Effects of Repetitive Peripheral Magnetic Stimulation on Pain, Disability, and Quality of Life in Chronic Low Back Pain Patients

Kim, Seong‐Gil; Nam, Seung-Min

doi:10.4283/jmag.2021.26.1.111

Cited by 3 publications

(2 citation statements)

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“…[22][23][24][25][26][27] MS uses similar TMS devices to target the peripheral nervous system (PNS) or peripheral magnetic stimulation (PMS) for investigational nerve conduction studies, [28][29][30][31] to treat different neurological [32][33][34] and musculoskeletal impairments. [34][35][36][37][38][39][40][41] In a typical PMS session, a standard figure-of -eight or a circular coil is applied over specific muscles or nerves, such as the trapezius and the deltoid, to treat migraine, 34,42,43 or the sacral nerve to treat urinary and fecal incontinence. [44][45][46] Furthermore, PMS is increasingly being studied for stimulating both the spinal root and the peripheral nerve levels in treating neuropathic pain.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, TMS can cause brief and controllable disruption of cortical activity in a specific brain region, allowing the exploration of brain‐behavior relationships 22–27 . MS uses similar TMS devices to target the peripheral nervous system (PNS) or peripheral magnetic stimulation (PMS) for investigational nerve conduction studies, 28–31 to treat different neurological 32–34 and musculoskeletal impairments 34–41 . In a typical PMS session, a standard figure‐of‐eight or a circular coil is applied over specific muscles or nerves, such as the trapezius and the deltoid, to treat migraine, 34,42,43 or the sacral nerve to treat urinary and fecal incontinence 44–46 .…”

Section: Introductionmentioning

confidence: 99%

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A study of flex miniaturized coils for focal nerve magnetic stimulation

et al. 2022

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Background: Peripheral magnetic stimulation (PMS) is emerging as a complement to standard electrical stimulation (ES) of the peripheral nervous system (PNS). PMS may stimulate sensory and motor nerve fibers without the discomfort associated with the ES used for standard nerve conduction studies. The PMS coils are the same ones used in transcranial magnetic stimulation (TMS) and lack focality and selectiveness in the stimulation. Purpose: This study presents a novel coil for PMS, developed using Flexible technologies, and characterized by reduced dimensions for a precise and controlled targeting of peripheral nerves. Methods: We performed hybrid electromagnetic (EM) and electrophysiological simulations to study the EM exposure induced by a novel miniaturized coil (or mcoil) in and around the radial nerve of the neuro-functionalized virtual human body model Yoon-Sun, and to estimate the current threshold to induce magnetic stimulation (MS) of the radial nerve. Eleven healthy subjects were studied with the mcoil, which consisted of two 15 mm diameter coils in a figure-ofeight configuration, each with a hundred turns of a 25 µm copper-clad four-layer foil. Sensory nerve action potentials (SNAPs) were measured in each subject using two electrodes and compared with those obtained from standard ES. The SNAPs conduction velocities were estimated as a performance metric. Results: The induced electric field was estimated numerically to peak at a maximum intensity of 39 V/m underneath the mcoil fed by 70 A currents. In such conditions, the electrophysiological simulations suggested that the mcoil elicits SNAPs originating at 7 mm from the center of the mcoil. Furthermore, the numerically estimated latencies and waveforms agreed with those obtained during the PMS experiments on healthy subjects, confirming the ability of the mcoil to stimulate the radial nerve sensory fibers. Conclusion: Hybrid EM-electrophysiological simulations assisted the development of a miniaturized coil with a small diameter and a high number of turns using flexible electronics. The numerical dosimetric analysis predicted the threshold current amplitudes required for a suprathreshold peripheral nerve sensory stimulation, which was experimentally confirmed. The developed and now validated computational pipeline will be used to improve the performances (e.g., focality and minimal currents) of new generations of mcoil designs.

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