Sequential urinalysis improves evaluation of fetal renal function in obstructive uropathy

Area of Science:

• Perinatal Medicine
• Fetal Surgery
• Pediatric Nephrology

Background:

• Obstructive uropathy in fetuses can lead to significant renal damage.
• Accurate assessment of renal damage is crucial for timely intervention.
• Current methods of urine sampling may have limitations in diagnostic precision.

Purpose of the Study:

• To evaluate if sequential vesicocenteses improve the assessment of renal damage in fetuses with obstructive uropathy.
• To compare the diagnostic accuracy of sequential urine sampling versus single urine sampling.
• To identify specific urine parameters and trends indicative of renal damage.

Main Methods:

• Twenty-nine fetuses diagnosed with complete obstructive uropathy were included.
• A minimum of three sequential vesicocenteses were performed at 48- to 72-hour intervals.
• First and last urine samples were analyzed for multiple parameters, comparing their predictive value against postnatal or fetal autopsy findings.

Main Results:

• Fetuses with minimal renal damage showed decreasing urine hypertonicity and favorable last urine values.
• Fetuses with significant renal damage exhibited higher initial values and increasing hypertonicity patterns.
• Last urine samples were more predictive of renal damage than first samples for five out of six analyzed parameters.

Conclusions:

• Sequential vesicocenteses, combined with pattern-of-change trend analysis, enhance diagnostic precision for renal damage in fetal obstructive uropathy.
• Last urine sample analysis is a more reliable indicator of renal damage compared to the first sample.
• This approach aids in better prognostication and management decisions for affected fetuses.