor units. Motor unit number index (MUNIX) is a newly developed neurophysiological technique that was demonstrated to have a good correlation with the number of motor units in a given muscle, even though it does not necessarily accurately express the actual number of viable motor neurons. Several studies demonstrated the technique is reproducible and capable of following motor neuron loss in patients with ALS and peripheral polyneuropathies...
October 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Prashanth R J Vas, Kalliopi Pafili, Nikolaos Papanas
No abstract text is available yet for this article.
September 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Vasilios K Kimiskidis, Sotirios Papayiannopoulos, Kyriaki Sotirakoglou, Haralambos Karakasis, Zoe Katsarou, Dimitrios A Kazis, Vasileios Papaliagkas, Stylianos Gatzonis, Alexandros Papadimitriou, Georgios Hadjigeorgiou, Sevasti Bostanjopoulou
Mutations in the α-synuclein gene are a rare cause of Parkinson's disease. We investigated, by single-pulse TMS, the cortical excitability profile of nine α-synuclein patients in comparison with 24 idiopathic PD patients, subdivided into "akinetic" (n=17) and "tremor-dominant" (n=7) subgroups. The comparative assessment of rest motor threshold, active MEP and Silent Period Input/Output curves indicated that the cortical excitability of α-Synuclein patients is similar to patients with the "akinetic" form of PD...
September 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Farhad Gholami, Saeed Nikookheslat, Yaghoub Salekzamani, Normand Boule, Afshar Jafari
OBJECTIVE: Peripheral neuropathy (PN) is one of the long-term complications of diabetes. Few studies have investigated the role of regular exercise on diabetic PN. We examined the effect of aerobic training on nerve conduction velocity and action potential amplitude in the lower limbs of men with type 2 diabetes and PN. METHODS: In a randomized controlled study, 24 volunteers diagnosed with diabetic PN were randomly assigned to exercise or control groups. Aerobic training consisted of 20-45min walking or running at 50-70% of heart rate reserve for three sessions per week over 12weeks...
September 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Clémence Lopez, Cherhazad Hemimou, Bernard Golse, Laurence Vaivre-Douret
OBJECTIVES: Children with developmental coordination disorder (DCD) are particularly affected by handwriting disorders, which remain poorly understood and are not clearly defined. The aim of our study is to provide a better understanding of handwriting disorders, and specifically of dysgraphia in children with DCD. METHODS: Sixty-five children with DCD (5-15 years), enrolled according to DSM-5, were assessed with handwriting testing and standardized assessments of neuropsychological, neurovisual, MRI and neuropsychomotor functions, with special attention paid to muscular tone examination...
September 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Valquíria Aparecida da Silva, Ricardo Galhardoni, Manoel Jacobsen Teixeira, Daniel Ciampi de Andrade
INTRODUCTION: Heterotopic conditioned pain modulation (CPM) has provided potentially useful clinical information such as response to medication in neuropathic pain or the prediction of pain after surgical procedures. Despite these advances, several methodological aspects of CPM remain to be determined, such as the impact of the conditioning stimulus (CS) type upon CPM, if its evoked-pain intensity is controlled for [measured on a visual analogue scale (VAS: 0-100mm)]. OBJECTIVES: To explore potential differential effects of CPM using three distinct CS (having similar evoked-pain intensity) in the same individuals...
June 25, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Simon Podnar, Leja Dolenc Grošelj
OBJECTIVE: Both myopathic and neuropathic tongue protruder muscle changes have been demonstrated to occur in obstructive sleep apnea (OSA) patients using different methods. We tried to elucidate this dilemma using quantitative electromyographic (EMG) methods. METHODS: In a group of consecutive patients with suspected OSA a full overnight polysomnography (PSG) and quantitative needle EMG of the tongue protruder, biceps brachii and vastus lateralis muscles were performed...
June 14, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Hasan Hodaj, Jean-François Payen, Jean-Pascal Lefaucheur
OBJECTIVE: To show that repetitive transcranial magnetic stimulation (rTMS) delivered at high frequency over the motor cortex can improve patients with chronic pain syndrome even if this procedure does not provide an analgesic response. CASE REPORT: A 77-year-old woman presented with drug-resistant chronic neuropathic pain affecting both lower limbs due to segmental spine compression at T9-T10 level. She underwent an rTMS protocol with an induction phase of 12 rTMS sessions during three weeks and a maintenance phase of 3 additional rTMS sessions for 5 weeks...
June 14, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Jean-Paul Nguyen, Sylvie Raoul, Hubert Desal, Romain Bourcier, Emmanuelle Kuhn, Véronique Dixneuf, Philippe Damier, Jean-Pascal Lefaucheur, Julien Nizard
This pilot study aimed at assessing the effect of transcutaneous electrical nerve stimulation (TENS) of the occipital nerve (ON) to treat chronic refractory headache secondary to intracranial endovascular procedures (iEVP) in 4 patients. The duration of ON-TENS therapy was only 1 month (n=2) or longer than 4 months (n=2). Overall, pain intensity decreased from 7.8 (on a 0-10 scale) at baseline to 0.8 at 6 months after ON-TENS therapy initiation (-90%), while drug treatment was reduced from 34.3 to 0.8 (-98%) on the medication quantification scale...
June 14, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Nathalie André-Obadia, Julie Zyss, Martine Gavaret, Jean-Pascal Lefaucheur, Eric Azabou, Sébastien Boulogne, Jean-Michel Guérit, Aileen McGonigal, Philippe Merle, Véronique Mutschler, Lionel Naccache, Cécile Sabourdy, Agnès Trébuchon, Louise Tyvaert, Laurent Vercueil, Benjamin Rohaut, Arnaud Delval
Predicting the outcome of a comatose or poorly responsive patient is a major issue for intensive care unit teams, in order to give the most accurate information to the family and to choose the best therapeutic option. However, determining the level of cortical activity in patients with disorders of consciousness is a real challenge. Reliable criteria are required to help clinicians in the decision-making process, especially in the acute phase of coma. In this paper, we propose recommendations for recording and interpreting electroencephalography and evoked potentials in comatose patients based on the literature and the clinical experience of a group of neurophysiologists trained in the management of comatose patients...
June 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Jonathan Monin, Estelle Pruvost-Robieux, Nicolas Huiban, Angela Marchi, Benoit Crepon, Dominique Dubourdieu, Eric Perrier, Martine Gavaret
INTRODUCTION: In France, a systematic EEG is performed during initial examination in military aircrew applicants, which may provide an estimation of the prevalence of benign epileptiform variants in healthy adults. METHODS: We analyzed standard EEG (21 scalp electrodes, 20minutes, 400Hz sampling rate) of military aircrew applicants examined in the French Main Aeromedical Center in 2016. EEGs were analyzed using both bipolar and referential montages. The collected data were EEG abnormalities and benign epileptiform variants...
June 2018: Neurophysiologie Clinique, Clinical Neurophysiology
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