An experimental study on the pathophysiology of rectal prolapse

Area of Science:

• Gastroenterology
• Surgical Research
• Animal Models

Background:

• Pelvic floor muscle weakness is a common hypothesis for rectal prolapse, but it doesn't explain incidence in nulliparous females or males.
• Existing theories fail to account for the full spectrum of rectal prolapse cases.

Purpose of the Study:

• To investigate the role of rectal redundancy in the pathophysiology of rectal prolapse.
• To evaluate if rectal mobilization can induce rectal prolapse in an animal model.

Main Methods:

• Nineteen female Sprague Dawley rats were divided into rectal mobilization (n=9) and sham-operated control (n=10) groups.
• Rectal mobilization involved soft dissection to create a redundant rectum.
• The primary outcome measured was the incidence of rectal prolapse post-mobilization.

Main Results:

• Rectal prolapse occurred in 44% of rats in the rectal mobilization group, compared to 0% in the control group (p=0.006).
• The study successfully induced rectal prolapse through rectal mobilization.

Conclusions:

• Rectal redundancy is a significant factor in rectal prolapse pathophysiology.
• This finding challenges the sole reliance on pelvic floor muscle weakness as an explanation for rectal prolapse.