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Amniotic fluid embolism: a reappraisal.
Bruce K Young1,2, Pascalle Florine Magdelijns3, Judith L Chervenak4
1Department of Obstetrics and Gynecology, New York University Grossman School of Medicine, New York City, USA.
Journal of Perinatal Medicine
|December 12, 2023
Summary
New criteria improve amniotic fluid embolism (AFE) diagnosis, identifying more cases with fewer false positives. This study also highlights potential risk factors like advanced maternal age and cesarean delivery, proposing a novel pathophysiology theory.
Area of Science:
- Obstetrics and Gynecology
- Maternal-Fetal Medicine
- Critical Care Medicine
Background:
- Amniotic fluid embolism (AFE) is a rare but catastrophic obstetric emergency with high maternal mortality.
- Existing diagnostic criteria for AFE may not capture all true cases, potentially delaying critical interventions.
- Understanding AFE pathophysiology and associated risk factors is crucial for improving patient outcomes.
Approach:
- This retrospective case review analyzed 29 cases of amniotic fluid embolism (AFE), including 8 from institutional experience and 21 from published literature.
- Cases were evaluated using both established (Clark et al.) and newly proposed diagnostic criteria for AFE.
- Clinical and demographic data were collected to identify potential risk factors and analyze correlations.
Key Points:
- The proposed diagnostic criteria identified all 29 AFE cases, unlike existing criteria which identified none.
- Identified risk factors include advanced maternal age (≥32 years), in-vitro fertilization, placenta previa, and cesarean delivery (particularly elective).
- The incidence of AFE was 2.9 per 100,000 births, with a maternal mortality rate of 17.2% in this series.
Conclusions:
- The developed criteria offer improved sensitivity for AFE diagnosis with a low false-positive rate.
- Findings support previously reported associations and suggest a potential link between cesarean birth and AFE risk.
- A novel hypothesis for AFE pathophysiology is proposed, warranting further investigation.
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