Complex Repetitive Discharges: A Sign of Motor Axonal Reinnervation?

Autor: Posa A; Department of Neurology, Martin-Luther-University Hospital Halle-Wittenberg, 06108 Halle, Germany., Niśkiewicz I; Department of Neurology, Martin-Luther-University Hospital Halle-Wittenberg, 06108 Halle, Germany., Emmer A; Department of Neurology, Martin-Luther-University Hospital Halle-Wittenberg, 06108 Halle, Germany., Hanisch F; Department of Neurology, Martin-Luther-University Hospital Halle-Wittenberg, 06108 Halle, Germany., Kornhuber ME; Department of Neurology, Martin-Luther-University Hospital Halle-Wittenberg, 06108 Halle, Germany.
Jazyk: angličtina
Zdroj: Brain sciences [Brain Sci] 2020 Jun 05; Vol. 10 (6). Date of Electronic Publication: 2020 Jun 05.
DOI: 10.3390/brainsci10060349
Abstrakt: Complex repetitive discharges (CRDs) are poorly understood phenomena in needle electromyography (EMG) recordings. The data presented here suggest that CRDs may mainly be a sign of motor unit reinnervation. EMG "video" data of 108 CRDs from neurogenic (ND, n = 39) and myogenic (MD, n = 14) disorders were retrospectively analyzed for cycle duration, potential-free time intervals, spike components (SC), maximum amplitudes, blockade, and increased jitter. CRD-SC in ND disorders (9.3 ± 7.8) outnumbered those in MD disorders (6.3 ± 6.2). The CRD cycle duration was correlated with SC and silent periods ( p each < 0.000001). Blockade was observed in 36% and increased jitter in 27% of the CRDs. A higher number of CRD-SC in ND vs. MD fits the known differences in motor unit dimensions. Blockade and increased jitter are known features of diseased neuromuscular junctions, such as during reinnervation. The SC patterns of single CRD cycles resemble reinnervation potentials. Thus, CRDs may result from myo-axonal re-excitation in sprouting motor units. The purpose of this investigation was to better understand the circumstances under which CRDs may occur and eventually to contribute to the understanding of their pathogenesis.
Databáze: MEDLINE
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