Abstract
Although it becomes vitally important only after birth, renal function already plays significant role in maintaining fetal metabolic equilibrium. The kidneys significantly contribute to production of amniotic fluid. Adequate amount of amniotic fluid is needed to stimulate the intrauterine fetal respiratory activity. Intrauterine breathing is essential for lung development. As a result, oligohydramnion is conducive to pulmonary hypoplasia. The latter may lead to neonatal demise soon after birth. In extrauterine life kidneys eliminate nitrogen containing metabolic byproducts. Inadequate renal function results therefore lethal uremia. Integrity of ureters and the urethra is essential for the maintenance of renal function. Retention of urine causes degeneration of the functional units of the kidneys and ensuing deterioration of renal function. Intrauterine kidney puncture or shunt procedure may delay this process in some cases. On the other hand, once renal function has been damaged, no therapy can restart it. Certain anomalies of renal excretory pathways may also be associated with other congenital abnormalities, making the therapeutic efforts pointless. Presence of these associated intrauterine defects makes early pregnancy termination a management alternative, as well as it affects favorably perinatal mortality rates.
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