Spontaneous continuous motor unit single discharges.
axonal sprouting
jitter
motor unit hyperexcitability
needle electromyography
neuromyotonia
spontaneous activity
Journal
Muscle & nerve
ISSN: 1097-4598
Titre abrégé: Muscle Nerve
Pays: United States
ID NLM: 7803146
Informations de publication
Date de publication:
03 2020
03 2020
Historique:
received:
11
09
2019
revised:
17
12
2019
accepted:
20
12
2019
pubmed:
27
12
2019
medline:
11
4
2020
entrez:
27
12
2019
Statut:
ppublish
Résumé
Motor unit hyperexcitability (MUH) may become manifest in needle electromyography (EMG) recordings as fasciculation potentials, myokymic discharges, or neuromyotonic discharges. Here, we describe a further MUH phenomenon. Needle EMG recordings of the Neurology Hospital of Halle (Saale) stored in a video mode as .wav data between 2000 and 2015 were screened for spontaneous continuous motor unit single discharges (SCMUSD). We identified 23 video needle EMG waveforms from 14 patients with SCMUSD. The corresponding motor units discharged at a rate of about 6 H Z (6.3 ± 4.0; range, 1.3-18.1). The coefficient of variation of the discharge rate was 3.5% ± 1.7%. Neurogenic disorders were diagnosed in 12 patients, limb girdle muscle dystrophy was diagnosed in one patient, and stiff-limb syndrome was diagnosed in one patient. Spontaneous continuous motor unit single discharge, as described here, widens the spectrum of MUH phenomena.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
387-390Informations de copyright
© 2019 Wiley Periodicals, Inc.
Références
Auger RG. AAEM minimonograph #44: diseases associated with excess motor unit activity. Muscle Nerve. 1994;17:1250-1263.
Nogués MA, Stålberg E. Electrodiagnostic findings in syringomyelia. Muscle Nerve. 1999;22:1653-1659.
Gorassini MA, Knash ME, Harvey PJ, Bennett DJ, Yang JF. Role of motoneurons in the generation of muscle spasms after spinal cord injury. Brain. 2004;127(Pt 10):2247-2258.
Whaley NR, Rubin DI. Myokymic discharges in amyotrophic lateral sclerosis (ALS): a rare electrophysiologic finding? Muscle Nerve. 2010;41:107-109.
Albers JW, Allen AA, Bastron JA, et al. Limb myokymia. Muscle Nerve. 1981;4:494-504.
Levin KH, Lederman RJ, Wilborn AJ. Spectrum of EMG changes in radiation brachial plexopathy. Muscle Nerve. 1987;10:656.
Starling A, de Paula F, Silva H, Vainzof M, Zatz M. Calpainopathy: how broad is the spectrum of clinical variability? J Mol Neurosci. 2003;21:233-236.
Shim S, Ming GL. Roles of channels and receptors in the growth cone during PNS axonal regeneration. Exp Neurol. 2010;223:38-44.
Mottram CJ, Jakobi JM, Semmler JG, Enoka RM. Motor-unit activity differs with load type during a fatiguing contraction. J Neurophysiol. 2005;93:1381-1392.