Anal manometry with microtransducer technique before and after restorative proctocolectomy. Sphincter function and...

Area of Science:

• Gastroenterology
• Colorectal Surgery
• Physiology

Background:

• Restorative proctocolectomy is a surgical option for ulcerative colitis and familial adenomatous polyposis.
• Sphincter function is crucial for fecal continence.
• Understanding the long-term functional changes after surgery is important for patient outcomes.

Purpose of the Study:

• To evaluate the long-term effects of restorative proctocolectomy on anal sphincter function using anal manometry.
• To identify factors influencing postoperative sphincter function and continence.

Main Methods:

• Anal manometry with a microtransducer technique was performed in 55 patients post-restorative proctocolectomy.
• Patients were followed for up to 24 months, with measurements taken preoperatively and at 12 and 24 months postoperatively.
• Parameters assessed included high-pressure zone dimensions, maximal squeeze pressure, and rectoanal inhibitory reflex.

Main Results:

• Sphincter function was severely impaired postoperatively, with significant reductions in high-pressure zone height, area, and length persisting up to 24 months.
• Maximal squeeze pressure recovered by 12 months.
• The rectoanal inhibitory reflex was frequently absent postoperatively.
• Higher preoperative resting pressure, fewer bowel movements, and longer deferral times correlated with higher resting tones at 12 months.
• No correlation was found between resting pressure and continence status.

Conclusions:

• Restorative proctocolectomy leads to significant and persistent impairment of anal sphincter function, particularly affecting the high-pressure zone.
• While some functional parameters like maximal squeeze pressure may recover, the rectoanal inhibitory reflex is often compromised.
• Preoperative factors may influence postoperative resting tone, but do not directly correlate with continence outcomes.