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Related Experiment Videos

Flow evaluation and simultaneous external sphincter electromyography in clinical urodynamics

D M Barrett, A J Wein

    The Journal of Urology
    |April 1, 1981
    PubMed
    Summary

    Flow electromyography reliably assesses voiding. External sphincter dyssynergia is rare, suggesting it may be overdiagnosed, especially in women who often strain during urination.

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    Area of Science:

    • Urology
    • Neuroscience
    • Medical Engineering

    Background:

    • Urodynamic evaluation is crucial for diagnosing lower urinary tract dysfunction.
    • External sphincter electromyography (EMG) assesses striated muscle activity during voiding.
    • Previous studies have suggested a higher prevalence of external sphincter dyssynergia.

    Purpose of the Study:

    • To evaluate the reliability and clinical utility of combined uroflowmetry and external sphincter electromyography (fEMG).
    • To investigate the behavior of the external striated muscle sphincter during the voiding process.
    • To determine the actual prevalence of external sphincter dyssynergia in patients undergoing urodynamic studies.

    Main Methods:

    • Over 200 patients underwent combined uroflowmetry and perianal surface EMG.

    Related Experiment Videos

  • Pediatric electrocardiographic electrodes monitored skeletal muscle activity during voiding.
  • Voiding data was collected using a standard load-cell uroflowmeter.

    • Main Results:

    • Flow electromyography (fEMG) was found to be reliable and easy to perform.
    • Normal voiding is characterized by reduced striated muscle EMG activity.
    • External sphincter dyssynergia is rare in patients without neurological disease; straining during voiding, common in women, increases EMG activity but typically does not impede voiding.
    • Results suggest external sphincter dyssynergia may be overdiagnosed.

    Conclusions:

    • Flow electromyography is a valuable, reliable tool for assessing external sphincter function during urodynamic evaluations.
    • The study indicates that external sphincter dyssynergia is less common than previously thought.
    • Understanding voiding mechanics, including straining, is essential for accurate urodynamic interpretation.