Home Urodynamic Pressures and Volume Measurement for the Neurogenic Bladder: Initial Validation Study

Area of Science:

• Urology
• Pediatric Nephrology

Background:

• Patients with spina bifida often experience high intravesical pressures, increasing the risk of renal damage.
• Clean intermittent catheterization (CIC) is a common management strategy, but monitoring bladder pressures at home is crucial.

Purpose of the Study:

• To evaluate the efficacy of a bladder pressure/volume diary in identifying patients at risk for elevated intravesical pressures.
• To determine if home-based pressure measurements can reliably predict urodynamic findings.

Main Methods:

• Prospective collection of clinical, urodynamic, and bladder pressure/volume diary data in 30 spina bifida patients on CIC.
• Home intravesical pressures measured via ruler-based manometry before leakage or drainage.
• Comparison of home measurements with urodynamic findings, defining increased pressure as >30 cm water.

Main Results:

• Home pressures at maximal CIC volume (AUC 0.93) and mean diary pressures (AUC 0.87) reliably predicted urodynamic pressures >30 cm water.
• Home pressures <20 cm water at maximal CIC volume showed 100% sensitivity and 80% specificity for normal urodynamic pressures (<30 cm water).

Conclusions:

• Home manometry <20 cm water is a reliable indicator of safe bladder pressures.
• A bladder pressure/volume diary is a feasible tool for home monitoring, potentially reducing the need for urodynamics.
• This diary can help identify patients who may benefit from formal urodynamic testing.