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Related Experiment Videos

Electromyographic and pressure studies in the canine bladder

R P Beck, E E Daniel, P Fimper

    American Journal of Obstetrics and Gynecology
    |July 1, 1976
    PubMed
    Summary

    Dogs unable to urinate despite full bladders show bladder neck funneling is key. Coordinated electrical activity in the bladder neck and urethra signals effective voiding, unlike uncoordinated activity.

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    Area of Science:

    • Urology
    • Veterinary Medicine
    • Physiology

    Background:

    • Bladder dysfunction can impair voiding in dogs.
    • Understanding the physiological mechanisms of micturition is crucial for diagnosing and treating urinary issues.

    Purpose of the Study:

    • To investigate the relationship between bladder neck funneling, detrusor pressure, and electrical activity during canine micturition.
    • To differentiate the electrical activity patterns associated with coordinated versus uncoordinated voiding in dogs.

    Main Methods:

    • Electromyography was used to record electrical activity in the bladder neck, upper urethra, and bladder fundus.
    • Bladder pressure and volume were monitored during induced voiding attempts.
    • Parasympathomimetic drugs were administered to assess their effect on voiding.

    Main Results:

    • Dogs could not void until bladder neck funneling occurred, even with increased bladder volume or parasympathomimetic drug administration.
    • Minimal pressure rise preceded micturition.
    • Coordinated voiding correlated with simultaneous electrical activity in the upper urethra and bladder neck (with predominant activity in the bladder neck).
    • Uncoordinated voiding showed electrical activity in the bladder fundus, bladder neck, and upper urethra.

    Conclusions:

    • Bladder neck funneling is a prerequisite for voiding in dogs.
    • Specific patterns of electrical activity in the bladder neck and urethra are indicative of coordinated and effective micturition.
    • These findings provide insights into the neurophysiological control of canine voiding.

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