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Unexplained second trimester oligohydramnios: a clinical-pathologic study.

D E Hickok1, J McClean, T H Shepard

  • 1Department of Epidemiology, School of Public Health, University of Washington, Seattle 98195.

American Journal of Perinatology
|January 1, 1989
PubMed
Summary
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Oligohydramnios, a condition of low amniotic fluid, is linked to poor pregnancy outcomes even without fetal abnormalities. Early ultrasound detection may reveal this condition at an earlier stage of pregnancy failure.

Area of Science:

  • Perinatology
  • Fetal Medicine
  • Obstetrics

Background:

  • Oligohydramnios is associated with adverse pregnancy outcomes.
  • The significance of oligohydramnios without fetal malformations is increasingly recognized.

Purpose of the Study:

  • To investigate the pathological findings in fetuses with oligohydramnios detected by ultrasound in the absence of amniotic fluid leakage.
  • To characterize the fetal anomalies associated with isolated oligohydramnios.

Main Methods:

  • Pathologic dissections were performed on four fetuses.
  • Mothers of these fetuses were identified via ultrasound for oligohydramnios.
  • Cases with clinical evidence of amniotic fluid leakage were excluded.

Main Results:

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  • Fetuses exhibited lung hypoplasia and varying degrees of Potter's facies.
  • Kidneys were histologically normal but showed increased weight.
  • No significant fetal malformations were noted besides these findings.

Conclusions:

  • Isolated oligohydramnios may represent an earlier stage of pregnancy failure.
  • Increased use of ultrasound may lead to earlier detection of such cases.
  • Further research is needed to understand the long-term implications and management of isolated oligohydramnios.