Amniotic Fluid EmbolismMANAGEMENT

GENITOURINARY AND REPRODUCTIVE PRESENTATIONS · 12 SECTIONS

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626 items

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Cardiovascular Presentations71▾

Respiratory Presentations52▾

Neurological Presentations83▾

Gastrointestinal Presentations74▾

Genitourinary and Reproductive Presentations48▾

Acute Kidney Injury (ATN)Acute Kidney Injury (Post-renal)Acute Kidney Injury (Pre-renal)Amniotic Fluid Embolism Balanitis Bladder Rupture Breast Abscess Cystitis Dialysis access complications Ectopic pregnancy Epididymitis Glomerulonephritis Hematuria (gross)Hydrocele Interstitial Cystitis Mastitis Mittelschmerz Nephrolithiasis Nephrotic Syndrome Flare Nutcracker Syndrome Orchitis Ovarian Cyst Rupture Ovarian hyperstimulation syndrome Ovarian torsion Paraphimosis Pelvic Congestion Syndrome Pelvic Inflammatory Disease (PID)Peritoneal dialysis peritonitis Phimosis Priapism Prostatitis Pyelonephritis Renal laceration Renal transplant complications and rejection Ruptured ovarian cyst Testicular torsion Torsion of Appendix Testis Tubo-ovarian abscess Ureteral Rupture Urethritis Urinary Retention Urinary tract infection (uncomplicated)Urolithiasis (renal colic)Vaginal bleeding (non-pregnant)Vaginitis (Bacterial)Vaginitis (Candidal)Varicocele Vulvovaginal Hematoma

Infectious Disease Presentations148▾

Trauma Presentations89▾

Toxicologic Presentations80▾

Psychiatric Presentations26▾

Musculoskeletal and Rheumatologic Presentations96▾

Dermatology Presentations23▾

Environmental and Exposure Presentations27▾

Hematologic and Oncologic Presentations36▾

Pediatric-Specific Presentations19▾

Endocrine and Metabolic Presentations45▾

ENT and Maxillofacial Presentations27▾

Ophthalmologic Presentations19▾

Obstetric Presentations23▾

Systemic and Miscellaneous Presentations17▾

01Approach to the Critical Patient/attcp78

Immediate priorities

›Recognition of catastrophic peripartum collapse

›Classic triad in labor or within 30 minutes of delivery

›Hemodynamic compromise

›Respiratory compromise with hypoxia

›Disseminated intravascular coagulation

›Sudden cardiovascular collapse during labor or cesarean

›Pulseless electrical activity most common arrest rhythm

›No reliable warning signs in many cases

›If any combination of triad in peripartum setting, activate AFE response

›Diagnosis of exclusion but treat empirically

›Do not delay resuscitation for confirmatory testing

›Airway and breathing threats

›Acute severe hypoxia

›SpO2 falling rapidly despite supplemental oxygen

›Frothy sputum heralding pulmonary edema

›Ventilation failure

›Tachypnea progressing to apnea

›Rising PaCO2

›If unable to protect airway or apneic, early intubation with 100% FiO2

›Rapid sequence intubation preparation

›Anticipate difficult obstetric airway

›Circulation threats

›Right ventricular failure phase

›Acute pulmonary hypertension

›Cardiogenic shock

›Hemorrhagic shock from DIC

›Oozing from IV sites and surgical wounds

02History/hx77

Onset and trigger context

›Temporal pattern

›Abrupt and unpredictable onset

›During active labor

›During cesarean delivery

›Within 30 minutes postpartum

›Relationship to labor events

›Rupture of membranes or amniotomy

›Intrauterine pressure catheter placement

›Delivery of the infant

›Prodromal symptoms

›Sudden dyspnea

›Air hunger

›Frothy sputum

›Neuropsychiatric prodrome

›Agitation and anxiety

›Sense of impending doom

›Shivering and altered mental status

›Restlessness

›Loss of consciousness

Classic presentation

›Cardiopulmonary collapse

›Sudden hypotension or pulselessness

›Cyanosis

›Respiratory failure

›Seizure-like activity

›Loss of consciousness

›Hypoxic etiology

03Physical Exam/exam49

Vital signs

›Hemodynamic instability

›Profound hypotension or pulselessness

›SBP < 90 mmHg

›MAP < 65 mmHg

›Heart rate trajectory

›Tachycardia to bradycardia to PEA

›Arrhythmia onset

›Oxygenation and ventilation

›Rapid hypoxia

›SpO2 dropping despite supplemental oxygen

›Cyanosis

›Respiratory pattern

›Tachypnea progressing to apnea

›Increased work of breathing

Focused systems exam

›Cardiovascular

›Right ventricular failure signs

›Jugular venous distension

›Muffled heart sounds

›Shock signs

›Cool and mottled extremities

›Delayed capillary refill

›Pulmonary

›Pulmonary edema findings

›Bilateral crackles

›Frothy sputum

›Hypoxic findings

04Differential Diagnosis/ddx70

Life-threatening cardiopulmonary mimics

›Pulmonary thromboembolism

›Sudden dyspnea and collapse

›Right heart strain overlap

›CT angiography if stable enough

›ICD-10 I26.99

›Acute pulmonary embolism unspecified

›Distinguished by imaging

›Acute myocardial infarction or coronary dissection

›ECG changes and troponin elevation

›ST changes may mimic AFE

›Coronary etiology on angiography

›ICD-10 I21.9

›Acute myocardial infarction unspecified

›Primary cardiac event

›Air embolism

›Procedure and positioning association

›Mill-wheel murmur

›Temporal link to line or surgery

›ICD-10 T79.0

›Air embolism traumatic

›Echo gas in right heart

Obstetric and hemorrhagic mimics

›Placental abruption with hemorrhagic shock

›Vaginal bleeding and uterine tenderness

›Fetal distress

›Hemorrhage-driven shock

›ICD-10 O45.9

05Laboratory Tests/lt45

Coagulation studies

›DIC panel

›Fibrinogen

›Often profoundly low

›Target above 150 to 200 mg/dl with replacement

›PT INR and aPTT

›Prolonged in consumptive coagulopathy

›Serial trending

›D-dimer

›Markedly elevated

›Nonspecific finding

›Hematology

›Complete blood count

›Thrombocytopenia expected

›Hemoglobin for transfusion guidance

›Type and crossmatch

›Immediate request

›Anticipate massive transfusion

Viscoelastic and perfusion testing

›Viscoelastic testing

›TEG or ROTEM

›Rapid hyperfibrinolysis detection

›Guides transfusion and TXA

›Point-of-care turnaround

›Faster than conventional coagulation labs

›Proposed diagnostic aid

›Perfusion markers

›Lactate

06Diagnostic Tests/dt74

Scoring Systems

›Clark research criteria

›Required components for case definition

›Hemodynamic compromise

›Respiratory compromise

›DIC by ISTH obstetric score

›Temporal and exclusion criteria

›Onset during labor or within 30 minutes of delivery

›Absence of other explanations

›Intended use

›Research case definition

›Not a bedside diagnostic rule

›DIC scoring

›ISTH overt DIC score

›Platelet count

›Fibrin marker D-dimer

›Prolonged PT

›Fibrinogen level

›Pregnancy-modified DIC score

›Adjusted thresholds for pregnancy physiology

›Higher baseline fibrinogen accounted for

›Limitations

›No validated diagnostic score for AFE

›Clinical recognition supersedes scoring

›Diagnosis of exclusion

›Postmortem confirmation

›Fetal squamous cells in pulmonary vasculature

›Mucin or lanugo on immunohistochemistry

07Disposition/dispo35

Level of care

›ICU admission for all patients

›No exceptions

›Ongoing DIC monitoring

›Multi-organ support

›Multidisciplinary team

›OB anesthesiology and critical care

›Hematology cardiology and neonatology

›Transfer criteria

›ECMO-capable center

›Refractory to medical management

›Not already at such a facility

›Timing

›Early activation before irreversible failure

›Stabilize for transport

Follow up and complications

›In-hospital monitoring

›Evolving organ failure 24 to 72 hours

›ARDS

›Acute kidney injury and hepatic dysfunction

›Oxygenation targets

›Wean FiO2 to SpO2 94 to 98 percent

›Lung-protective ventilation

›Secondary complication surveillance

›Thrombosis after coagulopathy resolves

›VTE prophylaxis when safe

›Balance against bleeding risk

›Endocrine and infectious

08Treatment/t78

Immediate stabilization

›Resuscitation priorities

›CPR with left uterine displacement

›High-quality chest compressions

›Manual displacement to relieve aortocaval compression

›Resuscitative hysterotomy

›Begin within 4 minutes of pulseless arrest if no ROSC

›Goal is maternal resuscitation

›Airway

›Early intubation

›100 percent FiO2

Hemodynamic support

›Vasopressor therapy

›Norepinephrine preferred over fluids

›0.05 to 3.3 mcg/kg/min infusion

›Titrate to MAP 65 mmHg

›Class IIa recommendation per SMFM

›Vasopressors before large-volume crystalloid

›Avoid RV overdistension

›Inotropic support

›Dobutamine for RV failure

›2.5 to 5.0 mcg/kg/min

›Titrate to cardiac output

›Milrinone alternative

›0.25 to 0.75 mcg/kg/min

›Inodilator effect on pulmonary vasculature

›Pulmonary vasodilators

›Inhaled nitric oxide

09Special Populations/sp33

Pregnancy

›Peripartum context

›AFE is intrinsically a pregnancy condition

›Onset during labor or within 30 minutes postpartum

›Fifth most common cause of direct maternal mortality

›Maternal resuscitation modifications

›Manual left uterine displacement during CPR

›Resuscitative hysterotomy by 4 minutes if no ROSC

›Fetal considerations

›Fetal bradycardia may precede collapse

›Neonatal team present for delivery

›Future pregnancy counseling

›Recurrence risk considered very low

›Shared decision-making essential

Geriatric

›Older parturient considerations

›Advanced maternal age as risk factor

›Age 35 years or older odds ratio 1.86

›IVF conception association

›Comorbidity burden

›Cardiovascular reserve limitations

›Higher failure-to-rescue risk

›Note on terminology

›Geriatric maternal age refers to 35 years or older

›Not classic elderly population

Pediatrics

›Neonatal implications

›High perinatal morbidity

10Background/b55

Epidemiology

›Incidence and mortality

›Incidence

›Approximately 1.9 to 6.1 per 100000 births

›Rare but catastrophic

›Case fatality

›11 to 50 percent depending on criteria

›Classic severe AFE mortality 38 to 50 percent

›Global burden

›Fifth most common cause of direct maternal mortality

›Leading cause of peripartum collapse

›Severity distribution

›Classic severe AFE

›Cardiac arrest with DIC and hemorrhage

›Mortality 38 to 50 percent

›Atypical or partial AFE

›Isolated coagulopathy or hemodynamic instability

›Lower but still significant mortality

Pathophysiology

›Mechanism

›Immune-mediated anaphylactoid reaction

›Reaction to fetal antigens

›Not primarily mechanical obstruction

›Mediator release

›Tissue factor activating coagulation

›Endothelin causing pulmonary vasoconstriction

›Complement activation

›Inflammatory cascade

11Patient Discharge Instructions/pdi21

copy discharge instructions

›Survivor recovery information

›You had a rare and serious condition called amniotic fluid embolism

›Your heart, lungs, and blood clotting were affected

›Recovery is gradual and may take weeks to months

›Attend all follow-up appointments

›Warning signs to return to ER

›Trouble breathing or chest pain

›New or heavy bleeding or easy bruising

›Severe headache or confusion

›Fainting or palpitations

›Leg swelling or pain suggesting a clot

›Fever or signs of infection

›Follow up plan

›Obstetric follow-up after hospital discharge

›Cardiology review for heart function recovery

›Neurology review if any brain oxygen injury occurred

›Counseling for emotional recovery and trauma

›Future pregnancy counseling

›Recurrence risk is believed to be very low

›No firm restriction on future pregnancy

›Discuss plans with your obstetric specialist

12References/r11

Guidelines and key sources

›Society guidelines

›SMFM Special Statement checklist for initial management of AFE 2021

›AHA 2025 guidelines for CPR and emergency cardiovascular care

›Clark research case definition criteria 2016

›Landmark and review evidence

›JAMA Network Open population study on pregnancy characteristics and maternal mortality 2022

›WOMAN trial supporting tranexamic acid in obstetric hemorrhage

›Critical Care Obstetrics 7th Edition AFE chapter 2024

›Coding standards

›ICD-10 O88.1 amniotic fluid embolism

›SNOMED CT amniotic fluid embolism disorder concept

Learn More: Amniotic Fluid Embolism→

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Reviewed by SymptomDx Medical Team · Last reviewed August 18, 2026

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