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Related Experiment Videos

Needle electromyography: its effect on serum creatine phosphokinase activity.

S A Chrissian, W C Stolov, T Hongladarom

    Archives of Physical Medicine and Rehabilitation
    |March 1, 1976
    PubMed
    Summary

    Needle electromyography (EMG) causes a temporary, mild increase in serum creatine phosphokinase (CPK) levels, peaking at 6 hours post-procedure. This effect is generally not significant enough to cause false-positive results in healthy individuals.

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    Area of Science:

    • Neurology
    • Clinical Biochemistry

    Background:

    • Serum creatine phosphokinase (CPK) levels are important diagnostic markers.
    • The impact of needle electromyography (EMG) on CPK levels is not fully understood.
    • Elevated CPK can indicate muscle damage, but confounding factors require clarification.

    Purpose of the Study:

    • To investigate the effect of needle electromyography (EMG) on serum creatine phosphokinase (CPK) levels.
    • To determine the time course and magnitude of CPK changes following EMG.
    • To assess the potential for EMG to cause false-positive CPK elevations.

    Main Methods:

    • Serum CPK levels were measured serially before and after needle EMG in healthy individuals and patients with low back pain.
    • Participants remained on total bed rest during the study period.

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  • Adjustments were made for body weight and needle insertion count to account for dilution and trauma.

    • Main Results:

    • Serum CPK levels showed a mean peak elevation of 1.5 times baseline at 6 hours post-EMG.
    • CPK levels returned to baseline within 48 hours.
    • Only one patient, with pre-existing muscle abnormalities, had a CPK level exceeding the normal range.

    Conclusions:

    • Needle EMG alone is unlikely to cause a significant or false-positive elevation of serum CPK in healthy individuals.
    • The observed CPK changes are transient and comparable to post-exercise effects.
    • Careful consideration of multiple factors, including EMG, exercise, and denervation, is crucial in interpreting CPK levels for myopathy diagnosis.