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https://www.readbyqxmd.com/read/28070485/vagus-nerve-stimulation-for-genetic-epilepsy-with-febrile-seizures-plus-gefs-accompanying-seizures-with-impaired-consciousness
#1
Ryosuke Hanaya, Fajar H Niantiarno, Yumi Kashida, Hiroshi Hosoyama, Shinsuke Maruyama, Toshiaki Otsubo, Kazumi Tanaka, Atsushi Ishii, Shinichi Hirose, Kazunori Arita
Genetic epilepsy with febrile seizures plus (GEFS(+)) is characterized by childhood-onset epilepsy syndrome. It involves febrile seizures and a variety of afebrile epileptic seizure types within the same pedigree with autosomal-dominant inheritance. Approximately 10% of individuals with GEFS(+) harbor SCN1A, a gene mutation in one of the voltage-gated sodium channel subunits. Considerably less common are focal epilepsies including complex partial seizures. We report vagus nerve stimulation (VNS) in a 6-year-old girl with GEFS(+) who exhibited refractory generalized tonic-clonic seizures and complex partial seizures...
2017: Epilepsy & Behavior Case Reports
https://www.readbyqxmd.com/read/28017263/effects-of-short-and-prolonged-transcutaneous-vagus-nerve-stimulation-on-heart-rate-variability-in-healthy-subjects
#2
M De Couck, R Cserjesi, R Caers, W P Zijlstra, D Widjaja, N Wolf, O Luminet, J Ellrich, Y Gidron
The vagus nerve is strategically located in the body, and has multiple homeostatic and health-promoting effects. Low vagal activity predicts onset and progression of diseases. These are the reasons to activate this nerve. This study examined the effects of transcutaneous vagus nerve stimulation (t-VNS) on a main index of vagal activity, namely heart rate variability (HRV). In Study 1, we compared short (10min) left versus right ear t-VNS versus sham (no stimulation) in a within-subjects experimental design...
November 30, 2016: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28012885/vagus-nerve-stimulation-removal-or-replacement-involving-the-lead-and-the-electrode-surgical-technique-institutional-experience-and-outcome
#3
Charles Champeaux, Elisabeth Landré, Francine Chassoux, Michael Wilhelm Mann, Bertrand Devaux, Baris Turak
PURPOSE: To analyse the outcome of epileptic patients who had redo surgery involving the vagus nerve stimulation's lead. METHODS: We reviewed the clinical and surgical records of all patients who had a complete VNS removal or replacement or any redo surgical procedure involving the system lead at Sainte-Anne Hospital, Paris. RESULTS: Between the years 1999 and 2016, 41 redo surgical procedures involving the lead / the electrode were achieved, of which 23 complete VNS explantations, 12 complete system replacements, 5 lead changes only and one isolated lead removal...
December 21, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27992003/neuromodulation-in-refractory-epilepsy-brazilian-specialists-consensus
#4
Vera Cristina Terra, Isabella D'Andrea-Meira, Ricardo Amorim, Francisco Arruda, Andrea Julião de Oliveira, Luciano De Paola, Adélia Maria de Miranda Henriques-Souza
Epilepsy is a potentially devastating brain disorder characterized by a predisposition to spontaneous epileptic seizures. In patients with medically refractory epilepsy, new non-pharmacological therapeutic approaches may be considered. In this scenario, palliative surgery such as vagus nerve stimulation (VNS) or deep brain stimulation (DBS) may be indicated in a subset of patients. In this paper we make recommendations for the use of VNS and DBS in patients in Brazil with refractory epilepsy.
December 2016: Arquivos de Neuro-psiquiatria
https://www.readbyqxmd.com/read/27988257/parametric-characterization-of-neural-activity-in-the-locus-coeruleus-in-response-to-vagus-nerve-stimulation
#5
Daniel R Hulsey, Jonathan R Riley, Kristofer W Loerwald, Robert L Rennaker, Michael P Kilgard, Seth A Hays
Vagus nerve stimulation (VNS) has emerged as a therapy to treat a wide range of neurological disorders, including epilepsy, depression, stroke, and tinnitus. Activation of neurons in the locus coeruleus (LC) is believed to mediate many of the effects of VNS in the central nervous system. Despite the importance of the LC, there is a dearth of direct evidence characterizing neural activity in response to VNS. A detailed understanding of the brain activity evoked by VNS across a range of stimulation parameters may guide selection of stimulation regimens for therapeutic use...
December 14, 2016: Experimental Neurology
https://www.readbyqxmd.com/read/27980074/vagus-nerve-stimulation-reduces-cocaine-seeking-and-alters-plasticity-in-the-extinction-network
#6
Jessica E Childs, Jaime DeLeon, Emily Nickel, Sven Kroener
Drugs of abuse cause changes in the prefrontal cortex (PFC) and associated regions that impair inhibitory control over drug-seeking. Breaking the contingencies between drug-associated cues and the delivery of the reward during extinction learning reduces rates of relapse. Here we used vagus nerve stimulation (VNS) to induce targeted synaptic plasticity to facilitate extinction of appetitive behaviors and to reduce relapse. Rats self-administered cocaine and were given VNS during extinction. Relapse to drug-seeking was assessed in a cued reinstatement session...
January 2017: Learning & Memory
https://www.readbyqxmd.com/read/27974314/the-k%C3%A3-lliker-fuse-nuclei-regulate-respiratory-rhythm-variability-via-a-gain-control-mechanism
#7
Rishi R Dhingra, Mathias Dutschmann, Roberto Fernandez Galan, Thomas E Dick
Respiration varies from breath to breath. On the millisecond time scale of spiking, neuronal circuits exhibit variability due to the stochastic properties of ion channels and synapses. Does this fast, microscopic source of variability contribute to the slower, macroscopic variability of the respiratory period? To address this question, we modeled a stochastic oscillator with forcing; then, we tested its predictions experimentally for the respiratory rhythm generated by the in situ perfused preparation during vagal nerve stimulation (VNS)...
December 14, 2016: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/27974275/quality-of-life-metrics-with-vagus-nerve-stimulation-for-epilepsy-from-provider-survey-data
#8
Dario J Englot, Kevin H Hassnain, John D Rolston, Stephen C Harward, Saurabh R Sinha, Michael M Haglund
OBJECTIVE: Drug-resistant epilepsy is a devastating disorder associated with diminished quality of life (QOL). Surgical resection leads to seizure freedom and improved QOL in many epilepsy patients, but not all individuals are candidates for resection. In these cases, neuromodulation-based therapies such as vagus nerve stimulation (VNS) are often used, but most VNS studies focus exclusively on reduction of seizure frequency. QOL changes and predictors with VNS remain poorly understood...
December 11, 2016: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/27973753/vagal-nerve-stimulation-modifies-neuronal-activity-and-the-proteome-of-excitatory-synapses-of-amygdala-piriform-cortex
#9
Georgia M Alexander, Yang Zhong Huang, Erik J Soderblom, Xiao-Ping He, Arthur M Moseley, James O McNamara
Vagal Nerve Stimulation (VNS) Therapy(®) is a United States Food and Drug Administration (FDA) approved neurotherapeutic for medically refractory partial epilepsy and treatment-resistant depression. The molecular mechanisms underlying its beneficial effects are unclear. We hypothesized that one mechanism involves neuronal activity-dependent modifications of central nervous system excitatory synapses. To begin to test this hypothesis, we asked whether VNS modifies the activity of neurons in amygdala and hippocampus...
December 14, 2016: Journal of Neurochemistry
https://www.readbyqxmd.com/read/27957782/transcutaneous-cervical-vagal-nerve-stimulation-modulates-cardiac-vagal-tone-and-tumor-necrosis-factor-alpha
#10
C Brock, B Brock, Q Aziz, H J Møller, M Pfeiffer Jensen, A M Drewes, A D Farmer
The vagus nerve is a central component of cholinergic anti-inflammatory pathways. We sought to evaluate the effect of bilateral transcutaneous cervical vagal nerve stimulation (t-VNS) on validated parameters of autonomic tone and cytokines in 20 healthy subjects. 24 hours after t-VNS, there was an increase in cardiac vagal tone and a reduction in tumor necrosis factor-α in comparison to baseline. No change was seen in blood pressure, cardiac sympathetic index or other cytokines. These preliminary data suggest that t-VNS exerts an autonomic and a subtle antitumor necrosis factor-α effect, which warrants further evaluation in larger controlled studies...
December 12, 2016: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/27957346/vagus-nerve-stimulation-enhances-extinction-of-conditioned-fear-in-rats-and-modulates-arc-protein-camkii-and-glun2b-containing-nmda-receptors-in-the-basolateral-amygdala
#11
Amanda C Alvarez-Dieppa, Kimberly Griffin, Sheridan Cavalier, Christa K McIntyre
Vagus nerve stimulation (VNS) enhances the consolidation of extinction of conditioned fear. High frequency stimulation of the infralimbic cortex (IL) produces long-term potentiation in the basolateral amygdala (BLA) in rats given VNS-paired extinction training, whereas the same stimulation produces long-term depression in sham-treated rats. The present study investigated the state of synaptic plasticity-associated proteins in the BLA that could be responsible for this shift. Male Sprague-Dawley rats were separated into 4 groups: auditory fear conditioning only (fear-conditioned); fear conditioning + 20 extinction trials (extended-extinction); fear conditioning + 4 extinction trials paired with sham stimulation (sham-extinction); fear conditioning + 4 extinction trials paired with VNS (VNS-extinction)...
2016: Neural Plasticity
https://www.readbyqxmd.com/read/27931947/transection-of-the-omohyoid-muscle-as-an-aid-during-vagal-nerve-stimulator-implantation
#12
June Yowtak, Patrick Jenkins, Cole Giller
BACKGROUND: Exposure of the carotid sheath during VNS implantation is usually straightforward, but can be difficult for patients with a large body habitus. In addition, the exposure must be done with care if the surgeon wishes to keep the vagus nerve in situ without using retractors that might impair access. OBJECTIVE: To describe the use of the omohyoid muscle as a landmark for the jugular vein, and to report how transection of the omohyoid can facilitate a rapid and wide exposure of the carotid sheath...
December 5, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27919011/cardiovascular-autonomic-and-hemodynamic-responses-to-vagus-nerve-stimulation-in-drug-resistant-epilepsy
#13
Iñigo Garamendi, Marian Acera, Marta Agundez, Lara Galbarriatu, Ainhoa Marinas, Iñigo Pomposo, Elena Valle, Jose-Alberto Palma, Juan C Gomez-Esteban
PURPOSE: Vagus nerve stimulation (VNS) is used as an adjunctive therapy for treating patients with drug-resistant epilepsy. The impact of VNS on cardiovascular autonomic function remains to be fully understood. We determined changes in cardiovascular sympathetic and parasympathetic, and hemodynamic function in association with VNS in patients with drug-resistant focal epilepsy. METHOD: Longitudinal (n=15) evaluation of beat-to-beat blood pressure (BP) and heart rate variability (HRV), baroreflex sensibility, and hemodynamic function performed before VNS implantation, 6-months after implantation, and a mean of 12-months after implantation; and cross-sectional study (n=14) of BP and HR variability and baroreflex sensitivity during VNS on and VNS off...
December 2, 2016: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/27900597/l-pgds-mediates-vagus-nerve-stimulation-induced-neuroprotection-in-a-rat-model-of-ischemic-stroke-by-suppressing-the-apoptotic-response
#14
Lina Zhang, Jingxi Ma, Xinhao Jin, Gongwei Jia, Ying Jiang, Changqing Li
The role of lipocalin prostaglandin D2 synthase (L-PGDS) in brain ischemia has not been fully clarified to date. Vagus nerve stimulation (VNS) protects against cerebral ischemia/reperfusion (I/R) injury, but the mechanisms involved need further exploration. This study investigated the role of L-PGDS in cerebral I/R and whether this process was involved in the mechanism of VNS-mediated neuroprotection. Male Sprague-Dawley rats were pretreated with a lentiviral vector (LV) through intracerebroventricular injection, followed by middle cerebral artery occlusion (MCAO) and VNS treatment...
November 29, 2016: Neurochemical Research
https://www.readbyqxmd.com/read/27898202/optimization-of-transcutaneous-vagus-nerve-stimulation-using-functional-mri
#15
Natalia Yakunina, Sam Soo Kim, Eui-Cheol Nam
OBJECTIVE/HYPOTHESIS: Vagus nerve stimulation (VNS) is an established therapy for drug-resistant epilepsy, depression, and a number of other disorders. Transcutaneous stimulation of the auricular branch of the vagus nerve (tVNS) has been considered as a non-invasive alternative. Several functional magnetic resonance imaging (fMRI) studies on the effects of tVNS used different stimulation parameters and locations in the ear, which makes it difficult to determine the optimal tVNS methodology...
November 29, 2016: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/27878616/effectiveness-of-vagal-nerve-stimulation-in-medication-resistant-epilepsy-comparison-between-patients-with-and-without-medication-changes
#16
María A García-Pallero, Eduardo García-Navarrete, Cristina V Torres, Jesús Pastor, Marta Navas, R G Sola
BACKGROUND: Vagal nerve stimulation (VNS) response is not immediate. A progressive decline in seizure frequency is usually found during a period of 12-18 months after implantation. During this time, the patient's medication is usually modified, which can create doubts about whether their clinical improvement is due to medication changes or to VNS itself. Our goal is to compare two groups of patients treated with VNS, with and without changes in their medication. METHODS: We prospectively analyze 85 patients who were treated with VNS in our hospital between 2005 and 2014...
January 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/27876240/variable-neighborhood-search-to-solve-the-vehicle-routing-problem-for-hazardous-materials-transportation
#17
Gustavo Alfredo Bula, Caroline Prodhon, Fabio Augusto Gonzalez, H Murat Afsar, Nubia Velasco
This work focuses on the Heterogeneous Fleet Vehicle Routing problem (HFVRP) in the context of hazardous materials (HazMat) transportation. The objective is to determine a set of routes that minimizes the total expected routing risk. This is a nonlinear function, and it depends on the vehicle load and the population exposed when an incident occurs. Thus, a piecewise linear approximation is used to estimate it. For solving the problem, a variant of the Variable Neighborhood Search (VNS) algorithm is employed...
February 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27863972/vagus-nerve-stimulator-related-speech-exercise-induced-cough
#18
Charlotte Dandurand, Pierre-Olivier Champagne, Karim Elayoubi, Alexander G Weil, Paul Lespérence, Alain Bouthillier
Vagal nerve stimulation (VNS) therapy is an effective adjunctive treatment for chronic or recurrent treatment resistant depression. Although considered a safe procedure, increasing output current can be associated with stimulation induced side effects. We report the first case of dry cough induced by speech and mild exercise, occurring in the off mode following implantation of a vagal nerve stimulator (VNSor). We discuss the possible pathophysiology and the potential treatment options of this rare complication...
November 15, 2016: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/27848034/vagus-nerve-stimulation-in-psychiatry-a-systematic-review-of-the-available-evidence
#19
REVIEW
Camelia-Lucia Cimpianu, Wolfgang Strube, Peter Falkai, Ulrich Palm, Alkomiet Hasan
Invasive and non-invasive vagus nerve stimulation (VNS) is a promising add-on treatment for treatment-refractory depression, but is also increasingly evaluated for its application in other psychiatric disorders, such as dementia, schizophrenia, somatoform disorder, and others. We performed a systematic review aiming to give a detailed overview of the available evidence of the efficacy of VNS for the treatment of psychiatric disorders. Data derived from animal models, experimental trials without health-related outcomes, case reports, single-session studies, and reviews were excluded...
November 16, 2016: Journal of Neural Transmission
https://www.readbyqxmd.com/read/27846228/a-new-soft-computing-method-for-k-harmonic-means-clustering
#20
Wei-Chang Yeh, Yunzhi Jiang, Yee-Fen Chen, Zhe Chen
The K-harmonic means clustering algorithm (KHM) is a new clustering method used to group data such that the sum of the harmonic averages of the distances between each entity and all cluster centroids is minimized. Because it is less sensitive to initialization than K-means (KM), many researchers have recently been attracted to studying KHM. In this study, the proposed iSSO-KHM is based on an improved simplified swarm optimization (iSSO) and integrates a variable neighborhood search (VNS) for KHM clustering...
2016: PloS One
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