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Immunologic studies in presumed amniotic fluid embolism.

M D Benson1, H Kobayashi, R K Silver

  • 1Department of Obstetrics and Gynecology, Northwestern University Medical School, Chicago, Illinois, USA. michael.benson@home.com

Obstetrics and Gynecology
|March 29, 2001
PubMed
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Complement activation, not anaphylaxis, appears involved in amniotic fluid embolism. This study found low complement levels in patients, suggesting a key role for this immune response in the condition.

Area of Science:

  • Immunology
  • Obstetrics
  • Pathophysiology

Background:

  • Amniotic fluid embolism (AFE) is a rare but often fatal obstetric emergency.
  • The exact pathophysiological mechanisms underlying AFE remain incompletely understood.
  • Potential roles of mast cell degranulation (anaphylaxis) and complement activation have been hypothesized.

Purpose of the Study:

  • To investigate the involvement of immunologic mechanisms, specifically mast cell degranulation and complement activation, in the pathophysiology of amniotic fluid embolism.
  • To differentiate between anaphylaxis and complement activation as potential drivers of AFE.

Main Methods:

  • A case series design was employed, including nine women diagnosed with presumed amniotic fluid embolism.
  • A control group of 22 women with normal labor was included for comparison.

Related Experiment Videos

  • Maternal peripartum serum levels of complement components (C3 and C4), serum tryptase, urinary histamine, and serum fetal antigen (sialyl Tn) were measured.

    • Main Results:

    • Serum tryptase and urinary histamine levels were negative in AFE patients, ruling out anaphylaxis.
    • Elevated levels of fetal antigen (sialyl Tn) were observed in seven of nine AFE patients.
    • All tested AFE patients (eight) exhibited significantly lower serum complement levels (C3 and C4) compared to controls (P=.018 for C3, P=.012 for C4).

    Conclusions:

    • Serologic findings strongly suggest that complement activation plays a significant role in the mechanism of amniotic fluid embolism.
    • The study's laboratory data did not support the involvement of mast cell degranulation (anaphylaxis) in the pathophysiology of AFE.