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Related Experiment Videos

Urethral pressure changes during voiding.

I Miyagawa

    The Tohoku Journal of Experimental Medicine
    |April 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    During voiding, intraurethral pressure in the external sphincter zone decreases with reduced external urethral sphincter electromyographic activity in normal subjects. This study monitored pressure changes during the voiding process.

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    Area of Science:

    • Urology
    • Physiology

    Background:

    • Understanding the physiological mechanisms of normal voiding is crucial for diagnosing and treating lower urinary tract dysfunction.
    • The external urethral sphincter plays a key role in maintaining continence and coordinating the voiding process.

    Purpose of the Study:

    • To investigate intraurethral pressure dynamics in the external sphincter zone during voluntary voiding in healthy individuals.
    • To correlate urethral pressure changes with electromyographic activity of the external urethral sphincter.

    Main Methods:

    • Utilized a specially constructed double lumen urethral catheter for precise pressure measurements.
    • Recorded intraurethral pressure changes in the external sphincter zone during voiding in three healthy male subjects.
    • Monitored electromyographic (EMG) activity of the external urethral sphincter concurrently.

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    Main Results:

    • Observed a simultaneous drop in intraurethral pressure within the external sphincter zone concurrent with decreased EMG activity of the external urethral sphincter during straining to void.
    • Confirmed stable catheter positioning throughout the urethrometrography procedure, ensuring reliable data acquisition.
    • Demonstrated a coordinated relaxation of the external urethral sphincter and a pressure decrease in its zone during the initiation of voiding.

    Conclusions:

    • The findings support a coordinated neuromuscular control mechanism for normal voiding, involving sphincter relaxation and pressure reduction.
    • This study provides objective physiological data on the interplay between urethral pressure and external sphincter activity during voiding.
    • The methodology established can be applied to further investigate voiding dysfunction in various patient populations.