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Differences in Dysfunction of Thenar and Hypothenar Motoneurons in Amyotrophic Lateral Sclerosis

Frontiers in human neuroscience, 2016-03, Vol.10, p.99-99 [Peer Reviewed Journal]

COPYRIGHT 2016 Frontiers Research Foundation ;2016. This work is licensed under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;Copyright © 2016 Fang, Cui, Liu, Guan, Li, Li, Cui, Shen and Ding. 2016 Fang, Cui, Liu, Guan, Li, Li, Cui, Shen and Ding ;ISSN: 1662-5161 ;EISSN: 1662-5161 ;DOI: 10.3389/fnhum.2016.00099 ;PMID: 27014030

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  • Title:
    Differences in Dysfunction of Thenar and Hypothenar Motoneurons in Amyotrophic Lateral Sclerosis
  • Author: Fang, Jia ; Cui, Liying ; Liu, Mingsheng ; Guan, Yuzhou ; Li, Xiaoguang ; Li, Dawei ; Cui, Bo ; Shen, Dongchao ; Ding, Qingyun
  • Subjects: Abductor digiti minimi ; abductor pollicis brevis ; Amyotrophic Lateral Sclerosis ; Atrophy ; Electrical stimuli ; F-wave ; Foot ; Hand ; motor neuron ; Motor neurons ; Nerve conduction ; Neurological research ; Neurology ; Neuroscience ; Physiological aspects ; Psychiatry ; Split-hand ; Studies ; Transcranial magnetic stimulation
  • Is Part Of: Frontiers in human neuroscience, 2016-03, Vol.10, p.99-99
  • Description: This study aimed to determine differences in spinal motoneuron dysfunction between the abductor pollicis brevis (APB) and the abductor digiti minimi (ADM) in amyotrophic lateral sclerosis (ALS) patients based on studying F-waves. Forty ALS patients and 20 normal controls (NCs) underwent motor nerve conduction studies on both median and ulnar nerves, including F-waves elicited by 100 electrical stimuli. The F-wave persistence (P < 0.05), index repeating neuron (RN; P < 0.001), and index repeater F-waves (Freps; P < 0.001) significantly differed between the APB and the ADM in the NC participants. For the hands of the ALS patients that lacked detectable wasting or weakness and exhibited either no or mild impairment of discrete finger movements, significantly reduced F-wave persistence (P < 0.001), increased index RN (P < 0.001), and increased index Freps (P < 0.001) were observed in APB in comparison with the normal participants, with relatively normal ADM F-wave parameters. For the hands of ALS patients that exhibited wasting and weakness, the mean F-wave amplitude (P < 0.05), the F/M amplitude ratio (P < 0.05), F-wave persistence (P < 0.001), index RN (P < 0.05), and index Freps (P < 0.05) significantly differed between APB and ADM. The differences in the dysfunction of motoneurons innervating APB and ADM are unique manifestations in ALS patients. The F-wave persistence (P = 0.002), index RN (P < 0.001), and index Freps (P < 0.001) in the APB seemed to differentiate ALS from the NCs more robustly than the ADM/APB Compound muscle action potential (CMAP) amplitude ratio. Thus, F-waves may reveal subclinical alterations in anterior horn cells, and may potentially help to distinguish ALS from mimic disorders.
  • Publisher: Switzerland: Frontiers Research Foundation
  • Language: English
  • Identifier: ISSN: 1662-5161
    EISSN: 1662-5161
    DOI: 10.3389/fnhum.2016.00099
    PMID: 27014030
  • Source: GFMER Free Medical Journals
    PubMed Central
    ROAD: Directory of Open Access Scholarly Resources
    ProQuest Central
    DOAJ Directory of Open Access Journals
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