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ICU TopicsObstetric critical care

ICU · Obstetric critical care

Amniotic Fluid Embolism

Also known as Amniotic fluid embolism · AFE · Anaphylactoid syndrome of pregnancy · AFE biphasic

Amniotic fluid embolism (AFE): catastrophic peripartum collapse with hypoxia, hypotension and often DIC. Clinical diagnosis (SMFM); biphasic cardiopulmonary then coagulopathic course; resuscitation, uterine displacement, delivery after arrest at 23 weeks or more, massive transfusion, and VA-ECMO as a controversial bridge. Reported mortality 20 to 60 percent (Clark); UKOSS case fatality 19 percent.

high16 referencesUpdated 5 Sept 202619 min readSource-verified · Sept 2026

Checked against its sources on 5 Sept 2026

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Amniotic fluid embolism (AFE) is a catastrophic, unpredictable peripartum syndrome — fetal antigen exposure during labour, delivery or within 30 minutes of placenta delivery triggers an abnormal maternal inflammatory response (SIRS-like / anaphylactoid, with a possible mechanical component). The usual picture is sudden hypoxaemia and cardiovascular collapse, followed in many cases by explosive DIC. Diagnose clinically (SMFM: no confirmatory laboratory test), resuscitate with high-quality CPR and uterine displacement, deliver immediately after arrest if the fetus is 23 weeks or more, treat bleeding with a standard massive transfusion protocol and tranexamic acid, and consider VA-ECMO only with the 2016 SMFM caveat that it is not routine.[1][2][4][12]

Meet the patient

A 33-year-old woman, gravida 4 para 3, delivers by forceps at 39 weeks. Eight minutes later she says she feels like she is going to die, turns cyanosed, gasps, seizes and arrests. Her IV sites ooze and her perineal repair bleeds. Bedside echo shows a dilated right ventricle and a globally stunned left ventricle.[2][11]

Two questions decide her next hour, and they decide every AFE: is this unexplained peripartum collapse with coagulopathy? — then it is AFE until proven otherwise — and can I resuscitate, deliver and support the circulation in time? — the clock answers over minutes. Hold those two and the pathway below slots into place.[1]

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References16ShowHide
  1. [1]Andonotopo W, Bachnas MA, Dewantiningrum J, et al. Amniotic Fluid Embolism: a comprehensive review of diagnosis and management J Perinat Med, 2025.PMID 40842297
  2. [2]Pacheco LD, Saade G, Hankins GD, Clark SL Amniotic fluid embolism: diagnosis and management Am J Obstet Gynecol, 2016.PMID 26987420
  3. [3]Mazza GR, Youssefzadeh AC, Klar M, et al. Association of Pregnancy Characteristics and Maternal Mortality With Amniotic Fluid Embolism JAMA Netw Open, 2022.PMID 36399343
  4. [4]Clark SL Amniotic fluid embolism Obstet Gynecol, 2014.PMID 24402585
  5. [5]Viau-Lapointe J, Filewod N Extracorporeal Therapies for Amniotic Fluid Embolism Obstet Gynecol, 2019.PMID 31599831
  6. [6]Wiseman D, Simard C, Yang SS, et al. Echocardiography findings in amniotic fluid embolism: a systematic review of the literature Can J Anaesth, 2023.PMID 36307749
  7. [7]WOMAN Trial Collaborators (Shakur H, Roberts I, Fawole B, et al.) Effect of early tranexamic acid administration on mortality, hysterectomy, and other morbidities in women with post-partum haemorrhage (WOMAN): an international, randomised, double-blind, placebo-controlled trial Lancet, 2017.PMID 28456509
  8. [8]Coggins AS, Gomez E, Sheffield JS Pulmonary Embolism and Amniotic Fluid Embolism Obstet Gynecol Clin North Am, 2022.PMID 36122978
  9. [9]Plantzas I, Tousia A, Vlachodimitropoulos D, et al. The Anaphylactoid Syndrome of Pregnancy: Two Autopsy Cases Cureus, 2023.PMID 37842488
  10. [10]Nichols L, Elmostafa R, Nguyen A, Callins KR Amniotic fluid embolism: lessons for rapid recognition and intervention Autops Case Rep, 2021.PMID 34458179
  11. [11]Moore J, Baldisseri MR Amniotic fluid embolism Crit Care Med, 2005.PMID 16215348
  12. [12]Clark SL, Romero R, Dildy GA, et al. Proposed diagnostic criteria for the case definition of amniotic fluid embolism in research studies Am J Obstet Gynecol, 2016.PMID 27372270
  13. [13]Fitzpatrick KE, Tuffnell D, Kurinczuk JJ, et al. Incidence, risk factors, management and outcomes of amniotic-fluid embolism: a population-based cohort and nested case-control study BJOG, 2016.PMID 25683758
  14. [14]Sultan P, Seligman K, Carvalho B Amniotic fluid embolism: update and review Curr Opin Anaesthesiol, 2016.PMID 27153475
  15. [15]Wolfovitz A, Brenner B, Solt I Peripartum Vascular Calamities: Placental Abruption and Amniotic Fluid Emboli Semin Thromb Hemost, 2026.PMID 42259376
  16. [16]Pham HN, Huynh NX, Pham PNH, et al. Reference intervals of complete blood count and coagulation tests in Vietnamese pregnant women BMC Pregnancy Childbirth, 2023.PMID 37951881

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