The influence of bladder filling on anorectal function

Area of Science:

• Urogynecology
• Pelvic Floor Physiology
• Gastroenterology

Background:

• Simultaneous evaluation of bladder and anorectal function is crucial for understanding pelvic floor disorders.
• Existing research has not fully elucidated the relationship between bladder filling and anorectal manometry.
• Urinary symptoms can be associated with altered pelvic floor function.

Purpose of the Study:

• To develop and validate a technique for simultaneous assessment of bladder and anorectal function.
• To investigate the impact of bladder filling on anal sphincter resting pressure, anal sphincter squeeze pressure, and rectal sensation.
• To determine if changes in bladder volume affect anorectal physiological parameters.

Main Methods:

• A pilot study involving ten female patients with urinary symptoms undergoing pelvic floor assessment.
• Baseline urodynamic testing followed by anorectal manometry with an empty bladder.
• Bladder filling with saline while continuously monitoring anal sphincter resting pressure and intermittently measuring squeeze pressure and rectal sensation at set intervals.

Main Results:

• No statistically significant changes were observed in anal sphincter resting pressure (P = 0.92) during bladder filling.
• Anal sphincter squeeze pressure also showed no significant alteration (P = 0.86) with increasing bladder volume.
• Rectal sensation, including first sensation and urgency, did not change significantly (P = 0.958 and P = 0.07, respectively) with bladder distension.

Conclusions:

• Bladder filling does not appear to influence anorectal function under normal physiological conditions.
• The findings suggest independent functioning of the bladder and anorectal components of the pelvic floor.
• This study provides evidence that simultaneous urodynamic and anorectal manometry can be performed without confounding effects of bladder volume on anorectal parameters.