Special Issue "New Insights into Neurophysiology and Neuroimaging of Movement Disorders"

A special issue of Journal of Clinical Medicine (ISSN 2077-0383). This special issue belongs to the section "Clinical Neurology".

Deadline for manuscript submissions: closed (31 May 2022) | Viewed by 3440

Special Issue Editor

Hospital Universitario Ramón y Cajal, Departamento de Neurofisiología Clínica, Madrid, Spain
Interests: clinical neurophysiology; movement disorders; imaging
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Movement disorders can be studied by clinical neurophysiology and neuroimaging techniques. Utilizing and understanding electrophysiology and multimodal imaging is crucial to provide an accurate early diagnosis of distinct movement disorders, enhance our understanding of their pathophysiological mechanisms, and provide both invasive and non-invasive treatment options.

This Special Issue will focus on electrophysiological aspects of tremor, dystonia, myoclonus, parkinsonism, and functional movement disorders. It will show how electrophysiology can help clinicians diagnose distinct movement disorders and enhance understanding of their pathological mechanisms and treatment effects and options.

The advanced stage of idiopathic Parkinson’s disease (PD) is often characterized by gait alterations and postural instability. There is an unmet need for further symptomatic therapeutic strategies, particularly as gait disturbances generally respond unfavorably to dopaminergic medication and conventional deep brain stimulation of the subthalamic nucleus in advanced disease stages. Recent pathophysiological research pointed to nigro-pontine networks entrained to locomotor integration. The substantia nigra pars reticulata - entrained into integrative locomotor networks - is pathologically overactive in PD. High-frequent stimulation of the substantia nigra pars reticulata preferentially modulated axial symptoms and therefore is suggested as a novel therapeutic candidate target for neuromodulation of refractory gait disturbances in PD.

Novel deep brain stimulation (DBS) lead designs are currently entering the market, which are hypothesized to provide a way to steer the stimulation field away from neural populations responsible for side effects and towards populations responsible for beneficial effects. To target "sweet spots" for stimulation, neuroimaging tools are mandatory. There is an interest whether a Brain Atlas is applicable for the visualization of stimulation sites. For postoperative documentation, stimulation sites in individual patients can be projected on an atlas. There are a number of two-dimensional atlases that use the intercommissural line as a reference. In a different approach, a high-resolution, three-dimensional model of thalamic and subthalamic structures (3D-Morel Atlas) was recently constructed by combining information contained in histological data from ten post-mortem brains.

Overall, the main goal of this Special Issue is a comprehensive overview of the state-of-the-art on this important research field.

Dr. Ignacio Regidor Bailly-Bailliere
Guest Editor

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Keywords

  • Movement disorders
  • clinical neurophysiology
  • neuroimaging techniques
  • electrophysiology
  • multimodal imaging
  • Neuromodulation
  • Novel deep brain stimulation
  • neuronal activity
  • gait disorders
  • postural instability

Published Papers (2 papers)

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Research

Article
Combined Stimulation of the Substantia Nigra and the Subthalamic Nucleus for the Treatment of Refractory Gait Disturbances in Parkinson’s Disease: A Preliminary Study
J. Clin. Med. 2022, 11(8), 2269; https://doi.org/10.3390/jcm11082269 - 18 Apr 2022
Viewed by 1637
Abstract
Deep brain stimulation of the subthalamic nucleus is efficient for the treatment of motor symptoms (i.e., tremors) in patients with Parkinson’s disease. Gait disorders usually appear during advanced stages of idiopathic Parkinson’s disease in up to 80% of patients and have an important [...] Read more.
Deep brain stimulation of the subthalamic nucleus is efficient for the treatment of motor symptoms (i.e., tremors) in patients with Parkinson’s disease. Gait disorders usually appear during advanced stages of idiopathic Parkinson’s disease in up to 80% of patients and have an important impact on their quality of life. The effects of deep brain stimulation of the subthalamic nucleus on gait and balance are still controversial. For this reason, alternative targets have been considered, such as stimulation of the pedunculopontine nucleus and the pars reticulata of substantia nigra, involved in the integration of the functional connections for gait. Due to the proximity of the subthalamic nucleus to the substantia nigra, their combined stimulation is feasible and may lead to better outcomes, improving axial symptoms. Our objective was to prospectively compare simultaneous stimulation of both structures versus conventional subthalamic stimulation in improving gait disorders. In ten patients with advanced Parkinson’s disease, deep brain stimulation leads (eight linear contacts) were implanted, and gait analysis was performed 6 months after surgery in off-stimulation and after 4 weeks of dual or single subthalamic stimulation. An improvement in gait parameters was confirmed with both stimulation conditions, with better results with combined substantia nigra and subthalamic stimulation compared with conventional subthalamic stimulation. Further studies are needed to determine if this effect remains after long-term dual-target stimulation. Full article
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Article
Can Corticomuscular Coherence Differentiate between REM Sleep Behavior Disorder with or without Parkinsonism?
J. Clin. Med. 2021, 10(23), 5585; https://doi.org/10.3390/jcm10235585 - 27 Nov 2021
Cited by 1 | Viewed by 1185
Abstract
REM sleep behavior disorder (RBD) could be a predictor of Parkinsonism even before development of typical motor symptoms. This study aims to characterize clinical features and corticomuscular and corticocortical coherence (CMC and CCC, respectively) during sleep in RBD patients with or without Parkinsonism. [...] Read more.
REM sleep behavior disorder (RBD) could be a predictor of Parkinsonism even before development of typical motor symptoms. This study aims to characterize clinical features and corticomuscular and corticocortical coherence (CMC and CCC, respectively) during sleep in RBD patients with or without Parkinsonism. We enrolled a total of 105 subjects, including 20 controls, 54 iRBD, and 31 RBD+P patients, patients who were diagnosed as idiopathic RBD (iRBD) and RBD with Parkinsonism (RBD+P) in our neurology department. We analyzed muscle atonia index (MAI) and CMC between EEG and chin/limb muscle electromyography (EMG) and CCC during different sleep stages. Although differences in the CMC of iRBD group were observed only during REM sleep, MAI differences between groups were noted during both REM and NREM N2 stage sleep. During REM sleep, CMC was higher and MAI was reduced in iRBD patients compared to controls (p = 0.001, p < 0.001, respectively). Interestingly, MAI was more reduced in RBD+P compared to iRBD patients. In comparison, CCC was higher in iRBD patients compared to controls whereas CCC was lower in RBD+P groups compared to control and iRBD groups in various frequency bands during both NREM N2 and REM sleep stages. Among them, increased CMC during REM sleep revealed correlation between clinical severities of RBD symptoms. Our findings indicate that MAI, CMC, and CCC showed distinctive features in iRBD and RBD+P patients compared to controls, suggesting potential usefulness to understand possible links between these diseases. Full article
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