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Neuromodulation of the dorsal root ganglion

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https://www.readbyqxmd.com/read/29888402/a-3d-magnetic-hyaluronic-acid-hydrogel-for-magnetomechanical-neuromodulation-of-primary-dorsal-root-ganglion-neurons
#1
Andy Tay, Ali Sohrabi, Kate Poole, Stephanie Seidlits, Dino Di Carlo
Neuromodulation tools are useful to decipher and modulate neural circuitries implicated in functions and diseases. Existing electrical and chemical tools cannot offer specific neural modulation while optogenetics has limitations for deep tissue interfaces, which might be overcome by miniaturized optoelectronic devices in the future. Here, a 3D magnetic hyaluronic hydrogel is described that offers noninvasive neuromodulation via magnetomechanical stimulation of primary dorsal root ganglion (DRG) neurons. The hydrogel shares similar biochemical and biophysical properties as the extracellular matrix of spinal cord, facilitating healthy growth of functional neurites and expression of excitatory and inhibitory ion channels...
June 10, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29794269/wireless-peripheral-nerve-stimulation-for-complex-regional-pain-syndrome-type-i-of-the-upper-extremity-a-case-illustration-introducing-a-novel-technology
#2
Daniel Herschkowitz, Jana Kubias
BACKGROUND: Complex regional pain syndrome (CRPS) is a debilitating painful disorder, cryptic in its pathophysiology and refractory condition with limited therapeutic options. Type I CRPS with its variable relationship to trauma has often no discernible fractures or nerve injuries and remains enigmatic in its response to conservative treatment as well as the other limited interventional therapies. Neuromodulation in the form of spinal cord and dorsal root ganglion stimulation (SCS, DRGS) has shown encouraging results, especially of causalgia or CRPS I of lower extremities...
April 13, 2018: Scandinavian Journal of Pain
https://www.readbyqxmd.com/read/29575331/retrospective-case-series-on-the-treatment-of-painful-diabetic-peripheral-neuropathy-with-dorsal-root-ganglion-stimulation
#3
Sam Eldabe, Anthony Espinet, Anders Wahlstedt, Porhan Kang, Liong Liem, Nikunj K Patel, Jan Vesper, Alicia Kimber, William Cusack, Jeffery Kramer
BACKGROUND: The dorsal root ganglion (DRG) has been identified as an important neural structure in the development and maintenance of chronic pain. We present a retrospective case series of patients with refractory painful diabetic peripheral neuropathy (PDPN) that underwent electrical stimulation of the DRG and report on changes in their overall perceived pain and complication rates. METHODS: Ten diabetic males (mean age 65.2 [SD 8.8] years) with painful symptoms of the lower limbs were enrolled and trialed with up to four quadripolar percutaneous DRG stimulation leads between L2 and L5 spinal levels...
March 25, 2018: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/29459654/photoelectrochemical-modulation-of-neuronal-activity-with-free-standing-coaxial-silicon-nanowires
#4
Ramya Parameswaran, João L Carvalho-de-Souza, Yuanwen Jiang, Michael J Burke, John F Zimmerman, Kelliann Koehler, Andrew W Phillips, Jaeseok Yi, Erin J Adams, Francisco Bezanilla, Bozhi Tian
Optical methods for modulating cellular behaviour are promising for both fundamental and clinical applications. However, most available methods are either mechanically invasive, require genetic manipulation of target cells or cannot provide subcellular specificity. Here, we address all these issues by showing optical neuromodulation with free-standing coaxial p-type/intrinsic/n-type silicon nanowires. We reveal the presence of atomic gold on the nanowire surfaces, likely due to gold diffusion during the material growth...
March 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/29230247/wireless-neuromodulation-for-chronic-back-pain-delivery-of-high-frequency-dorsal-root-ganglion-stimulation-by-a-minimally-invasive-technique
#5
Bart Billet, Roel Wynendaele, Niek E Vanquathem
Objective: To evaluate the analgesic effect of a dorsal root ganglion (DRG) stimulation technology utilizing high-frequency pulse rates to treat intractable chronic back and leg pain. Methods: This case study presents the outcomes, with a novel, wireless, minimally invasive miniature neurostimulator system in a case of chronic back pain. The subject was implanted bilaterally with a Freedom 4A quadripolar electrode array at the L2 dorsal root ganglion. Stimulation was applied using 10 kHz pulse rate and 30 μs pulse width...
2017: Case Reports in Medicine
https://www.readbyqxmd.com/read/29152818/electrical-stimulation-of-dorsal-root-ganglion-in-the-context-of-pain-a-systematic-review-of-in-vitro-and-in-vivo-animal-model-studies
#6
REVIEW
Ivana Vuka, Katarina Vučić, Tihana Repić, Lejla Ferhatović Hamzić, Damir Sapunar, Livia Puljak
OBJECTIVE: Dorsal root ganglion (DRG) has recently emerged as an attractive target for neuromodulation therapy since primary sensory neurons and their soma in DRGs are important sites for pathophysiologic changes that lead to neuropathic pain. Our aim was to create evidence synthesis about the effects of electrical stimulation of DRG in the context of pain from in vitro and in vivo animal models, analyze methodology and quality of studies in the field. METHODS: For conducting systematic review we searched three data bases: MEDLINE, Embase and Web of Science...
April 2018: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/29026048/spinal-cord-stimulation-for-chronic-non-cancer-pain-a-review-of-current-evidence-and-practice
#7
S Sc Wong, C W Chan, C W Cheung
Spinal cord stimulation provides analgesia through electrical stimulation of the dorsal column of the spinal cord via electrode leads placed into the epidural space. In traditional tonic stimulation, a painful sensation is replaced with paraesthesia. Spinal cord stimulation is effective in reducing neuropathic pain, enhancing function, and improving quality of life in different chronic pain conditions. Currently, there is most evidence to support its use for failed back surgery syndrome when multidisciplinary conventional management is unsuccessful...
October 2017: Hong Kong Medical Journal, Xianggang Yi Xue za Zhi
https://www.readbyqxmd.com/read/28973357/a-prospective-analysis-of-neuromonitoring-for-confirmation-of-lead-placement-in-dorsal-root-ganglion-stimulation
#8
Steven M Falowski, Andreas Dianna
BACKGROUND: Dorsal root ganglion stimulation is a neuromodulation therapy used for chronic neuropathic pain. Typically, patients are awakened intraoperatively to confirm adequate placement. OBJECTIVE: To determine whether neuromonitoring can confirm placement in an asleep patient. METHODS: This is a prospective analysis of 12 leads placed in 6 patients. Lead confirmation was confirmed by awake intraoperative testing, as well as asleep testing utilizing neuromonitoring...
June 1, 2018: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28827823/comparison-of-efficacy-of-continuous-epidural-block-and-pulsed-radiofrequency-to-the-dorsal-root-ganglion-for-management-of-pain-persisting-beyond-the-acute-phase-of-herpes-zoster
#9
COMPARATIVE STUDY
Eung Don Kim, Young In Lee, Hue Jung Park
BACKGROUND: There is little evidence regarding the effectiveness of intervention methods in the treatment of zoster-related pain (ZAP) after the acute phase of zoster. Generally, if ZAP remains after more than 180 days from its onset, the likelihood of pain reduction is very low; this condition is considered as a "well established" post-herpetic neuralgia (PHN). Although the clinical efficacy of intrathecal steroid injection and spinal cord stimulation (SCS) for ZAP management has been reported, these interventions are not widely used due to inherent disadvantages...
2017: PloS One
https://www.readbyqxmd.com/read/28676344/crispr-epigenome-editing-of-akap150-in-drg-neurons-abolishes-degenerative-ivd-induced-neuronal-activation
#10
Joshua D Stover, Niloofar Farhang, Kristofer C Berrett, Jason Gertz, Brandon Lawrence, Robby D Bowles
Back pain is a major contributor to disability and has significant socioeconomic impacts worldwide. The degenerative intervertebral disc (IVD) has been hypothesized to contribute to back pain, but a better understanding of the interactions between the degenerative IVD and nociceptive neurons innervating the disc and treatment strategies that directly target these interactions is needed to improve our understanding and treatment of back pain. We investigated degenerative IVD-induced changes to dorsal root ganglion (DRG) neuron activity and utilized CRISPR epigenome editing as a neuromodulation strategy...
September 6, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28530662/pd-l1-inhibits-acute-and-chronic-pain-by-suppressing-nociceptive-neuron-activity-via-pd-1
#11
Gang Chen, Yong Ho Kim, Hui Li, Hao Luo, Da-Lu Liu, Zhi-Jun Zhang, Mark Lay, Wonseok Chang, Yu-Qiu Zhang, Ru-Rong Ji
Programmed cell death ligand-1 (PD-L1) is typically produced by cancer cells and suppresses immunity through the receptor PD-1 expressed on T cells. However, the role of PD-L1 and PD-1 in regulating pain and neuronal function is unclear. Here we report that both melanoma and normal neural tissues including dorsal root ganglion (DRG) produce PD-L1 that can potently inhibit acute and chronic pain. Intraplantar injection of PD-L1 evoked analgesia in naive mice via PD-1, whereas PD-L1 neutralization or PD-1 blockade induced mechanical allodynia...
July 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28486758/stimulation-of-the-l2-l3-dorsal-root-ganglia-induces-effective-pain-relief-in-the-low-back
#12
Frank Huygen, Liong Liem, William Cusack, Jeffery Kramer
INTRODUCTION: Chronic low back pain affects millions of people worldwide and can arise through a variety of clinical origins. In the case of failed back surgery syndrome (FBSS), previous surgical procedures can contribute to low back pain that is often unresponsive to intervention. Although spinal cord stimulation (SCS) can be an effective treatment modality, it does not provide sufficient pain relief for some intractable cases. Recently, alternative neuromodulation options have been developed, including dorsal root ganglion (DRG) stimulation...
February 2018: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/28350939/the-advancing-role-of-neuromodulation-for-the-management-of-chronic-treatment-refractory-pain
#13
REVIEW
Mohammed F Shamji, Cecile De Vos, Ashwini Sharan
Neuropathic pain is a common cause of disability and health care utilization. While judicious pharmacotherapy and management of comorbid psychological distress can provide for improved quality of life, some patients with treatment-refractory disease require more invasive therapies. Spinal cord stimulation can provide for improvement in pain and decrease in medication utilization, with level 1 evidence supporting its use across various pain etiologies including persistent postoperative neuropathic pain, complex regional pain syndrome, chronic inoperable limb ischemia, treatment refractory angina, and painful diabetic neuropathy...
March 1, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28337820/selective-radiofrequency-stimulation-of-the-dorsal-root-ganglion-drg-as-a-method-for-predicting-targets-for-neuromodulation-in-patients-with-post-amputation-pain-a-case-series
#14
Corey W Hunter, Ajax Yang, Tim Davis
OBJECTIVE: While spinal cord stimulation (SCS) has established itself as an accepted and validated treatment for neuropathic pain, there are a number of conditions where it has experienced less, long-term success: post amputee pain (PAP) being one of them. Dorsal root ganglion (DRG) stimulation has shown great promise, particularly in conditions where traditional SCS has fallen short. One major difference between DRG stimulation and traditional SCS is the ability to provide focal stimulation over targeted areas...
October 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28160397/alternate-intraspinal-targets-for-spinal-cord-stimulation-a-systematic-review
#15
REVIEW
George C Chang Chien, Nagy Mekhail
BACKGROUND: Conventional dorsal column spinal cord stimulation (SCS) provides less than optimal pain relief for certain pain syndromes and anatomic pain distributions. Practitioners have sought to treat these challenging therapeutic areas with stimulation of alternate intraspinal targets. OBJECTIVE: To identify and systematically review the evidence for the value neuromodulating specific neuronal targets within the spinal canal to achieve relief of chronic pain...
October 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/27876655/dorsal-root-ganglion-stimulation-attenuates-the-bold-signal-response-to-noxious-sensory-input-in-specific-brain-regions-insights-into-a-possible-mechanism-for-analgesia
#16
Christopher P Pawela, Jeffery M Kramer, Quinn H Hogan
Targeted dorsal root ganglion (DRG) electrical stimulation (i.e. ganglionic field stimulation - GFS) is an emerging therapeutic approach to alleviate chronic pain. Here we describe blood oxygen-level dependent (BOLD) functional magnetic resonance imaging (fMRI) responses to noxious hind-limb stimulation in a rat model that replicates clinical GFS using an electrode implanted adjacent to the DRG. Acute noxious sensory stimulation in the absence of GFS caused robust BOLD fMRI response in brain regions previously associated with sensory and pain-related response, such as primary/secondary somatosensory cortex, retrosplenial granular cortex, thalamus, caudate putamen, nucleus accumbens, globus pallidus, and amygdala...
February 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/27676680/intrathecal-bupivacaine-monotherapy-with-a-retrograde-catheter-for-the-management-of-complex-regional-pain-syndrome-of-the-lower-extremity
#17
W Porter McRoberts, Catalina Apostol, Abdul Haleem
UNLABELLED: Complex regional pain syndrome (CRPS) presents a therapeutic challenge due to its many presentations and multifaceted pathophysiology. There is no approved treatment algorithm and clinical interventions are often applied empirically. In cases of CRPS where symptoms are localized to an extremity, a targeted treatment is indicated. We describe the use of intrathecal bupivacaine monotherapy, delivered through a retrograde catheter, in the treatment of CRPS affecting the lower extremity...
September 2016: Pain Physician
https://www.readbyqxmd.com/read/27445503/a-review-of-spinal-cord-stimulation-systems-for-chronic-pain
#18
REVIEW
Paul Verrills, Chantelle Sinclair, Adele Barnard
Spinal cord stimulation (SCS) applications and technologies are fast advancing. New SCS technologies are being used increasingly in the clinical environment, but often there is a lag period between the clinical application and the publishing of high-quality evidence on safety and efficacy. Recent developments will undoubtedly expand the applicability of SCS, allowing more effective and individualized treatment for patients, and may have the potential to salvage patients who have previously failed neuromodulation...
2016: Journal of Pain Research
https://www.readbyqxmd.com/read/27135465/photobiomodulation-of-the-dorsal-root-ganglion-for-the-treatment-of-low-back-pain-a-pilot-study
#19
RANDOMIZED CONTROLLED TRIAL
Vanessa Milanesi Holanda, Maria Cristina Chavantes, Daniela Fatima Teixeira Silva, Carlos Vanderlei M de Holanda, José Oswaldo de Oliveira, Xingjia Wu, Juanita J Anders
BACKGROUND AND OBJECTIVE: Chronic low back pain is a worldwide public health issue with high socioeconomic impact. The aim of this study was to determine the efficacy of laser irradiation of the dorsal root ganglion of the second lumbar spinal nerve for chronic axial low back pain compared to lidocaine injection and radiofrequency treatment. STUDY DESIGN/MATERIALS AND METHODS: Twenty-eight patients were randomly divided into three treatment groups: lidocaine injection, radiofrequency, or laser...
September 2016: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/27123351/s3-dorsal-root-ganglion-nerve-root-stimulation-for-refractory-postsurgical-perineal-pain-technical-aspects-of-anchorless-sacral-transforaminal-lead-placement
#20
X Zuidema, J Breel, F Wille
Chronic perineal pain limits patients in physical and sexual activities, leading to social and psychological distress. In most cases, this pain develops after surgery in the urogenital area or as a consequence of trauma. Neuromodulation is one of the options in chronic postsurgical perineal pain treatment. We present a case of refractory perineal pain after right sided surgical resection of a Bartholin's cyst which was treated with third sacral nerve root/dorsal root ganglion stimulation using the transforaminal approach...
2016: Case Reports in Neurological Medicine
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