scholarly journals Recurrence Quantification Analysis of F-Waves and the Evaluation of Neuropathies

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Morris A. Fisher ◽  
Vijaya K. Patil ◽  
Charles L. Webber
Keyword(s):  
Compound Muscle Action Potential ◽  
Diabetic Neuropathies ◽  
The Other ◽  
Nonlinear Method ◽  
Abductor Hallucis ◽  
Muscle Action Potential ◽  
Abductor Hallucis Muscle ◽  
Quantification Analysis ◽  
Unique Method ◽  
F Wave

Electrodiagnostic (EDX) patterns of neuropathic dysfunction have been based on axonal/demyelinating criteria requiring prior assumptions. This has not produced classifications of desired sensitivity or specificity. Furthermore, standard nerve conduction studies have limited reproducibility. New methodologies in EDX seem important. Recurrent Quantification Analysis (RQA) is a nonlinear method for examining patterns of recurrence. RQA might provide a unique method for the EDX evaluation of neuropathies. RQA was used to analyze F-wave recordings from the abductor hallucis muscle in 61 patients with neuropathies. Twenty-nine of these patients had diabetes as the sole cause of their neuropathies. In the other 32 patients, the etiologies of the neuropathies were diverse. Commonly used EDX variables were also recorded. RQA data could separate the 29 patients with diabetic neuropathies from the other 32 patients (P<0.009). Statistically significant differences in two EDX variables were also present: compound muscle action potential amplitudes (P<0.007) and F-wave persistence (P<0.001). RQA analysis of F-waves seemed able to distinguish diabetic neuropathies from the other neuropathies studied, and this separation was associated with specific physiological abnormalities. This study would therefore support the idea that RQA of F-waves can distinguish between types of neuropathic dysfunction based on EDX data alone without prior assumptions.

Activity-dependent changes in intrinsic excitability of human spinal motoneurones produced by natural activity

2012 ◽  
Vol 108 (9) ◽  
pp. 2473-2480 ◽  
Author(s):  
Alessandro Rossi ◽  
Simone Rossi ◽  
Federica Ginanneschi
Keyword(s):  
Action Potential ◽  
Compound Muscle Action Potential ◽  
Intrinsic Excitability ◽  
Dependent Manner ◽  
Natural Activity ◽  
Muscle Action Potential ◽  
Abductor Digiti Minimi ◽  
F Wave ◽  
Spinal Motoneurones ◽  
Activity Dependent

The current study was designed to evaluate activity-dependent changes intrinsic to the spinal motoneurones (MNs) associated with sustained contractions. The excitability of spinal MNs (reflected by the antidromically evoked F-wave) innervating the abductor digiti minimi muscle (ADM) was measured in 12 healthy subjects following maximum voluntary contractions (MVCs) of ADM lasting 5 s, 15 s, 30 s, and 60 s. Upon cessation of the contractions, F-waves showed a depression, which increased in depth and duration with increasing duration of contraction. Following a 5-s contraction, there was a 20% decrease, which waned in 2 min, whereas a 60-s contraction produced a 40% decrease and waned in over 15 min. The changes in excitability of peripheral motor axons produced by the MVCs were measured by recording an ADM compound muscle action potential (CMAP) of ∼50% of maximum to a constant ulnar nerve electrical stimulation. On cessation of the contractions, there was a prominent decrease in size of the CMAP: following a 5-s MVC, it produced a 10% decrease in the size of the test CMAP, which recovered in 2 min, whereas following a 60-s MVC, it produced a 30% decrease, which recovered in over 15 min. Statistical analysis (correntropy) showed a high-order mutual dependence between F-wave and CMAP, and both were significantly dependent on MVC duration. Because of the parallel excitability changes in peripheral axons and spinal MNs, our interpretation is that intrinsic excitability of the axon initial segment (i.e., where the action potential is generated) and peripheral axon segments changed in a similar, activity-dependent manner.

scholarly journals The F waves study in young healthy individuals

2018 ◽  
Vol 6 (5) ◽  
pp. 1628
Author(s):  
Subedi P. ◽  
Limbu N. ◽  
Thakur D. ◽  
Khadka R. ◽  
Gupta S.
Keyword(s):  
Early Stage ◽  
Compound Muscle Action Potential ◽  
Motor Nerve ◽  
Descriptive Analysis ◽  
Healthy Individuals ◽  
Anthropometric Parameters ◽  
Muscle Action Potential ◽  
Supramaximal Stimulation ◽  
F Wave ◽  
Stimulation Of

Background: The F wave is a CMAP (compound muscle action potential) evoked by a supramaximal stimulation of a motor nerve. F waves are particularly useful for the diagnoses of polyneuropathies at an early stage and proximal nerve lesions.Methods: Healthy males (n=64) and females (n=26) medical students of BPKIHS with age 20 to 24 years were enrolled. Anthropometric parameters; F wave latencies, persistence and chronodispersion of bilateral median, ulnar and tibial nerves were recorded in Neurophysiology Lab II of BPKIHS. Descriptive analysis was done.Results: Mean age, height and weight of the subjects were 21.64±1.19 years, 165.61±5.4cms and 64.07±5.5kg. Mean minimum F wave latencies (ms) of right median, ulnar and tibial nerves were 24.09±1.95, 24.02±1.76, 44.34±3.02 while on the left side were 23.92±1.96, 24.11±1.92, 44.07±2.83 respectively. F persistence was above 80%. F chronodispersion (ms) for right and left median, ulnar and tibial nerves were 2.77±0.70, 2.79±0.65, 2.71±0.67, 2.80±0.56, 3.48±0.73 and 3.45±0.64 respectively.Conclusions: Maximum and minimum F wave latencies, F chronodispersion and F persistence were derived for both sexes in an age group of 20-24 years.

Nerve physiology

2017 ◽  
Author(s):  
Matthew Pitt
Keyword(s):  
Action Potential ◽  
Normative Data ◽  
Axonal Degeneration ◽  
Compound Muscle Action Potential ◽  
Sensory Nerve ◽  
Muscle Action ◽  
Nerve Fibres ◽  
Muscle Action Potential ◽  
Motor Nerves ◽  
F Wave

The chapter begins with a description of the normal findings in healthy sensory and motor nerves. The distribution of nerve fibres by diameter in the sensory nerve and its effect on the recorded action potential is outlined. The method by which velocity and compound muscle action potential are derived from motor stimulation follows. H-reflex studies and F-wave identification are described. A section on the strategies used for nerve conduction study in children and the nerves chosen for examination leads on to a description of the difficulties of deriving normative data in children. Next follows a detailed description of the findings in both sensory and motor nerves in demyelination where a distinction between patchy and homogenous demyelination is possible. An analysis of the nerve findings in axonal degeneration is then presented. The chapter finishes with a discussion of the variability in nerve testing.

scholarly journals Pseudomyopathic Changes in Needle Electromyography in Lambert-Eaton Myasthenic Syndrome

2013 ◽  
Vol 2013 ◽  
pp. 1-2 ◽  
Author(s):  
Teppei Komatsu ◽  
Kota Bokuda ◽  
Toshio Shimizu ◽  
Tetsuo Komori ◽  
Reiji Koide
Keyword(s):  
Nerve Stimulation ◽  
Compound Muscle Action Potential ◽  
The Other ◽  
Motor Unit Potential ◽  
Muscle Action ◽  
Repetitive Nerve Stimulation ◽  
Needle Electromyography ◽  
Muscle Action Potential ◽  
Myasthenic Syndrome ◽  
Myopathic Changes

Lambert-Eaton myasthenic syndrome (LEMS) is a rare presynaptic disorder of the neuromuscular junction in association with cancer and subsequently in cases in which no neoplasm has been detected (O’Neill et al., 1988). The diagnosis of LEMS is based on the combination of fluctuating muscle weakness, diminished or absent reflexes, and a more than 60% increment of compound muscle action potential (CMAP) amplitude after brief exercise or 50 Hz stimulation for 1 s in a repetitive nerve stimulation (RNS) test (Oh et al., 2005). On the other hand, needle electromyography (EMG) findings related to LEMS have not been well described. Here, we report a case of LEMS, which showed apparent myopathic changes in needle EMG findings. Furthermore, we retrospectively examined the needle EMG findings in 8 patients with LEMS. In six of the 8 patients, the EMG findings showed myopathy-like findings. Although the findings of needle EMG indicated myopathic changes at a glance, the motor unit potential (MUP) returned to normal after a sustained strong muscle contraction. We propose the name “pseudomyopathic changes” for this phenomenon.

scholarly journals Impact of stimulus duration on motor unit thresholds and alternation in compound muscle action potential scans

2020 ◽  
Author(s):  
Boudewijn T.H.M. Sleutjes ◽  
Janna Ruisch ◽  
Thijs E. Nassi ◽  
Jan R. Buitenweg ◽  
Leonard J. van Schelven ◽  
...  
Keyword(s):  
Action Potential ◽  
Motor Unit ◽  
Stimulus Duration ◽  
Compound Muscle Action Potential ◽  
Muscle Action ◽  
Muscle Action Potential

Determination of the best electrode position for recording of the diaphragm compound muscle action potential

2009 ◽  
Vol 40 (1) ◽  
pp. 37-41 ◽  
Author(s):  
Annie Dionne ◽  
Anthony Parkes ◽  
Beata Engler ◽  
Bradley V. Watson ◽  
Michael W. Nicolle
Keyword(s):  
Action Potential ◽  
Compound Muscle Action Potential ◽  
Electrode Position ◽  
Muscle Action ◽  
Muscle Action Potential

scholarly journals Hypertrophy of the abductor hallucis muscle: A case report and review of the literature

2017 ◽  
Vol 5 ◽  
pp. 2050313X1772763 ◽  
Author(s):  
Toshinori Kurashige
Keyword(s):  
Rare Case ◽  
Muscle Hypertrophy ◽  
Pathological Condition ◽  
Rare Condition ◽  
Review Of The Literature ◽  
Resonance Imaging ◽  
Abductor Hallucis ◽  
Medial Plantar Nerve ◽  
Abductor Hallucis Muscle ◽  
Entrapment Syndromes

Objectives: Muscle hypertrophy is a relatively rare condition that may cause nerve entrapment syndromes. We report the case of a 14-year-old girl with unilateral hypertrophy of the abductor hallucis muscle with entrapment of the medial plantar nerve and review the literature. Methods: Computed tomography and magnetic resonance imaging revealed unilateral hypertrophy of the abductor hallucis muscle. Results: Two injections of steroid and lidocaine at the point of tenderness resulted in resolution of the pain. Conclusions: We report a rare case of hypertrophy of the abductor hallucis muscle considered with entrapment of the medial plantar nerve. Treatment of this condition should be selected according to the pathological condition of each patient.

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