Effect of rectal distention on lower urinary tract function in children

Area of Science:

• Pediatric Urology
• Gastroenterology
• Neuroscience

Background:

• Lower urinary tract symptoms (LUTS) are common in children.
• The relationship between rectal function and bladder control is not fully understood.
• Constipation is often associated with LUTS in pediatric populations.

Purpose of the Study:

• To investigate the impact of rectal distention on lower urinary tract function in children.
• To determine if constipation influences the response of bladder function to rectal distention.
• To assess the predictability of bladder responses to rectal stimuli.

Main Methods:

• Children with and without constipation underwent standard urodynamics.
• Urodynamic parameters were measured during controlled rectal balloon distention and after deflation.
• Additional assessments included colonic transit time, anorectal manometry, and behavioral scales.

Main Results:

• Rectal distention altered urodynamic patterns in approximately 70% of children with LUTS.
• Responses to rectal distention were variable (inhibitory or stimulatory) and often unpredictable.
• Changes induced by rectal distention persisted or progressed after balloon deflation in nearly half of the cases.
• No significant differences in response were observed between children with and without constipation.
• Clinical features did not predict the bladder's response to rectal distention.

Conclusions:

• Rectal distention significantly affects bladder capacity, sensation, and overactivity in children with LUTS, irrespective of constipation status.
• The bladder's response to rectal distention is unpredictable and independent of baseline clinical and urodynamic findings.
• Current urodynamic assessments and management strategies for LUTS may overlook the significant impact of rectal distention, potentially leading to variable treatment outcomes.