Anorectal myectomy for outlet obstruction.

Area of Science:

• Gastroenterology
• Colorectal Surgery

Background:

• Chronic constipation associated with outlet obstruction affects many patients.
• Anorectal myectomy is a surgical option for refractory cases.
• Histological evidence of aganglionosis was present in some patients.

Purpose of the Study:

• To evaluate the efficacy of anorectal myectomy in patients with chronic constipation and outlet obstruction.
• To determine the physiological changes associated with successful anorectal myectomy.
• To identify factors predicting successful surgical outcomes.

Main Methods:

• Retrospective analysis of 29 patients undergoing anorectal myectomy for chronic constipation.
• Assessment of spontaneous defecation frequency before and after surgery.
• Measurement of anorectal manometry parameters including maximum resting anal pressure, squeeze pressures, and high-pressure zone length.

Main Results:

• 62% of patients (18/29) achieved good results with spontaneous defecation >3 times/week post-surgery.
• A significant fall in maximum resting anal pressure was observed in patients with good outcomes.
• No significant changes were noted in squeeze pressures, high-pressure zone length, rectal sensation, or anorectal angle.

Conclusions:

• Anorectal myectomy can be an effective treatment for chronic constipation due to outlet obstruction.
• The therapeutic benefit appears to be primarily related to the reduction in resting and canal pressures.
• Further research may elucidate predictive factors for surgical success.