Magnetic resonance imaging urodynamics. Technique development and preliminary results

Area of Science:

• Medical Imaging
• Urology
• Pelvic Floor Disorders

Background:

• Genuine stress urinary incontinence (SUI) diagnosis relies on clinical assessment.
• Current urodynamic techniques provide pressure data but lack detailed anatomical visualization.

Purpose of the Study:

• To develop and assess a novel video urodynamic technique integrating magnetic resonance imaging (MRI).
• To evaluate the feasibility of MRI-based urodynamics for visualizing pelvic floor dynamics during voiding dysfunction assessments.

Main Methods:

• Six women with genuine SUI underwent synchronized multichannel urodynamic testing and real-time MRI.
• High-speed MRI (1.5 T) with fluoroscopic imaging captured pelvic floor compartment movement during Valsalva and coughing maneuvers at various bladder volumes.
• Data synchronization created a single, integrated video urodynamic examination.

Main Results:

• Dynamic MRI successfully visualized pelvic floor compartment movement correlated with intravesical and abdominal pressures.
• Urinary leakage was observed in 5 patients during straining.
• The Valsalva leak point pressure (VLPP) was determined, with a mean of 72.6 cm H2O.

Conclusions:

• The developed MRI video urodynamics technique is feasible for research applications.
• While clinically practical barriers exist for daily use, the method offers valuable insights into pelvic floor dynamics.
• This technique holds potential for advancing research in diagnosing and understanding urinary incontinence.