Is it time to reconsider how we document pediatric uroflow studies?: A study from the SPU Voiding Dysfunction task...

Area of Science:

• Pediatric Urology
• Diagnostic Imaging
• Medical Device Technology

Background:

• Uroflowmetry is crucial for diagnosing and monitoring lower urinary tract disorders.
• Standardized normal values for pediatric uroflowmetry are lacking, hindering clinical interpretation.
• Current curve pattern analysis relies heavily on subjective physician discretion.

Purpose of the Study:

• To assess inter-rater reliability in interpreting pediatric uroflow curves.
• To define objective criteria for uroflowmetry parameters.
• To improve the standardization of uroflow study interpretation.

Main Methods:

• 7 raters analyzed 119 deidentified uroflow studies from 5 sites.
• Curve patterns were assessed using International Children's Continence Society (ICCS) criteria and a smooth/fractionated (SF) system.
• Flow indexes (FI) for maximum (Qmax) and average (Qavg) flow were calculated.

Main Results:

• Inter-rater agreement was fair for ICCS (Kappa 0.34) and bell/tower/plateau (BTP) methods (Kappa 0.28).
• Substantial agreement (Kappa 0.70) was achieved for smooth vs. fractionated curve classification.
• Discriminant analysis showed Flow Index Qmax as a dominant vector, with prediction rates of 72% for smooth and 65.5% for fractionated curves using the SF system.

Conclusions:

• Current ICCS criteria for uroflow curve pattern analysis show poor inter-rater reliability in children.
• A proposed system using Flow Indexes and smooth/fractionated curve patterns demonstrates higher reliability.
• This objective system is recommended for more consistent uroflow interpretation across centers.