A patient in labor suddenly becomes hypoxic and hypotensive. Minutes later, she arrests and then begins bleeding uncontrollably. Amniotic fluid embolism (AFE) is rare, unpredictable, and potentially catastrophic, requiring rapid recognition and a coordinated resuscitation before the diagnosis is ever certain.
In this episode, Drs. Caroline Bank and Kim Bambach discuss a practical approach to recognizing and managing AFE, including the clinical clues that distinguish it from other causes of maternal collapse, pregnancy-modified resuscitation, management of right ventricular failure and coagulopathy, and the importance of early multidisciplinary activation. They also discuss what happens after survival, from team debriefing to communicating with patients after a traumatic birth. This episode is part of the Ohio CORES (Collaborative Obstetric Resuscitation Education and Simulation) series at The Ohio State University, supported by a grant from the Ohio Department of Children and Youth.
Guest: Caroline Bank, MD; Host: Kim Bambach, MD
🔑 Key Learning Points
1. Think of the “3 Bs”: Breathing, Blood Pressure, and Bleeding
AFE is a clinical diagnosis. Consider it when a laboring or recently postpartum patient develops sudden:
- Hypoxia
- Hypotension
- Altered mental status
- Cardiovascular collapse or cardiac arrest
- Coagulopathy or unexpected bleeding
The Amniotic Fluid Embolism Foundation describes the classic presentation using the 3 Bs: Breathing, Blood Pressure, and Bleeding. Subtle symptoms, including anxiety, restlessness, chills, or dyspnea, may precede cardiovascular collapse.
2. Timing and early coagulopathy are important clues
The differential for maternal cardiovascular collapse is broad and includes pulmonary embolism, hemorrhage, eclampsia, and other causes of cardiac arrest.
Two clues should particularly raise suspicion for AFE:
- Timing: AFE typically occurs during labor or shortly after delivery.
- Early coagulopathy: Sudden cardiopulmonary collapse accompanied by early DIC is particularly concerning.
In hemorrhagic shock, coagulopathy generally develops as bleeding progresses and clotting factors are depleted. In AFE, coagulopathy may precede the major hemorrhage.
3. Resuscitate first. The diagnosis can come later.
When AFE is suspected:
- Secure the airway and optimize oxygenation.
- Establish adequate IV access.
- Support circulation with vasopressors, blood products, and appropriately selected fluids.
- Activate OB, anesthesia, the resuscitation/code team, and blood bank early.
- Anticipate rapidly evolving coagulopathy and hemorrhage.
AFE can deteriorate extraordinarily quickly. Mobilizing resources early is critical.
4. If cardiac arrest occurs, use pregnancy-modified resuscitation
Prioritize:
- High-quality CPR
- Airway and oxygenation
- Manual left uterine displacement
- Rapid preparation for resuscitative hysterotomy when indicated
Maternal resuscitation remains the priority. The interventions that improve maternal circulation also improve fetal perfusion.
5. Think about the right ventricle
Bedside echocardiography can help identify right ventricular strain or dysfunction.
When significant right heart dysfunction is present, consider:
- Vasopressors
- Inotropic support
- Pulmonary vasodilators when available and appropriate
- Avoiding excessive fluid administration that may worsen RV overload
This is an important physiologic distinction. Profound hypotension does not automatically mean the patient needs large-volume crystalloid resuscitation.
6. Activate ECMO early when available
In refractory cardiovascular collapse, involve the ECMO team early rather than waiting until other options have been exhausted.
Concern for hemorrhage or DIC does not necessarily preclude ECMO. Extracorporeal support can initially be initiated without anticoagulation while a patient is profoundly coagulopathic.
7. AFE resuscitation is a team sport
A critically ill postpartum patient may simultaneously require maternal resuscitation, hemorrhage control, massive transfusion, neonatal resuscitation, and advanced cardiovascular support.
Clearly divide responsibilities according to team expertise:
- ED: code leadership, airway, vascular access, resuscitation
- OB: uterine and hemorrhage management
- NICU/neonatal team: neonatal resuscitation
- ECMO team: advanced mechanical circulatory support when indicated
Early role assignment allows multiple critical interventions to occur simultaneously rather than sequentially.
8. The resuscitation does not end with ROSC
Survivors of AFE may face substantial physical and psychological consequences. The episode emphasizes coordinated post-arrest care, rehabilitation, and support for both patients and clinicians following a traumatic delivery.
9. Debrief the patient, not just the team
Patients may leave the hospital having heard different versions of what happened from multiple specialists.
Whenever possible:
- Provide a coherent explanation of the hospitalization.
- Give patients a record they can bring to future clinicians.
- Address questions about future pregnancies and fertility rather than dismissing them.
- Avoid potentially triggering language focused on how unlikely survival was.
The AFE Foundation provides resources to help survivors understand and document their hospital course.
