Vesicoureteral Reflux Index: 2-Institution Analysis and Validation

Area of Science:

• Pediatric Urology
• Nephrology
• Medical Diagnostics

Background:

• Vesicoureteral reflux (VUR) is common in infants, with spontaneous resolution rates varying significantly.
• Predicting VUR resolution is crucial for guiding treatment and minimizing complications like renal scarring.
• Novel tools are needed to accurately assess VUR prognosis in young children.

Purpose of the Study:

• To validate the discriminatory power of the vesicoureteral reflux index (VRI) in predicting spontaneous VUR resolution.
• To assess the VRI's ability to predict the rate of VUR resolution in children under 2 years old.

Main Methods:

• A multi-institutional study evaluated patients diagnosed with primary VUR before 24 months of age.
• Data included demographics, VUR grade and timing, ureteral anomalies, and radiographic outcomes.
• Time-to-event analysis using the C-index was performed to assess resolution rates.

Main Results:

• The study included 369 children (219 girls, 150 boys) with a mean age at diagnosis of 4.7 months.
• VUR resolution rates decreased as the VRI score increased (e.g., 88.2% for VRI 1 vs. 14.3% for VRI ≥5).
• Factors like filling phase VUR, high-grade reflux, and ureteral anomalies were associated with longer resolution times.

Conclusions:

• The vesicoureteral reflux index is a simple, reliable tool for predicting VUR improvement and spontaneous resolution in infants.
• The VRI provides valuable prognostic information to guide individualized patient care for VUR.
• This index can help clinicians make informed decisions regarding observation versus surgical intervention.