Risk factors for renal insufficiency in children with urethral valves

Area of Science:

• Pediatric Nephrology
• Medical Imaging
• Urology

Background:

• Posterior urethral valves (PUV) are a leading cause of childhood end-stage kidney disease (ESKD).
• Identifying early risk factors for renal failure progression in PUV patients is crucial for timely intervention.

Purpose of the Study:

• To identify clinical and sonographic risk factors for the progression of chronic kidney disease (CKD) in pediatric patients with PUV.
• To evaluate the utility of postnatal renal ultrasound in predicting the rate of estimated glomerular filtration rate (eGFR) decline.

Main Methods:

• Retrospective analysis of 42 male patients with PUV, including clinical data, renal function tests, and initial postnatal renal ultrasounds.
• Comparison of patients with and without decreased eGFR (K/DOQI CKD stage 0-1 vs. 2-5) to identify significant risk factors.
• Receiver operating characteristic (ROC) curve analysis to determine predictive values of specific ultrasound parameters.

Main Results:

• Twelve patients (28.6%) developed ESKD by a median age of 11.3 years.
• Significant risk factors for eGFR loss included renal volume <3rd percentile, elevated echogenicity, poor corticomedullary differentiation, >3 febrile UTIs, and decreased eGFR at 1 year.
• Renal volume >88.2 ml/m(2) BSA predicted a low risk of developing K/DOQI CKD stage 5.

Conclusions:

• Early postnatal renal ultrasound findings are valuable predictors of renal function decline in children with PUV.
• Specific ultrasound parameters can help identify high-risk patients requiring closer monitoring and potential early intervention.
• Ultrasound serves as a critical tool for assessing prognosis and guiding management strategies in pediatric PUV patients.