Hence, muscle fiber density recorded by single fiber EMG is larger in the paretic limb compared to the contralateral limb ( Cruz Martinez et al., 1982 Lukács et al., 2009). However, some of the denervated fibers are likely reinnervated by collateral sprouting from intact motor units, a demonstration of motor unit remodeling. At the same time, there is on-going denervation based on the presence of positive sharp waves and fibrillation potentials recorded by concentric needle EMG ( Spaans and Wilts, 1982 Benecke et al., 1983 Brown and Snow, 1990 Dattola et al., 1993 Kouzi et al., 2014). During the initial weeks to months following stroke, there is electrophysiological evidence of motor unit loss in upper and lower muscles of the paretic limb ( McComas et al., 1971 Hara et al., 2004). Motor units are remodeled following a cerebrovascular lesion. However, it may also be related to secondary changes in the peripheral motor apparatus, both adaptive and maladaptive ( Colebatch and Gandevia, 1989 Klein et al., 2010 Zhou et al., 2013). The extent of hemiparesis varies from patient to patient, often presumed to reflect the severity and location of the lesion. The loss of hand function is particularly devastating because everyday tasks such as dressing or carrying parcels may be disrupted ( Ward, 2011 Kamper et al., 2014 Li et al., 2014a Lu et al., 2017). Hemiparesis, the reduction in movement capability and strength in the limb opposite the brain lesion (i.e., paretic limb), is a lasting outcome in people who have suffered a cerebrovascular stroke ( Colebatch and Gandevia, 1989 Jorgensen et al., 1995a, b Li, 2017). The results provide further evidence that motor units are remodeled after stroke, possibly in response to a loss of motoneurons. Both single fiber and concentric needle EMG recordings may be necessary to better understand muscle changes after stroke, which is important for development of appropriate rehabilitation strategies. Single fiber EMG appears more sensitive than concentric needle EMG to reflect electrophysiological changes in motor units after stroke. However, sprouting might be insufficient to result in a statistically significant change in the concentric needle MUAP parameters. The increase in FD suggests motor units of the paretic FDI have enlarged due to collateral reinnervation. 1.1 ± 0.3) ( P > 0.18), nor was there a significant difference in single fiber EMG recorded jitter (37.0 ± 9.6 vs. There was no statistically significant difference between the paretic and contralateral sides in most concentric needle motor unit action potential (MUAP) parameters, such as amplitude (768.7 ± 441.7 vs. A significant increase in mean fiber density (FD) was found in the paretic muscle compared with the contralateral side based on single fiber EMG (1.6 ± 0.2 vs. The first dorsal interosseous (FDI) muscle was studied bilaterally in eleven hemiparetic stroke subjects.
NATUS ULTRAPRO S100 SOFTWARE
Developed in collaboration with physicians and technologists, the next generation UltraPro S100 builds on the success of the VikingQuest and previous UltraPro models, combining user-friendly controls and workflows with superior signal quality to help perform neuromuscular assessments with a greater level of certainty.ĭesigned with the user in mind, the UltraPro S100’s enhancements in hardware and software make it easier for physicians and technologists to get better data when testing for common muscle and nerve disorders - and give patients better answers.The purpose of this study was to better understand changes in motor unit electrophysiological properties in people with chronic stroke based on concentric needle electromyography (EMG) and single fiber EMG recordings.
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