How to define pathologic pelvic floor descent in MR defecography during defecation?

Area of Science:

• Pelvic floor imaging and diagnostics
• Gastroenterology and colorectal surgery
• Functional imaging techniques

Background:

• Pelvic floor disorders affect many women, impacting quality of life.
• Accurate assessment of pelvic floor descent is crucial for diagnosis and treatment.
• MR defecography (MRD) is an advanced imaging technique for evaluating pelvic floor function.

Purpose of the Study:

• To evaluate pelvic floor descent during straining and defecation using MR defecography (MRD).
• To compare pelvic floor descent in patients with pelvic floor disorders and healthy volunteers.
• To establish specific threshold values for diagnosing pathologic pelvic floor descent during defecation.

Main Methods:

• Twenty-two patients with obstructed defecation and 20 healthy volunteers underwent 3.0T MR defecography.
• Midsagittal T2-weighted images were analyzed for pelvic floor descent in anterior, middle, and posterior compartments.
• Receiver-operating characteristic (ROC) curves were used to determine cutoff values for pelvic floor descent.

Main Results:

• Pelvic floor descent was significantly greater during defecation than straining in both groups.
• Grading pelvic floor descent during defecation overestimated pathology in healthy volunteers.
• A cutoff value of 45 mm below the PCL during defecation identified pathologic posterior compartment (PC) descent with 15% false positives in healthy volunteers.

Conclusions:

• MRD measurements during straining and defecation can differentiate patients with pelvic floor dysfunction.
• Distinct cutoff values are necessary for assessing normal versus pathologic pelvic floor descent during straining and defecation phases.
• This study defines a specific cutoff for PC descent during defecation, improving diagnostic accuracy.