High-resolution anorectal manometry and dynamic pelvic magnetic resonance imaging are complementary technologies

Area of Science:

• Gastroenterology
• Pelvic Floor Disorders
• Diagnostic Imaging

Background:

• Dynamic pelvic magnetic resonance imaging (DP-MRI) provides detailed structural and functional evaluation of pelvic organs during defecation.
• Limited availability of DP-MRI necessitates exploring predictive capabilities of standard anorectal testing.
• High-resolution anorectal manometry (HR-ARM) is a standard test for evaluating anorectal function.

Purpose of the Study:

• To determine if HR-ARM findings correlate with structural abnormalities identified by DP-MRI in patients with constipation.
• To assess the potential of HR-ARM to predict DP-MRI findings, thereby optimizing the use of DP-MRI.

Main Methods:

• Retrospective analysis of 23 female patients with constipation who underwent both HR-ARM and DP-MRI.
• Review of DP-MRI for posterior pelvic organ prolapse, rectocele > 3 cm, and rectal intussusception.
• Statistical analysis using Pearson's correlation, Student's t-test, and Fisher's exact test.

Main Results:

• Twenty of 23 patients had significant structural findings on DP-MRI, including pelvic organ prolapse and rectocele.
• Only intrarectal pressure on HR-ARM showed a weak correlation with rectocele size (r=0.46) and pelvic organ prolapse degree (r=0.48).
• Other HR-ARM parameters, including dyssynergy, did not significantly correlate with DP-MRI findings.

Conclusions:

• HR-ARM findings do not correlate with structural pelvic defects visualized on DP-MRI.
• DP-MRI and HR-ARM offer complementary, rather than overlapping, information in the assessment of defecatory dysfunction.
• Further research may be needed to identify predictors of DP-MRI findings in constipation patients.