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Interaction of the Bezold-Jarisch reflex with the urinary bladder function.

I Rocha1, E I de Oliveira, K M Spyer

  • 1Instituto de Fisiologia, Faculdade de Medicina de Lisboa.

Revista Portuguesa De Cardiologia : Orgao Oficial Da Sociedade Portuguesa De Cardiologia = Portuguese Journal of Cardiology : an Official Journal of the Portuguese Society of Cardiology
|December 29, 2000
PubMed
Summary

The Bezold-Jarisch reflex, triggered by cardiac nerve stimulation, influences bladder activity. This reflex causes changes in pelvic nerve activity, leading to bladder contractions and increased pressure.

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Area of Science:

  • Neuroscience
  • Cardiovascular Physiology
  • Urology

Background:

  • The Bezold-Jarisch reflex increases vagal (parasympathetic) efferent discharge to the heart.
  • Micturition involves increased parasympathetic activity to the bladder (pelvic nerve activity), coinciding with bladder contractions.
  • Central nervous system regions modulating pelvic nerve activity also affect cardiovascular variables, with known neuronal connections between these areas.

Purpose of the Study:

  • To investigate if the Bezold-Jarisch reflex causes simultaneous changes in pelvic nerve activity.
  • To explore the link between cardiac reflexes and bladder function.

Main Methods:

  • Experiments were conducted on anesthetized Wistar female rats.
  • Measurements included arterial blood pressure, ECG heart rate, urinary bladder pressure, and pelvic nerve activity.

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Main Results:

  • Veratridine stimulation of cardiac chemosensitive nerve endings decreased arterial blood pressure and heart rate.
  • Simultaneously, pelvic nerve activity changed, preceding increased urinary bladder pressure and contractions.
  • Control injections of saline did not affect cardiovascular variables or pelvic nerve activity, confirming the reflex origin.

Conclusions:

  • Cardiac afferents play a significant role in modulating bladder contractions.
  • The integration and functional significance of these cardiac-bladder interactions require further elucidation.
  • This finding may help understand the association between urinary urgency and cardiac events like myocardial infarction.