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Related Experiment Videos

Diffuse abnormal electromyographic insertional activity: a preliminary report.

D O Wiechers, E W Johnson

    Archives of Physical Medicine and Rehabilitation
    |September 1, 1979
    PubMed
    Summary

    This study identified provoked positive sharp waves during electromyography (EMG) in patients with normal EMG findings. This unique muscle electrical activity appears to be inherited in an autosomal dominant pattern.

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    Area of Science:

    • Neurology
    • Clinical Electrophysiology

    Background:

    • Electromyography (EMG) is crucial for diagnosing neuromuscular disorders.
    • Normal EMG findings typically exclude significant myopathy or neuropathy.
    • Unexplained EMG abnormalities require further investigation.

    Purpose of the Study:

    • To characterize a unique EMG finding of provoked positive sharp waves in patients with otherwise normal EMG results.
    • To investigate the clinical and genetic basis of this observed phenomenon.

    Main Methods:

    • Electromyography (EMG) including needle electrode insertion.
    • Clinical evaluations for neuromuscular disorders, metabolic abnormalities, and carcinomas.
    • Muscle biopsy with histochemical analysis.
    • Single-fiber EMG and nerve conduction studies.

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  • Family history assessment for inheritance patterns.

    • Main Results:

    • Ten patients presented with normal EMG, except for positive sharp waves provoked by needle insertion.
    • No fibrillation potentials, fasciculations, or abnormalities in motor unit action potentials were observed.
    • Nerve conduction, repetitive stimulation, and single-fiber EMG studies were normal.
    • Muscle biopsies were normal; clinical evaluations ruled out other causes.
    • The abnormality was familial, suggesting autosomal dominant inheritance.

    Conclusions:

    • Provoked positive sharp waves can occur in patients with otherwise normal EMG.
    • This finding may represent a distinct, heritable neuromuscular trait.
    • Further research is needed to understand the underlying mechanisms and clinical significance.