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Vagal nerve stimulator

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https://www.readbyqxmd.com/read/27898202/optimization-of-transcutaneous-vagus-nerve-stimulation-using-functional-mri
#1
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
#2
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...
November 23, 2016: Acta Neurochirurgica
https://www.readbyqxmd.com/read/27873376/extended-long-term-effects-of-cervical-vagal-nerve-stimulation-on-headache-intensity-frequency-and-affective-cognitive-headache-perception-in-drug-resistant-complex-partial-seizure-patients
#3
Bogdan Pintea, Kevin Hampel, Jan Boström, Rainer Surges, Hartmut Vatter, Ilana S Lendvai, Thomas M Kinfe
OBJECTIVES: Invasive vagal nerve stimulation (iVNS) is an established treatment option for drug-resistant focal seizures and has been assumed to diminish frequent co-incidental daily headache/migraine. However, long-term effects on cognitive/affective head pain perception, headache intensity/frequency are lacking. We therefore investigated potential iVNS-induced effects in patients with drug-resistant focal seizure and daily headache/migraine. MATERIALS AND METHODS: A clinical database was used to select 325 patients with drug-resistant epilepsy treated by either iVNS plus best medical treatment (BMT) or BMT alone, compared to a healthy control group (HC)...
November 22, 2016: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/27863972/vagus-nerve-stimulator-related-speech-exercise-induced-cough
#4
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/27852563/effects-of-electroacupuncture-at-st25-and-bl25-in-a-sennae-induced-rat-model-of-diarrhoea-predominant-irritable-bowel-syndrome
#5
Xianwei Zhu, Zhibin Liu, Wenmin Niu, Yuan Wang, Aimin Zhang, Hongyan Qu, Jing Zhou, Lu Bai, Yong Yang, Jie Li
BACKGROUND: Electroacupuncture (EA) may have a role in the treatment of diarrhoea symptoms. Serotonin (5-hydroxytryptamine, 5-HT) is an important neurotransmitter and paracrine signalling molecule in the gastrointestinal (GI) tract, which initiates peristaltic, secretory, vasodilatory, vagal and nociceptive reflexes. In addition, according to the results of our previous report, EA stimulation mediates GI peristalsis by increasing expression of 5-HT and tryptophan hydroxylase (TPH). AIM: To investigate the effect of EA at acupuncture points ST25 and BL25 in a rat model of diarrhoea...
November 15, 2016: Acupuncture in Medicine: Journal of the British Medical Acupuncture Society
https://www.readbyqxmd.com/read/27852001/reduced-epicardial-vagal-nerve-density-and-impaired-vagal-control-in-a-rat-myocardial-infarction-heart-failure-model
#6
Matthew S Delfiner, John Siano, Ying Li, Eduard I Dedkov, Youhua Zhang
BACKGROUND: Autonomic remodeling, characterized by sympathetic activation and vagal withdrawal, contributes to heart failure (HF) progression. However, the exact mechanism(s) responsible for vagal withdrawal in HF remain(s) unclear, and whether HF causes epicardial autonomic nerve remodeling is unknown. METHODS AND RESULTS: Myocardial infarction (MI) was produced in 14 Sprague-Dawley rats, and 10 sham surgery rats served as the control. MI-HF was confirmed 2 months after the surgery by echocardiography and hemodynamic measurement...
October 23, 2016: Cardiovascular Pathology: the Official Journal of the Society for Cardiovascular Pathology
https://www.readbyqxmd.com/read/27844147/acute-ivabradine-treatment-reduces-heart-rate-without-increasing-atrial-fibrillation-inducibility-irrespective-of-underlying-vagal-activity-in-dogs
#7
Kazunori Uemura, Masashi Inagaki, Can Zheng, Toru Kawada, Meihua Li, Masafumi Fukumitsu, Masaru Sugimachi
Ivabradine, a bradycardic agent, has been shown to stably reduce patient's heart rate (HR) in the setting of acute cardiac care. However, an association between atrial fibrillation (AF) risk and acute ivabradine treatment remains a controversial clinical issue, and has not been thoroughly investigated. Bradycardia and abnormal atrial refractoriness induced by ivabradine treatment may enhance vulnerability to AF induction, especially when vagal nerve is concurrently activated. We aimed to experimentally investigate the effects of acute ivabradine treatment with/without concurrent vagal activation on AF inducibility...
November 14, 2016: Heart and Vessels
https://www.readbyqxmd.com/read/27816306/intravenous-electrical-vagal-nerve-stimulation-prior-to-coronary-reperfusion-in-a-canine-ischemia-reperfusion-model-markedly-reduces-infarct-size-and-prevents-subsequent-heart-failure
#8
Takahiro Arimura, Keita Saku, Takamori Kakino, Takuya Nishikawa, Takeshi Tohyama, Takafumi Sakamoto, Kazuo Sakamoto, Takuya Kishi, Tomomi Ide, Kenji Sunagawa
BACKGROUND: Reducing myocardial damage is a prerequisite to prevent chronic heart failure after acute myocardial infarction (AMI). Although vagal nerve stimulation (VNS) has been repeatedly demonstrated to have potent anti-infarct effect, technical difficulties have precluded its clinical application. We developed a novel therapeutic strategy of intravenous VNS (iVNS) and examined whether iVNS administered prior to coronary reperfusion in a canine AMI model reduces infarct size and prevents heart failure...
October 29, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27779300/-results-of-vagal-nerve-stimulation-in-patients-with-pharmacoresistant-epilepsy-in-a-national-epilepsy-referral-centre
#9
P Roldan-Ramos, L A Reyes-Figueroa, J Rumia, E Martinez-Lizana, A Donaire, M Carreno-Martinez
AIM: To describe clinical results and complications derived from vagal nerve stimulation therapy in drug resistant epileptic patients unsuitable for other surgical treatments, since the first implant in an epilepsy national referral centre. PATIENTS AND METHODS: A retrospective analysis of the patients implanted in our centre was held. Data related to baseline characteristics of their epilepsy and therapy complications was collected. RESULTS: 32 new implants in 31 patients are included, mean age of 34 years, 29...
November 1, 2016: Revista de Neurologia
https://www.readbyqxmd.com/read/27776979/chronic-kidney-disease-impairs-renal-nerve-and-haemodynamic-reflex-responses-to-vagal-afferent-input-through-a-central-mechanism
#10
REVIEW
Ibrahim M Salman, Cara M Hildreth, Jacqueline K Phillips
We investigated age- and sex-related changes in reflex renal sympathetic nerve activity (RSNA) and haemodynamic responses to vagal afferent stimulation in a rodent model of chronic kidney disease (CKD). Using anaesthetised juvenile (7-8weeks) and adult (12-13weeks) Lewis Polycystic Kidney (LPK) and Lewis control rats of either sex (n=63 total), reflex changes in RSNA, heart rate (HR) and mean arterial pressure (MAP) to vagal afferent stimulation (5-s train, 4.0V, 2.0-ms pulses, 1-16Hz) were measured. In all groups, stimulation of the vagal afferents below 16Hz produced frequency-dependent reductions in RSNA, HR and MAP, while a 16Hz stimulus produced an initial sympathoinhibition followed by sympathoexcitation...
October 11, 2016: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/27707722/vagal-afferent-activation-induces-salivation-and-swallowing-like-events-in-anesthetized-rats
#11
Hirotaka Ueda, Mayu Suga, Takakazu Yagi, Ikue Kusumoto-Yoshida, Hideki Kashiwadani, Tomoyuki Kuwaki, Shouichi Miyawaki
The aim of this study was to clarify the effect of vagal afferent activation on salivation and swallowing-like events. Salivation is part of a reflex induced by stimulation of the oral area during feeding or chewing. Recently, we reported that nausea induced by gastro-esophageal reflux (GER) activation produced salivation and swallowing in humans. Here, we investigated the ability of visceral sensation to enhance salivation and swallowing in rodents in order to inform the mechanism of GER-mediated stomatognathic activation...
October 5, 2016: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/27693445/reversal-of-cardiac-vagal-effects-of-physostigmine-by-adjunctive-muscarinic-blockade
#12
James Winter, Alexandra R Cook, Dawn H Patient, Stevan R Emmett, John Tattersall, Michael J Shattock
Pre-treatment with reversible acetylcholinesterase (AChE) inhibitors is an effective strategy for reducing lethality following organophosphate nerve agent exposure. AChE inhibition may have unwanted cardiac side effects, which could be negated by adjunctive anti-cholinergic therapy. The aims of the present study were to examine the concentration-dependent effects of physostigmine on cardiac responses to vagus nerve stimulation (VNS), to test whether adjunctive treatment with hyoscine can reverse these effects and to assess the functional interaction and electrophysiological consequences of a combined pre-treatment...
September 28, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27676327/chronic-sarpogrelate-treatment-reveals-5-ht7-receptor-in-the-serotonergic-inhibition-of-the-rat-vagal-bradycardia
#13
José Ángel García-Pedraza, Mónica García, María Luisa Martín, Nélida Eleno, Asunción Morán
5-hydroxytryptamine (5-HT) modulates the cardiac parasympathetic neurotransmission, inhibiting the bradyarrhythmia by 5-HT2 receptor activation. We aimed to determine whether the chronic selective 5-HT2 blockade (sarpogrelate) could modify the serotonergic modulation on vagal cardiac outflow in pithed rat. Bradycardic responses in rats treated with sarpogrelate (30 mg/kg.day; p.o.) were obtained by electrical stimulation of the vagal fibers (3, 6, and 9 Hz) or i.v. injections of acetylcholine (ACh; 1, 5, and 10 μg/kg)...
September 20, 2016: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/27629885/nonlinear-identification-of-the-total-baroreflex-arc-higher-order-nonlinearity
#14
Mohsen Moslehpour, Toru Kawada, Kenji Sunagawa, Masaru Sugimachi, Ramakrishna Mukkamala
The total baroreflex arc is the open-loop system relating carotid sinus pressure (CSP) to arterial pressure (AP). The nonlinear dynamics of this system were recently characterized. First, Gaussian white noise CSP stimulation was employed in open-loop conditions in normotensive and hypertensive rats with sectioned vagal and aortic depressor nerves. Nonparametric system identification was then applied to measured CSP and AP to establish a second-order nonlinear Uryson model. The aim in this study was to assess the importance of higher-order nonlinear dynamics via development and evaluation of a third-order nonlinear model of the total arc using the same experimental data...
December 1, 2016: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/27591222/vagal-stimulation-targets-select-populations-of-intrinsic-cardiac-neurons-to-control-neurally-induced-atrial-fibrillation
#15
Siamak Salavatian, Eric Beaumont, Jean-Philippe Longpré, J Andrew Armour, Alain Vinet, Vincent Jacquemet, Kalyanam Shivkumar, Jeffrey L Ardell
Mediastinal nerve stimulation (MNS) reproducibly evokes atrial fibrillation (AF) by excessive and heterogeneous activation of intrinsic cardiac (IC) neurons. This study evaluated whether preemptive vagus nerve stimulation (VNS) impacts MNS-induced evoked changes in IC neural network activity to thereby alter susceptibility to AF. IC neuronal activity in the right atrial ganglionated plexus was directly recorded in anesthetized canines (n = 8) using a linear microelectrode array concomitant with right atrial electrical activity in response to: 1) epicardial touch or great vessel occlusion vs...
November 1, 2016: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/27542331/neuro-immune-interactions-in-the-cholinergic-anti-inflammatory-reflex
#16
REVIEW
Colin Reardon
Communication between the nervous and immune systems can significantly alter immune cell function in a number of inflammatory diseases. Elegant studies have defined a basic functional circuit in a "cholinergic anti-inflammatory pathway" that highlights a unique role for the vagus nerve, and has brought about a resurgence in the field of neuro-immunology. This research has further identified that in addition to tonic signals that can restrain immune cell activation; the anti-inflammatory reflex arc is amiable to targeted stimulation as a therapeutic modality...
October 2016: Immunology Letters
https://www.readbyqxmd.com/read/27516384/comparing-neurostimulation-technologies-in-refractory-focal-onset-epilepsy
#17
Inuka Kishara Gooneratne, Alexander L Green, Patricia Dugan, Arjune Sen, Angelo Franzini, Tipu Aziz, Binith Cheeran
For patients with pharmacoresistant focal epilepsy in whom surgical resection of the epileptogenic focus fails or was not feasible in the first place, there were few therapeutic options. Increasingly, neurostimulation provides an alternative treatment strategy for these patients. Vagal nerve stimulation (VNS) is well established. Deep brain stimulation (DBS) and cortical responsive stimulation (CRS) are newer neurostimulation therapies with recently published long-term efficacy and safety data. In this literature review, we introduce these therapies to a non-specialist audience...
November 2016: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/27497814/how-does-vagal-nerve-stimulation-vns-change-eeg-brain-functional-connectivity
#18
Fabrice Bartolomei, Francesca Bonini, Elsa Vidal, Agnes Trébuchon, Stanislas Lagarde, Isabelle Lambert, Aileen McGonigal, Didier Scavarda, Romain Carron, Christian G Benar
An effect of vagal nerve stimulation (VNS) on cortical synchronization has been postulated but remains to be verified. In this study we investigated the impact of VNS on functional connectivity (Fc) using direct intracerebral recordings (stereotactic EEG, SEEG). Five patients with epilepsy who underwent SEEG recordings during ongoing VNS therapy were investigated. Interdependencies between twenty-six selected bipolar SEEG channels were estimated by nonlinear regression analysis during ON and OF periods of stimulation...
October 2016: Epilepsy Research
https://www.readbyqxmd.com/read/27491814/vagal-nerve-stimulation-improves-mitochondrial-dynamics-via-an-m3-receptor-camkk%C3%AE-ampk-pathway-in-isoproterenol-induced-myocardial-ischaemia
#19
Run-Qing Xue, Lei Sun, Xiao-Jiang Yu, Dong-Ling Li, Wei-Jin Zang
Mitochondrial dynamics-fission and fusion-are associated with ischaemic heart disease (IHD). This study explored the protective effect of vagal nerve stimulation (VNS) against isoproterenol (ISO)-induced myocardial ischaemia in a rat model and tested whether VNS plays a role in preventing disorders of mitochondrial dynamics and function. Isoproterenol not only caused cardiac injury but also increased the expression of mitochondrial fission proteins [dynamin-related peptide1 (Drp1) and mitochondrial fission protein1 (Fis-1)) and decreased the expression of fusion proteins (optic atrophy-1 (OPA1) and mitofusins1/2 (Mfn1/2)], thereby disrupting mitochondrial dynamics and leading to increase in mitochondrial fragments...
August 5, 2016: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/27473930/brainstem-mediated-sniffing-and-respiratory-modulation-during-odor-stimulation
#20
Fernando Pérez de Los Cobos Pallares, Tara G Bautista, Davor Stanić, Veronica Egger, Mathias Dutschmann
The trigeminal and olfactory systems interact during sensory processing of odor. Here, we investigate odor-evoked modulations of brainstem respiratory networks in a decerebrated perfused brainstem preparation of rat with intact olfactory bulbs. Intranasal application of non-trigeminal odors (rose) did not evoke respiratory modulation in absence of cortico-limbic circuits. Conversely, trigeminal odors such as menthol or lavender evoked robust respiratory modulations via direct activation of preserved brainstem circuits...
November 2016: Respiratory Physiology & Neurobiology
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