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Oligohydramnios: how severe is severe?

Nataly Zilberman Sharon1, Marina Pekar-Zlotin1, Nadav Kugler1

  • 1Department of Obstetrics and Gynecology, The Yitzhak Shamir Medical Center (formerly Assaf Harofeh Medical Center), Zerifin, Israel (affiliated with the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel).

The Journal of Maternal-Fetal & Neonatal Medicine : the Official Journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians
|March 1, 2021
PubMed
Summary
This summary is machine-generated.

Severe isolated oligohydramnios in low-risk term pregnancies is linked to increased adverse perinatal outcomes and non-reassuring fetal monitoring. Close intrapartum surveillance is recommended for these cases.

Keywords:
Amniotic fluid indexlow risk pregnanciesobstetric outcomeoligohydramnios

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Area of Science:

  • Perinatal Medicine
  • Maternal-Fetal Medicine
  • Neonatal Outcomes

Background:

  • Oligohydramnios, a condition of low amniotic fluid, can occur in term pregnancies.
  • The impact of isolated oligohydramnios severity on perinatal outcomes in low-risk pregnancies requires further investigation.

Purpose of the Study:

  • To determine if the severity of isolated oligohydramnios at term correlates with adverse perinatal outcomes.
  • To assess the association between oligohydramnios severity and fetal monitoring patterns.

Main Methods:

  • Retrospective study of low-risk term pregnancies with isolated oligohydramnios (2017-2019).
  • Oligohydramnios classified as mild (AFI 41-50 mm), moderate (AFI 21-40 mm), or severe (AFI 0-20 mm).
  • Comparison of perinatal outcomes and fetal monitoring between severity groups.

Main Results:

  • 610 women included: 202 mild, 287 moderate, 121 severe oligohydramnios.
  • Severe oligohydramnios was associated with significantly higher rates of non-reassuring fetal monitoring requiring immediate delivery (14.0% vs. 6.4-7.3%; p=.039).
  • Adverse composite neonatal outcomes were also more frequent in the severe group (19.8% vs. 10.9-11.8%; p=.048).

Conclusions:

  • Isolated severe oligohydramnios in low-risk term pregnancies indicates a higher risk of adverse perinatal events.
  • Increased rates of non-reassuring fetal monitoring and adverse neonatal outcomes necessitate close intrapartum surveillance.
  • The severity of oligohydramnios is a critical factor in predicting perinatal risk in low-risk term pregnancies.