Fetal Intervention for Lower Urinary Tract Obstruction
Summary
Lower urinary tract obstruction (LUTO) in the fetus encompasses a spectrum of conditions characterised by impaired urine excretion from the bladder, most commonly due to posterior urethral valves in male fetuses. Obstructive uropathy leads to urine retention, megacystis, progressive renal dysplasia and oligohydramnios. The resultant low amniotic fluid volume predisposes to pulmonary hypoplasia, which is a principal determinant of perinatal mortality. Fetal intervention has evolved to mitigate these risks by restoring urine flow into the amniotic cavity, thereby promoting lung maturation and preserving renal development. Initial approaches in limb reduction syndrome involved invasive vesicoamniotic shunting, advanced through improved imaging guidance and miniaturised devices. Contemporary practice prioritises early detection by detailed ultrasound assessment of fetal bladder size, amniotic fluid index and Doppler evaluation. Candidates for intervention are selected on the basis of bladder diameter, absence of syndromic anomalies and favourable fetal urine biochemical markers. Techniques include percutaneous vesicoamniotic shunt placement and, in specialised centres, fetoscopic valve ablation. Although perinatal survival has improved, long-term renal outcomes remain variable, reflecting the extent of pre-existing parenchymal damage. Multidisciplinary collaboration between maternal–fetal medicine specialists, paediatric nephrologists and neonatologists is essential to optimise timing, device selection and postnatal follow-up.
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Fetal Intervention for Lower Urinary Tract Obstruction publication trend
The graph below shows the total number of articles in fetal intervention for lower urinary tract obstruction across all publications each year (not limited to Nature Index journals).
Technical terms
Lower urinary tract obstruction (LUTO): Impairment of urine flow from the fetal bladder, commonly due to structural narrowing or valves in the urethra.
Megacystis: Abnormal enlargement of the fetal bladder visible on ultrasound due to urine retention.
Vesicoamniotic shunting: A percutaneous procedure to insert a catheter between the fetal bladder and the amniotic cavity, restoring urine drainage.
Oligohydramnios: Reduced amniotic fluid volume, typically below the fifth centile for gestational age.
Pulmonary hypoplasia: Underdevelopment of fetal lungs caused by inadequate amniotic fluid and thoracic compression.
References
- Fetal Lower Urinary Tract Obstruction (LUTO): a practical review for providers. Maternal Health, Neonatology and Perinatology (2015).
- Antenatal Workup of Early Megacystis and Selection of Candidates for Fetal Therapy. Fetal Diagnosis and Therapy (2018).
- Vesicoamniotic Shunting before 17 + 0 Weeks in Fetuses with Lower Urinary Tract Obstruction (LUTO): Comparison of Somatex vs. Harrison Shunt Systems. Journal of Clinical Medicine (2022).
- Vesicoamniotic shunting for fetal megacystis in the first trimester with a Somatex® intrauterine shunt. Archives of Gynecology and Obstetrics (2020).
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