Functional brainstem changes in response to bladder function alteration elicited by surgical reduction in bladder...

Area of Science:

• Neuroscience
• Urology
• Physiology

Background:

• Previous research indicated a link between bladder issues and brain arousal in children with enuresis.
• This suggests a connection between bladder and brainstem dysfunction.

Purpose of the Study:

• To investigate brainstem functional changes in response to altered bladder function using an animal model.
• To characterize the relationship between bladder dysfunction and brainstem activity.

Main Methods:

• Surgical bladder volume reduction was performed on adult male New Zealand rabbits.
• Conventional fill cystometry and functional magnetic resonance imaging (fMRI) were used to assess bladder function and brainstem activation.
• Brainstem activation was measured during bladder filling to 70% capacity.

Main Results:

• Animals with reduced bladder volume exhibited voiding dysfunction, including increased detrusor pressure and decreased bladder volume.
• fMRI revealed activation in the ventrolateral periaqueductal gray and dorsolateral pons in response to bladder distention.
• Activation in the ventrolateral periaqueductal gray was significantly reduced in the reduced bladder group compared to controls.

Conclusions:

• Bladder dysfunction can lead to functional changes in brainstem micturition centers.
• Deactivation of the ventrolateral periaqueductal gray during bladder distention suggests its involvement in bladder dysfunction biofeedback.