Assessment of functional defecation disorders using anorectal manometry

Area of Science:

• Gastroenterology
• Physiology
• Diagnostic Accuracy

Background:

• Functional constipation (FC) and functional defecation disorder (FDD) are common anorectal conditions.
• Accurate diagnosis is crucial for effective treatment.

Purpose of the Study:

• To assess the diagnostic accuracy of anorectal manometry (ARM) in distinguishing between nonconstipated (NC) and FC subjects.
• To evaluate ARM's ability to differentiate FC patients with and without FDD.

Main Methods:

• ARM was performed on female patients categorized into NC, FC without FDD (-FDD), and FC with FDD (+FDD) groups.
• Interpretation included absolute pressures, pattern classification, and quantification of pressure changes during attempted defecation.

Main Results:

• Pattern classification showed limited discriminating power for FC and FDD.
• The Manometric Defecation Index (MDI) was significantly different between FC subgroups with and without FDD.
• Conventional pressure measurements showed minimal differences between groups.

Conclusions:

• The Manometric Defecation Index (MDI) is a valuable parameter for diagnosing FDD in FC patients.
• Other ARM parameters, including pattern classification, have questionable diagnostic utility for FDD.