Mar 3, 2015 · After assessment of insertional and spontaneous activity, the needle electromyography (EMG) examination moves on to the evaluation of motor unit action potentials (MUAPs). In a process similar to the analysis of spontaneous activity, MUAPs must be assessed for morphology (duration, amplitude, phases), stability, and firing characteristics.

Oct 17, 2012 · Pathologic processes of the peripheral nervous system (neurogenic processes) and of muscles (myopathic pathologies) can alter these aspects, leading to abnormal deviations in MUAP parameters; i.e., the EMG signal captures pathologic remodelling of the MUs caused by neuromuscular diseases.

Analysis of motor unit action potential (MUAP) morphology and recruitment pattern is the key element of needle EMG that helps establish the diagnosis of a myopathy. In myopathic processes, there is dropout or dysfunction of individual muscle fibers (see Fig. 1 ).

Mar 1, 2019 · After assessment of insertional and spontaneous activity, the needle electromyography (EMG) examination moves on to the evaluation of motor unit action potentials (MUAPs). In a process similar to the analysis of spontaneous activity, MUAPs must be assessed for morphology (duration, amplitude, phases), stability, and firing characteristics.

This study aims to develop and validate a novel motor unit action potential (MUAP)-based method for surface EMG decomposition, addressing the limitations of traditional blind source separation (BSS)-based techniques in computation complexity and motor unit (MU) tracking. Methods

Jun 2, 2021 · Nerve conduction studies and needle electromyography (EMG) are the most common electrophysiologic tests utilized to evaluate patients with sus-pected neuromuscular disorders. Both tests must be individualized, based on the clinical findings and differential diagnosis, and modified as the tests pro-ceed.

In the activation phase of an EMG, characteristics of the motor unit action potential (MUAP) are analyzed (referred to as the M-wave in Figure 3). MUAP analysis helps determine the presence of a disorder, whether it is neuropathic or myopathic, the time course of the disorder, and its severity.

muscle mass and these changes can be recorded and edited using electromyographic (EMG) devices. The representation of the changes generated by a MU is the so called motor unit action potential (MUAP). A MUAP waveform can be characterized by a number of parameters related to certain aspects of the structure and physiology of the MU (Figure 1).

In routine needle-electrode examination (ie, electromyography [EMG]) of voluntary muscle contraction, the electrodiagnostic consultant assesses the signature electrical signal generated by the...

Our simulation study indicates that the performance of template-matching methods for MUAP number estimation is mainly constrained by the MUAP superposition in the signal, and the maximum number of MUAPs allowed in the signal for a good estimation is determined by the duration of MUAPs.