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peripheral nerve field stimulation

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https://www.readbyqxmd.com/read/29026822/intraoperative-nerve-stimulation-during-brachial-plexus-surgery-comparison-between-a-totally-disposable-nerve-stimulator-and-nerve-stimulator-normally-used-for-nerve-blocks
#1
Ahmed Thallaj, Wadha M Alotaibi, Tariq AlZahrani, Abdulaziz S Abaalkhail, Amel A F El-Sayed, Mohammad M Al-Qattan
BACKGROUND: Intraoperative nerve stimulation is done routinely in brachial plexus and peripheral nerve surgery as well as in selective neurectomy in spastic patients. OBJECTIVE: The current study compares the use of 2 different devices for nerve stimulation: a totally disposable nerve stimulator and a nerve stimulator used for nerve blocks by anesthetists. METHODS: A retrospective study of 60 patients who underwent brachial plexus surgery: In 30 patients, we used the totally disposable nerve stimulator (group 1) and in another 30 patients, we used the anesthesia device (group 2)...
August 2017: Plastic Surgery
https://www.readbyqxmd.com/read/28983969/a-high-performance-gradient-insert-for-rapid-and-short-t2-imaging-at-full-duty-cycle
#2
Markus Weiger, Johan Overweg, Manuela Barbara Rösler, Romain Froidevaux, Franciszek Hennel, Bertram Jakob Wilm, Alexander Penn, Urs Sturzenegger, Wout Schuth, Menno Mathlener, Martino Borgo, Peter Börnert, Christoph Leussler, Roger Luechinger, Benjamin Emanuel Dietrich, Jonas Reber, David Otto Brunner, Thomas Schmid, Laetitia Vionnet, Klaas P Pruessmann
PURPOSE: The goal of this study was to devise a gradient system for MRI in humans that reconciles cutting-edge gradient strength with rapid switching and brings up the duty cycle to 100% at full continuous amplitude. Aiming to advance neuroimaging and short-T2 techniques, the hardware design focused on the head and the extremities as target anatomies. METHODS: A boundary element method with minimization of power dissipation and stored magnetic energy was used to design anatomy-targeted gradient coils with maximally relaxed geometry constraints...
October 5, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28972267/electronically-rotated-and-translated-field-free-line-generation-for-open-bore-magnetic-particle-imaging
#3
Can Barış Top, Serhat Ilbey, Hüseyin Emre Güven
PURPOSE: We propose a coil arrangement for open bore field free line (FFL) Magnetic Particle Imaging (MPI) system, which is suitable for accessing the subject from the sides. The purpose of this study is twofold, to show that the FFL can be rotated and translated electronically in a volume of interest with this arrangement and to analyze the current, voltage and power requirements for a 1 T/m gradient human sized scanner for a 200 mm diameter x 200 mm height cylindrical field of view (FOV)...
October 3, 2017: Medical Physics
https://www.readbyqxmd.com/read/28874684/damage-free-peripheral-nerve-stimulation-by-12-ns-pulsed-electric-field
#4
Maura Casciola, Shu Xiao, Andrei G Pakhomov
Modern technologies enable deep tissue focusing of nanosecond pulsed electric field (nsPEF) for non-invasive nerve and muscle stimulation. However, it is not known if PEF orders of magnitude shorter than the activation time of voltage-gated sodium channels (VGSC) would evoke action potentials (APs). One plausible scenario requires the loss of membrane integrity (electroporation) and resulting depolarization as an intermediate step. We report, for the first time, that the excitation of a peripheral nerve can be accomplished by 12-ns PEF without electroporation...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28744193/on-the-origin-of-the-1-000-hz-peak-in-the-spectrum-of-the-human-tympanic-electrical-noise
#5
Javiera Pardo-Jadue, Constantino D Dragicevic, Macarena Bowen, Paul H Delano
The spectral analysis of the spontaneous activity recorded with an electrode positioned near the round window of the guinea pig cochlea shows a broad energy peak between 800 and 1,000 Hz. This spontaneous electric activity is called round window noise or ensemble background activity. In guinea pigs, the proposed origin of this peak is the random sum of the extracellular field potentials generated by action potentials of auditory nerve neurons. In this study, we used a non-invasive method to record the tympanic electric noise (TEN) in humans by means of a tympanic wick electrode...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28743633/an-intra-neural-microstimulation-system-for-ultra-high-field-magnetic-resonance-imaging-and-magnetoencephalography
#6
Paul M Glover, Roger H Watkins, George C O'Neill, Rochelle Ackerley, Rosa Sanchez-Panchuelo, Francis McGlone, Matthew J Brookes, Johan Wessberg, Susan T Francis
BACKGROUND: Intra-neural microstimulation (INMS) is a technique that allows the precise delivery of low-current electrical pulses into human peripheral nerves. Single unit INMS can be used to stimulate individual afferent nerve fibres during microneurography. Combining this with neuroimaging allows the unique monitoring of central nervous system activation in response to unitary, controlled tactile input, with functional magnetic resonance imaging (fMRI) providing exquisite spatial localisation of brain activity and magnetoencephalography (MEG) high temporal resolution...
October 1, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28706244/predicting-magnetostimulation-thresholds-in-the-peripheral-nervous-system-using-realistic-body-models
#7
Mathias Davids, Bastien Guérin, Matthias Malzacher, Lothar R Schad, Lawrence L Wald
Rapid switching of applied magnetic fields in the kilohertz frequency range in the human body induces electric fields powerful enough to cause Peripheral Nerve Stimulation (PNS). PNS has become one of the main constraints on the use of high gradient fields for fast imaging with the latest MRI gradient technology. In recent MRI gradients, the applied fields are powerful enough that PNS limits their application in fast imaging sequences like echo-planar imaging. Application of Magnetic Particle Imaging (MPI) to humans is similarly PNS constrained...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28676575/maintenance-of-mouse-gustatory-terminal-field-organization-is-disrupted-following-selective-removal-of-peripheral-sodium-salt-taste-activity-at-adulthood
#8
Rolf Skyberg, Chengsan Sun, David L Hill
Neural activity plays a critical role in the development of central circuits in sensory systems. However, the maintenance of these circuits at adulthood is usually not dependent on sensory-elicited neural activity. Recent work in the mouse gustatory system showed that selectively deleting the primary transduction channel for sodium taste, the epithelial sodium channel (ENaC), throughout development dramatically impacted the organization of the central terminal fields of three nerves that carry taste information to the nucleus of the solitary tract...
August 9, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28644548/repetitive-peripheral-magnetic-stimulation-for-activities-of-daily-living-and-functional-ability-in-people-after-stroke
#9
REVIEW
Ryo Momosaki, Naoki Yamada, Erika Ota, Masahiro Abo
BACKGROUND: Repetitive peripheral magnetic stimulation (rPMS) is a form of therapy that creates painless stimulation of deep muscle structures to improve motor function in people with physical impairment from brain or nerve disorders. Use of rPMS for people after stroke has been identified as a feasible approach to improve activities of daily living and functional ability. However, no systematic reviews have assessed the findings of available trials. The effect and safety of this intervention for people after stroke currently remain uncertain...
June 23, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28620284/electrophysiological-measurements-of-peripheral-vestibular-function-a-review-of-electrovestibulography
#10
REVIEW
Daniel J Brown, Christopher J Pastras, Ian S Curthoys
Electrocochleography (EcochG), incorporating the Cochlear Microphonic (CM), the Summating Potential (SP), and the cochlear Compound Action Potential (CAP), has been used to study cochlear function in humans and experimental animals since the 1930s, providing a simple objective tool to assess both hair cell (HC) and nerve sensitivity. The vestibular equivalent of ECochG, termed here Electrovestibulography (EVestG), incorporates responses of the vestibular HCs and nerve. Few research groups have utilized EVestG to study vestibular function...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28600233/effect-of-tissue-heterogeneity-on-the-transmembrane-potential-of-type-1-spiral-ganglion-neurons-a-simulation-study
#11
Kiran Sriperumbudur, Hans Wilhelm Pau, Ursula van Rienen
Electric stimulation of the auditory nerve by cochlear implants has been a successful clinical intervention to treat the sensory neural deafness. In this pathological condition of the cochlea, type-1 spiral ganglion neurons in Rosenthal's canal play a vital role in the action potential initiation. Various morphological studies of the human temporal bones suggest that the spiral ganglion neurons are surrounded by heterogeneous structures formed by a variety of cells and tissues. However, the existing simulation models have not considered the tissue heterogeneity in the Rosenthal's canal while studying the electric field interaction with spiral ganglion neurons...
June 5, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28505985/upper-limb-robotics-applied-to-neurorehabilitation-an-overview-of-clinical-practice
#12
Christophe Duret, Stefano Mazzoleni
BACKGROUND: During the last two decades, extensive interaction between clinicians and engineers has led to the development of systems that stimulate neural plasticity to optimize motor recovery after neurological lesions. This has resulted in the expansion of the field of robotics for rehabilitation. Studies in patients with stroke-related upper-limb paresis have shown that robotic rehabilitation can improve motor capacity. However, few other applications have been evaluated (e.g. tremor, peripheral nerve injuries or other neurological diseases)...
2017: NeuroRehabilitation
https://www.readbyqxmd.com/read/28500566/an-update-on-addressing-important-peripheral-nerve-problems-challenges-and-potential-solutions
#13
Wilson Z Ray, Mark A Mahan, Danzhu Guo, Danqing Guo, Michel Kliot
From time to time it is thoughtful and productive to review a medical field and reflect upon what are the major issues that need to be addressed and what is being done to do so. This review article is not meant to be all-inclusive but rather focuses on four evolving areas in the field of peripheral nerve disorders and treatments: (1) nerve surgery under ultrasound guidance using a new ultra-minimally invasive thread technique; (2) evolving magnetic resonance imaging (MRI) and ultrasound imaging techniques that are helping to both diagnose and treat a variety of peripheral nerve problems including entrapment neuropathies, traumatic nerve injuries, and masses arising from nerves; (3) promoting recovery after nerve injury using electrical stimulation; and (4) developing animal models to reproduce a severe nerve injury (neurotmetic grade in continuity) that requires a surgical intervention and repair...
May 12, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28483189/acupuncture-points-and-their-relationship-with-multireceptive-fields-of-neurons
#14
REVIEW
Salvador Quiroz-González, Sergio Torres-Castillo, Rosa Estela López-Gómez, Ismael Jiménez Estrada
In Traditional Chinese Medicine, acupuncture points (APs) have been emphasized as key elements that generate the therapeutic effects of acupuncture. At the spinal cord or supraspinal level, sensory neurons located in the dorsal horn receive an extensive supply of sensory information from skin and muscle receptors through peripheral afferent nerves. The stimulated skin area that influences the activity of a spinal sensory neuron is known as the peripheral receptive field (RF) of that neuron. By considering that a particular AP location involves the activation of one or various RFs, it can be assumed that several sensory central neurons are the site of convergence of the peripheral input generated by acupuncture stimulation...
April 2017: Journal of Acupuncture and Meridian Studies
https://www.readbyqxmd.com/read/28441282/magnetic-field-reference-levels-for-arbitrary-periodic-waveforms-for-prevention-of-peripheral-nerve-stimulation
#15
Gregory B Gajda, Stephen H Bly
Guidelines for prevention of peripheral nerve stimulation from exposure to low frequency magnetic fields have been developed by standard-setting bodies. Exposure limits or reference levels (RLs) are typically set in terms of the maximum root-mean-square amplitude of a sinusoidal waveform; however, environmental flux densities are often periodic, non-sinusoidal waveforms. This work presents a procedure for deriving RLs for any generalized periodic waveform using the empirical nerve-stimulation threshold data obtained from human volunteer MRI experiments...
June 2017: Health Physics
https://www.readbyqxmd.com/read/28360885/circadian-rhythm-influences-the-promoting-role-of-pulsed-electromagnetic-fields-on-sciatic-nerve-regeneration-in-rats
#16
Shu Zhu, Jun Ge, Zhongyang Liu, Liang Liu, Da Jing, Mingzi Ran, Meng Wang, Liangliang Huang, Yafeng Yang, Jinghui Huang, Zhuojing Luo
Circadian rhythm (CR) plays a critical role in the treatment of several diseases. However, the role of CR in the treatment of peripheral nerve defects has not been studied. It is also known that the pulsed electromagnetic fields (PEMF) can provide a beneficial microenvironment to quicken the process of nerve regeneration and to enhance the quality of reconstruction. In this study, we evaluate the impact of CR on the promoting effect of PEMF on peripheral nerve regeneration in rats. We used the self-made "collagen-chitosan" nerve conduits to bridge the 15-mm nerve gaps in Sprague-Dawley rats...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28269263/a-wireless-system-with-stimulation-and-recording-capabilities-for-interfacing-peripheral-nerves-in-rodents
#17
P Schonle, F Michoud, N Brun, A Guex, S P Lacour, Q Wang, Q Huang
Considerable progress has been made in the last decade in implantable bioelectronic neurosystems. Yet most neural implants are used in acute and tethered experimental conditions. Here, we present a preliminary prototype of a multichannel system for simultaneous peripheral nerve stimulation and neural recording. The system comprises miniaturized electronics with a total volume of less then 1.4cm3 including a 3.7V battery which is expected to last for 94 days of standby operation or 18 hours of continuous recording and stimulation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28265687/activation-of-the-thalamic-parafascicular-nucleus-by-electrical-stimulation-of-the-peripheral-vestibular-nerve-in-rats
#18
Nari Kim, Myoung Ae Choi, Ho Koo, Byung Rim Park, Sang Who Han, Chaejoon Cheong, Min Sun Kim
The parafascicular nucleus (PFN) of the thalamus is a primary structure in the feedback circuit of the basal ganglia-thalamo-cortical system, as well as in the neural circuit of the vestibulo-thalamo-striatal pathway. We investigated the characteristics of the functional connectivity between the peripheral vestibular system and the PFN in rats. A single electrical stimulation was applied to the horizontal semicircular canal nerve in the peripheral vestibular end-organs. This resulted in polysynaptic local field potentials (LFPs) in the PFN, which were composed of long-lasting multiple waves...
May 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28251523/atypical-facial-pain-a-comprehensive-evidence-based-review
#19
REVIEW
Austin L Weiss, Ken P Ehrhardt, Reda Tolba
PURPOSE OF REVIEW: The purpose of this article is to focus on an excruciating disorder of the face, named atypical facial pain or persistent idiopathic facial pain (PIFP). It is considered an underdiagnosed condition with limited treatment options. Facial pain can be a debilitating disorder that affects patients' quality of life. Up to 26% of the general population has suffered from facial pain at some point in their lives. It is important to highlight the different types of facial pain to be able to properly manage this condition accordingly...
February 2017: Current Pain and Headache Reports
https://www.readbyqxmd.com/read/28227497/a-wireless-system-with-stimulation-and-recording-capabilities-for-interfacing-peripheral-nerves-in-rodents
#20
P Schonle, F Michoud, N Brun, A Guex, S P Lacour, Q Wang, Q Huang, P Schonle, F Michoud, N Brun, A Guex, S P Lacour, Q Wang, Q Huang, N Brun, A Guex, P Schonle, Q Huang, Q Wang, S P Lacour, F Michoud
Considerable progress has been made in the last decade in implantable bioelectronic neurosystems. Yet most neural implants are used in acute and tethered experimental conditions. Here, we present a preliminary prototype of a multichannel system for simultaneous peripheral nerve stimulation and neural recording. The system comprises miniaturized electronics with a total volume of less then 1.4cm(3) including a 3.7V battery which is expected to last for 94 days of standby operation or 18 hours of continuous recording and stimulation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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