P034 Utility of transcranial magnetic stimulation in the diagnosis of central nervous system lesions mimicking peripheral mononeuropathies

2008 ◽  
Vol 119 ◽  
pp. S79
Author(s):  
Nuria Raguer ◽  
Karina Breitenbucher ◽  
Carlos Sanchez ◽  
Margarida Gratacos ◽  
Manolo Benito ◽  
...  
2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Mengchu Cui ◽  
Hongfei Ge ◽  
Hengli Zhao ◽  
Yongjie Zou ◽  
Yujie Chen ◽  
...  

Localized magnetic fields (MFs) could easily penetrate the scalp, skull, and meninges, thus inducing an electrical current in both the central and peripheral nervous systems, which is primarily used in transcranial magnetic stimulation (TMS) for inducing specific effects on different regions or cells that play roles in various brain activities. Studies of repetitive transcranial magnetic stimulation (rTMS) have led to novel attractive therapeutic approaches. Neural stem cells (NSCs) in adult human brain are able to self-renew and possess multidifferential ability to maintain homeostasis and repair damage after acute central nervous system. In the present review, we summarized the electrical activity of NSCs and the fundamental mechanism of electromagnetic fields and their effects on regulating NSC proliferation, differentiation, migration, and maturation. Although it was authorized for the rTMS use in resistant depression patients by US FDA, there are still unveiling mechanism and limitations for rTMS in clinical applications of acute central nervous system injury, especially on NSC regulation as a rehabilitation strategy. More in-depth studies should be performed to provide detailed parameters and mechanisms of rTMS in further studies, making it a powerful tool to treat people who are surviving with acute central nervous system injuries.


Author(s):  
John Rothwell ◽  
Ricci Hannah

Transcranial magnetic stimulation (TMS) can be viewed as interacting with voluntary movement in two ways: it can used to probe the excitability of central nervous system (CNS) pathways before, during, and after a movement; alternatively, it can be used to interfere with movement and give information about the role of different cortical areas in different aspects of a task. This chapter concentrates on the role of single and paired pulse TMS methods that have been covered in detail in previous chapters. Long lasting effects of repetitive TMS (rTMS) are described in later chapters. Almost all of the TMS measures described in previous chapters differ in subjects at rest and during tonic voluntary activity.


2021 ◽  
Vol 11 (3) ◽  
pp. 384
Author(s):  
Arthur R. Chaves ◽  
Nicholas J. Snow ◽  
Lynsey R. Alcock ◽  
Michelle Ploughman

Transcranial magnetic stimulation (TMS) is a non-invasive method used to investigate neurophysiological integrity of the human neuromotor system. We describe in detail, the methodology of a single pulse TMS protocol that was performed in a large cohort of people (n = 110) with multiple sclerosis (MS). The aim was to establish and validate a core-set of TMS variables that predicted typical MS clinical outcomes: walking speed, hand dexterity, fatigue, and cognitive processing speed. We provide a brief and simple methodological pipeline to examine excitatory and inhibitory corticospinal mechanisms in MS that map to clinical status. Delayed and longer ipsilateral silent period (a measure of transcallosal inhibition; the influence of one brain hemisphere’s activity over the other), longer cortical silent period (suggestive of greater corticospinal inhibition via GABA) and higher resting motor threshold (lower corticospinal excitability) most strongly related to clinical outcomes, especially when measured in the hemisphere corresponding to the weaker hand. Greater interhemispheric asymmetry (imbalance between hemispheres) correlated with poorer performance in the greatest number of clinical outcomes. We also show, not surprisingly, that TMS variables related more strongly to motor outcomes than non-motor outcomes. As it was validated in a large sample of patients with varying severities of central nervous system dysfunction, the protocol described herein can be used by investigators and clinicians alike to investigate the role of TMS as a biomarker in MS and other central nervous system disorders.


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