Late onset severe oligohydramnios associated with genitourinary abnormalities

Area of Science:

• Perinatal Medicine
• Fetal Urology
• Neonatology

Background:

• Severe oligohydramnios in the third trimester is a critical condition.
• Urinary tract abnormalities can significantly impact fetal development and outcomes.
• Understanding the interplay between these conditions is crucial for perinatal care.

Purpose of the Study:

• To evaluate the outcomes of fetuses presenting with third-trimester severe oligohydramnios and concurrent urinary tract abnormalities.
• To assess the impact of different types of urinary tract abnormalities on fetal and neonatal outcomes.
• To analyze the relationship between gestational age at presentation and delivery timing with postnatal outcomes.

Main Methods:

• Retrospective review of 8 fetal cases over a 2-year period.
• Inclusion criteria: third-trimester onset of severe oligohydramnios and diagnosed urinary tract abnormalities (obstructive uropathy or cystic renal disease).
• Evaluation of diagnostic methods, gestational age at presentation, delivery management, and postnatal pulmonary and renal function.

Main Results:

• Severe oligohydramnios onset occurred between 27 and 33 weeks gestation.
• Five of 8 neonates exhibited excellent immediate and late postnatal pulmonary function.
• Three neonates experienced respiratory distress, with one mortality at birth.
• Renal function varied among survivors; supravesical obstructive uropathy correlated with normal serum creatinine, unlike renal cystic disease or infravesical obstruction.

Conclusions:

• Fetuses with third-trimester severe oligohydramnios and urinary tract abnormalities have variable outcomes.
• Pulmonary function is often preserved, but renal function prognosis depends on the specific uropathy.
• Supravesical obstructive uropathy may have a better renal outcome compared to renal cystic disease or infravesical obstruction.