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Chronic abruption-oligohydramnios sequence

J P Elliott1, B Gilpin, T H Strong

  • 1Phoenix Perinatal Associates, Arizona, USA.

The Journal of Reproductive Medicine
|June 4, 1998
PubMed
Summary
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Chronic abruption-oligohydramnios sequence (CAOS) can occur in pregnancies with placental abruption. This condition typically results in delivery around 28 weeks of gestation.

Area of Science:

  • Obstetrics and Gynecology
  • Maternal-Fetal Medicine
  • Perinatology

Background:

  • Placental abruption is a significant obstetric complication.
  • Chronic abruption-oligohydramnios sequence (CAOS) is a specific presentation requiring further investigation.

Purpose of the Study:

  • To determine the clinical outcomes for patients diagnosed with CAOS.
  • To characterize the gestational age at delivery for pregnancies affected by CAOS.

Main Methods:

  • Retrospective review of patients delivering at a tertiary medical center over 54 months.
  • Inclusion criteria: diagnosis of placental abruption with oligohydramnios or ruptured membranes.
  • CAOS definition: vaginal bleeding without previa, normal initial amniotic fluid, and subsequent oligohydramnios without ruptured membranes.

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Main Results:

  • Twenty-four patients with CAOS were identified.
  • Mean gestational age at delivery was 28.1 weeks; 14/24 had abruption onset before 20 weeks.
  • Patients with early abruption (<20 weeks) delivered significantly earlier (26.1 weeks) compared to controls.

Conclusions:

  • CAOS is a recognized complication in pregnancies with abruptio placentae.
  • Delivery in CAOS cases averages 28 weeks of gestation.