2021 Workshop Handout Bundle-SFEMG and Measuring Jitter Using Concentric Needle- Massey/Sanders

SFEMG and Measuring Jitter Using Concentric Needle- Massey/Sanders

Pdf Summary

The AANEM Workshop on SFEMG and Measuring Jitter Using Concentric Needles, led by Dr. Donald Sanders, provides an overview of single fiber electromyography (SFEMG) and its applications in neuromuscular assessment. SFEMG is a selective technique that allows for the identification of action potentials (APs) from individual muscle fibers. This selectivity is achieved through small recording surfaces and the use of high pass filters. SFEMG allows for the measurement of two important features of the motor unit: fiber density (FD) and neuromuscular jitter. FD measures the local concentration of muscle fibers within the motor unit and is increased in neuropathies and some myopathies. Neuromuscular jitter, the variation in latency from stimulus to response, is increased in conditions such as myasthenia gravis (MG) and Lambert-Eaton myasthenic syndrome (LEMS). SFEMG can be used to identify abnormalities in neuromuscular transmission in various conditions including neuropathies and myopathies. Jitter measurements can be made using axonal stimulation or during voluntary muscle activation. The presentation emphasizes the importance of obtaining accurate and reliable SFEMG measurements, including the use of small CNEs for jitter analysis when SFEs are not available. The workshop also discusses specific findings in disorders such as MG and LEMS and provides reference values for jitter measurements in healthy controls using CNEs. Overall, this workshop provides valuable information on the use of SFEMG and jitter analysis in the evaluation of neuromuscular disorders.

Keywords

SFEMG

measuring jitter

concentric needles

neuromuscular assessment

action potentials

fiber density

neuromuscular jitter

neuropathies

myopathies

neuromuscular transmission