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Electrical stimulators

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https://www.readbyqxmd.com/read/29351666/intraoperative-identification-and-preservation-of-verbal-memory-in-diffuse-gliomas-a-matched-pair-cohort-study
#1
Juan Martino, Elsa Gomez, Enrique Marco de Lucas, David Mato, Javier Vázquez-Bourgon
BACKGROUND: Recent glioma surgery series with intraoperative electrical stimulation (IES) language mapping have demonstrated high rates of postoperative memory impairment, raising a question regarding the efficacy of this approach to preserve memory. OBJECTIVE: To evaluate if intraoperative identification and preservation of verbal memory sites with IES mapping in diffuse gliomas in eloquent areas consistently protect patients from long-term postoperative decline in short-term memory...
January 17, 2018: Neurosurgery
https://www.readbyqxmd.com/read/29351358/microfluidics-based-subretinal-chemical-neuromodulation-of-photoreceptor-degenerated-retinas
#2
Corey M Rountree, John B Troy, Laxman Saggere
Purpose: Retinal prostheses can restore rudimentary vision in cases of photoreceptor degeneration through electrical stimulation, but face difficulties achieving high spatial resolution because electrical current is an inherently unnatural stimulus. We investigated the therapeutic feasibility of using patterned delivery of the glutamate neurotransmitter, a primary agent of natural synaptic communication of the retina, as a biomimetic chemical alternative to electrical current for neuromodulation of photoreceptor degenerate retina...
January 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29351276/static-length-changes-of-cochlear-outer-hair-cells-can-tune-low-frequency-hearing
#3
Nikola Ciganović, Rebecca L Warren, Batu Keçeli, Stefan Jacob, Anders Fridberger, Tobias Reichenbach
The cochlea not only transduces sound-induced vibration into neural spikes, it also amplifies weak sound to boost its detection. Actuators of this active process are sensory outer hair cells in the organ of Corti, whereas the inner hair cells transduce the resulting motion into electric signals that propagate via the auditory nerve to the brain. However, how the outer hair cells modulate the stimulus to the inner hair cells remains unclear. Here, we combine theoretical modeling and experimental measurements near the cochlear apex to study the way in which length changes of the outer hair cells deform the organ of Corti...
January 19, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29350303/a-short-review-of-the-non-invasive-transcutaneous-pericranial-electrical-stimulation-techniques-and-their-application-in-headache
#4
REVIEW
Licia Grazzi, Emanuela Sansone, Paul Rizzoli
PURPOSE OF REVIEW: In this short review, the most common non-invasive neuromodulatory techniques will be described, along with their advantages and disadvantages and their application in headache. Available preventive treatments can be unhelpful or may have unpleasant side effects; moreover, the rate of response to preventive drugs does not exceed 50%, lower in chronic migraine; alternative options would be welcome. Though the concept of neuromodulation was originally developed with invasive methods, newer non-invasive techniques are appearing...
January 19, 2018: Current Pain and Headache Reports
https://www.readbyqxmd.com/read/29350199/cortical-visual-prostheses-from-microstimulation-to-functional-percept
#5
Armin Najarpour Foroushani, Christopher Pack, Mohamad Sawan
Cortical visual prostheses are intended to restore vision by targeted electrical stimulation of the visual cortex. The perception of spots of light, called phosphenes, resulting from microstimulation of the visual pathway, suggests the possibility of creating meaningful percept made of phosphenes. However, to date electrical stimulation of V1 has still not resulted in perception of phosphenated images that goes beyond punctate spots of light. In this review, we summarize the clinical and experimental progress that has been made in generating phosphenes and modulating their associated perceptual characteristics in human and macaque primary visual cortex (V1)...
January 19, 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29350183/integrated-biocircuits-engineering-functional-multicellular-circuits-and-devices
#6
Jordan Prox, Tory Smith, Chad Holl, Nick Chehade, Liang Guo
Novel in vitro platforms are currently revolutionizing the study and reconstruction of cellular circuitry to bypass the pertaining obstacles of data retrieval in vivo. While earlier approaches have provided great insights into culturing circuits in planar dissociated cell culture systems, the lack of full control over network activity and formation limits our understanding of their functionality. Thus, integrating various controllable parameters are required in creating a suitable microenvironment including cell patterning, highly-specified electrical and chemical stimuli, and rational circuit formation via logic functions...
January 19, 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29349480/posture-modulates-the-sensitivity-of-the-h-reflex
#7
Serpil Cecen, Imran Khan Niazi, Rasmus Wiberg Nedergaard, Alice Cade, Kathryn Allen, Kelly Holt, Heidi Haavik, Kemal S Türker
The effect of body posture on the human soleus H-reflex via electrical stimulation of the tibial nerve at the popliteal fossa was studied. All parameters that may influence the reflex were controlled stringently. H-reflexes were elicited in three different body postures while keeping the level of background muscle activation to a minimum. The H-reflex curve relative to the M-wave curve did not change significantly in any of the body postures. However, the maximal H-reflex amplitude significantly increased in the prone position compared with the sitting (p = 0...
January 18, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29348619/cytokine-mediated-changes-in-k-channel-activity-promotes-an-adaptive-ca2-response-that-sustains-%C3%AE-cell-insulin-secretion-during-inflammation
#8
Matthew T Dickerson, Avery M Bogart, Molly K Altman, Sarah C Milian, Kelli L Jordan, Prasanna K Dadi, David A Jacobson
Cytokines present during low-grade inflammation contribute to β-cell dysfunction and diabetes. Cytokine signaling disrupts β-cell glucose-stimulated Ca2+ influx (GSCI) and endoplasmic reticulum (ER) Ca2+ ([Ca2+]ER) handling, leading to diminished glucose-stimulated insulin secretion (GSIS). However, cytokine-mediated changes in ion channel activity that alter β-cell Ca2+ handling remain unknown. Here we investigated the role of K+ currents in cytokine-mediated β-cell dysfunction. Kslow currents, which control the termination of intracellular Ca2+ ([Ca2+]i) oscillations, were reduced following cytokine exposure...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29346227/refractory-pain-management-in-amyloid-associated-peripheral-neuropathy
#9
Nafisseh S Warner, James C Watson, Markus A Bendel, Susan M Moeschler
OBJECTIVE: Systemic amyloidosis is a disease that often involves multiple organ systems, including the peripheral nervous system. Patients may present with severe, refractory neuropathic pain; however, the optimal treatment approach for pain for these patients remains unclear. CASE REPORT: A man with severe, refractory neuropathic pain in his bilateral upper and lower extremities and the trunk secondary to amyloid neuropathy is presented. Multiple medication trials, including neuropathic and opioid agents, produced considerable adverse effects and minimal relief...
January 17, 2018: Regional Anesthesia and Pain Medicine
https://www.readbyqxmd.com/read/29346088/intense-olfactory-stimulation-blocks-seizures-in-an-experimental-model-of-epilepsy
#10
Polianna Delfino-Pereira, Poliana Bertti-Dutra, Eduardo Henrique de Lima Umeoka, José Antônio Cortes de Oliveira, Victor Rodrigues Santos, Artur Fernandes, Simone Saldanha Marroni, Flávio Del Vecchio, Norberto Garcia-Cairasco
There are reports of patients whose epileptic seizures are prevented by means of olfactory stimulation. Similar findings were described in animal models of epilepsy, such as the electrical kindling of amygdala, where olfactory stimulation with toluene (TOL) suppressed seizures in most rats, even when the stimuli were 20% above the threshold to evoke seizures in already kindled animals. The Wistar Audiogenic Rat (WAR) strain is a model of tonic-clonic seizures induced by acute acoustic stimulation, although it also expresses limbic seizures when repeated acoustic stimulation occurs - a process known as audiogenic kindling (AK)...
January 12, 2018: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29345555/the-preparation-period-in-basketball-training-load-and-neuromuscular-adaptations
#11
Davide Ferioli, Andrea Bosio, Johann C Bilsborough, Antonio La Torre, Michele Tornaghi, Ermanno Rampinini
PURPOSE: To investigate the 1) effect of the preparation period on the neuromuscular characteristics of 12 professional (PRO) and 16 semi-professional (SEMI-PRO) basketball players; 2) relationships between training load indices and changes in neuromuscular physical performance. METHODS: Prior to and following the preparation period, players underwent a counter-movement jump (CMJ) test, followed by a repeated change of direction (COD) test consisting of 4 levels with increasing intensities...
January 18, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29344780/intraoperative-monitoring-of-z-l-response-zlr-and-abnormal-muscle-response-amr-during-microvascular-decompression-for-hemifacial-spasm-interpreting-the-role-of-zlr
#12
Byung-Chul Son, Hak-Cheol Ko, Jin-Gyu Choi
BACKGROUND: Z-L response (ZLR) has been suggested to a new electromyographic (EMG) potential recorded from the facial muscle of patient with hemifacial spasm (HFS) during microvascular decompression (MVD). Although ZLR has been suggested to be useful, experience of ZLR monitoring is limited and its significance during MVD is still unclear. METHODS: To investigate the significance of ZLR, both ZLR and abnormal muscle response (AMR) were simultaneously recorded before and after decompression of root exit zone (REZ) in 20 consecutive patients with HFS...
January 17, 2018: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29343983/does-transcutaneous-electrical-nerve-stimulation-reduce-pain-and-improve-quality-of-life-in-patients-with-idiopathic-chronic-orchialgia-a-randomized-controlled-trial
#13
Sayed A Tantawy, Dalia M Kamel, Walid Kamal Abdelbasset
Background: Chronic orchialgia is defined as testicular pain, which may be either unilateral or bilateral, lasting for more than 3 months. It disturbs a patient's daily activities and quality of life (QoL), inciting the patient to search for treatments to alleviate the pain. It is estimated that 25% of chronic orchialgia cases are idiopathic. Purpose: The purpose of this study was to investigate how effective transcutaneous electrical nerve stimulation (TENS) is in pain reduction and how it consequently affects the QoL in patients with idiopathic chronic orchialgia (ICO)...
2018: Journal of Pain Research
https://www.readbyqxmd.com/read/29343862/angiotensin-ii-overstimulation-leads-to-an-increased-susceptibility-to-dilated-cardiomyopathy-and-higher-mortality-in-female-mice
#14
Sophie Mathieu, Nabil El Khoury, Katy Rivard, Pierre Paradis, Mona Nemer, Céline Fiset
Heart failure (HF) is associated with high mortality and affects men and women differently. The underlying mechanisms for these sex-related differences remain largely unexplored. Accordingly, using mice with cardiac-specific overexpression of the angiotensin II (ANGII) type 1 receptor (AT1R), we explored male-female differences in the manifestations of hypertrophy and HF. AT1R mice of both sexes feature electrical and Ca2+ handling alterations, systolic dysfunction, hypertrophy and develop HF. However, females had much higher mortality (21...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343857/stimulation-of-epicardial-sympathetic-nerves-at-different-sites-induces-cardiac-electrical-instability-to-various-degrees
#15
Liang Wang, Lin Sun, Kun Wang, Yingying Jin, Qing Liu, Zhongnan Xia, Xudong Liu, Jiakun Zhang, Jingjie Li
The cardiac sympathetic nerves distribute across cardiac tissues with uneven density. Yet, to what extent this anatomical heterogeneity affects electrical activity of the left ventricle is largely unknown. Dogs were randomized into non-stimulation control (NC), posterior basal-stimulation (PB), anterior superior-stimulation (AS), apical part-stimulation (AP) group. The epicardial sympathetic nerves at different sites along their distribution were with electrical stimulation (ES) for 4 hours except in the NC group...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343055/genetically-encoded-circuit-for-remote-regulation-of-cell-migration-by-magnetic-fields
#16
Abdullah Al Mosabbir, Kevin Truong
Magneto-reception can be generally defined as the ability to transduce the effects of a magnetic field into a cellular response. Magnetic stimulation at the cellular level is particularly attractive due to its ability for deep penetration and minimal invasiveness, allowing remote regulation of engineered biological processes. Previously, a magnetic-responsive genetic circuit was engineered using the transient receptor potential vanilloid 1 (TRPV1) and the iron containing ferritin protein (i.e. the TF circuit)...
January 17, 2018: ACS Synthetic Biology
https://www.readbyqxmd.com/read/29342237/the-roles-of-subdivisions-of-human-insula-in-emotion-perception-and-auditory-processing
#17
Yang Zhang, Wenjing Zhou, Siyu Wang, Qin Zhou, Haixiang Wang, Bingqing Zhang, Juan Huang, Bo Hong, Xiaoqin Wang
Previous studies have shown insular activations involving sensory, motor, and affective processing. However, the functional roles of subdivisions within the human insula are still not well understood. In the present study, we used intracranial electroencephalography and electrical cortical stimulation to investigate the causal roles of subdivisions of the insula in auditory emotion perception in epilepsy patients implanted with depth electrodes in this brain region. The posterior and the anterior subdivisions of the human insula, identified based on structural and functional analyses, showed distinct response properties to auditory emotional stimuli...
January 12, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29342054/multicenter-us-clinical-trial-with-an-electric-acoustic-stimulation-eas-system-in-adults-final-outcomes
#18
Harold C Pillsbury, Margaret T Dillon, Craig A Buchman, Hinrich Staecker, Sandra M Prentiss, Michael J Ruckenstein, Douglas C Bigelow, Fred F Telischi, Diane M Martinez, Christina L Runge, David R Friedland, Nikolas H Blevins, Jannine B Larky, George Alexiades, David M Kaylie, Peter S Roland, Richard T Miyamoto, Douglas D Backous, Frank M Warren, Hussam K El-Kashlan, Heidi K Slager, Carisa Reyes, Allison I Racey, Oliver F Adunka
OBJECTIVE: To demonstrate the safety and effectiveness of the MED-EL Electric-Acoustic Stimulation (EAS) System, for adults with residual low-frequency hearing and severe-to-profound hearing loss in the mid to high frequencies. STUDY DESIGN: Prospective, repeated measures. SETTING: Multicenter, hospital. PATIENTS: Seventy-three subjects implanted with PULSAR or SONATA cochlear implants with FLEX electrode arrays. INTERVENTION: Subjects were fit postoperatively with an audio processor, combining electric stimulation and acoustic amplification...
January 16, 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29341416/resveratrol-influences-pancreatic-islets-by-opposing-effects-on-electrical-activity-and-insulin-release
#19
Simone Brouwer, Theresa Hoffmeister, Anne Gresch, Lisa Schönhoff, Martina Düfer
SCOPE: Resveratrol is suggested to improve glycemic control by activation of sirtuin 1 (SIRT1) and has already been tested clinically. Our investigation characterizes the targets of resveratrol in pancreatic beta cells and their contribution to short- and long-term effects on insulin secretion. METHODS AND RESULTS: Islets or beta cells were isolated from C57Bl/6N mice. Electrophysiology was performed with microelectrode arrays and patch-clamp technique, insulin secretion and content were determined by radioimmunoassay, cAMP was measured by enzyme-linked immunosorbent assay and cytosolic Ca2+ concentration by fluorescence methods...
January 17, 2018: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/29341361/parvalbumin-interneuron-mediated-feedforward-inhibition-controls-signal-output-in-the-deep-layers-of-the-perirhinal-entorhinal-cortex
#20
Janske G P Willems, Wytse J Wadman, Natalie L M Cappaert
The perirhinal (PER) and lateral entorhinal (LEC) cortex form an anatomical link between the neocortex and the hippocampus. However, neocortical activity is transmitted through the PER and LEC to the hippocampus with a low probability, suggesting the involvement of the inhibitory network. This study explored the role of interneuron mediated inhibition, activated by electrical stimulation in the agranular insular cortex (AiP), in the deep layers of the PER and LEC. Activated synaptic input by AiP stimulation rarely evoked action potentials in the PER-LEC deep layer excitatory principal neurons, most probably because the evoked synaptic response consisted of a small excitatory and large inhibitory conductance...
January 17, 2018: Hippocampus
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