What is the recommended management of cardiac arrest in a pregnant patient?

Management of Cardiac Arrest in Pregnancy

Immediately initiate high-quality CPR with continuous manual left lateral uterine displacement, and if return of spontaneous circulation (ROSC) is not achieved within 4 minutes, begin hysterotomy at the bedside with the goal of completing delivery by 5 minutes. 1

Immediate Positioning and Compressions

• Apply continuous manual left lateral uterine displacement (LUD) for all pregnant patients whose uterus is at or above the umbilicus (≥20 weeks gestation) throughout the entire resuscitation. 1, 2
• Keep the patient supine on a firm backboard—do not use left-lateral tilt positioning, as tilt >30° causes the patient to slide and reduces chest compression effectiveness. 1
• Manual LUD can be performed from either side: from the left, cup and lift the uterus upward and leftward; from the right, push the uterus upward and leftward—both techniques avoid downward pressure that worsens inferior vena cava compression. 1
• Manual LUD yields significantly higher coronary perfusion pressures (≈20 mmHg) compared with left-lateral tilt (≈5 mmHg, P<0.05). 1

High-Quality Chest Compressions

• Place hands in the center of the chest, identical to non-pregnant patients. 1
• Compress at a rate of ≥100 compressions per minute with a depth of ≥2 inches (5 cm). 1
• Allow complete chest recoil after each compression and minimize interruptions—keep peri-shock pauses <10 seconds. 1
• Continue chest compressions while maintaining manual LUD simultaneously. 1

Airway Management: The Highest Priority

• Airway management is the highest priority because pregnancy increases metabolic demand and reduces functional reserve, making rapid hypoxia likely. 1
• Assign the most experienced provider available, as pregnant patients frequently present difficult airways due to obesity, sleep apnea, and airway edema. 1, 3
• Provide 100% oxygen at ≥15 L/min immediately. 1
• Use a two-handed bag-mask technique with a proper seal to prevent leaks. 1
• Deliver each rescue breath over 1 second with enough tidal volume to produce visible chest rise. 1
• Give 2 breaths for every 30 compressions before placement of an advanced airway. 1
• After endotracheal intubation (use 6.0–7.0 mm inner diameter tube due to glottic edema), confirm tube placement with waveform capnography. 1, 3
• Once an advanced airway is secured, provide 1 breath every 6 seconds (≈10 breaths/min) while maintaining continuous compressions. 1

Standard ACLS Medications Without Modification

• Administer standard ACLS medications at usual adult doses—pregnancy does not require dose adjustments. 4, 1
• Give epinephrine 1 mg IV/IO every 3–5 minutes; it improves ROSC but does not alter long-term survival. 4, 1
• For refractory ventricular fibrillation or tachycardia, administer amiodarone 300 mg rapid infusion followed by 150-mg repeat doses as needed. 4, 1
• No medication should be withheld during cardiac arrest because of concerns about fetal teratogenicity—fetal concerns are overshadowed by the arrest outcome. 4, 1

Defibrillation Protocol

• Follow the standard defibrillation protocol for pregnant patients—no modifications are required. 1
• Deliver biphasic shocks at 120–200 J, with escalation if the initial shock is ineffective. 1
• Resume chest compressions immediately after each shock. 1
• Use anterolateral pad placement with the lateral pad positioned beneath the breast tissue to maintain contact. 1

The Critical 4-Minute Decision Point for Perimortem Cesarean Delivery (PMCD)

• If ROSC is not achieved within 4 minutes of cardiac arrest onset, immediately begin hysterotomy at the bedside with the goal of completing delivery by 5 minutes. 1, 3
• This applies to any pregnant patient with uterine size at or above the umbilicus (≥20 weeks gestation). 1, 2
• Fetal survival is 96% when PMCD is performed within 5 minutes versus 70% when performed later. 1
• Maternal survival has been reported in 19 of 60 cases (31.7%) when PMCD was performed, with no cases in which PMCD was deleterious to maternal survival. 4
• Median time from arrest to delivery was 9 minutes in surviving mothers compared with 20 minutes in non-survivors. 1
• Do not transport the patient to an operating room—perform PMCD at the bedside, as aseptic conditions may be rudimentary but time is critical. 4
• Emptying the uterus relieves aortocaval compression and significantly improves cardiac output and coronary perfusion pressure. 4, 1

Team Activation and Coordination

• Immediately activate a maternal cardiac arrest team using a bundled emergency code that simultaneously alerts obstetric, anesthesiology, neonatal, and intensive care services. 1, 3
• The team must include ACLS-trained emergency physicians, an obstetrician capable of immediate bedside cesarean delivery, a neonatologist with a neonatal resuscitation team, and an experienced airway provider. 3
• Ensure at least three additional staff are present for basic life support response, together with a code cart and an automated external defibrillator (AED). 1
• All units caring for pregnant patients must have prestocked neonatal crash carts with comprehensive neonatal resuscitation equipment immediately available. 3

Fetal Monitoring: Do Not Perform During Active CPR

• Do not perform fetal monitoring during active maternal cardiac arrest—it diverts critical time from maternal resuscitation efforts and carries the risk of delaying critical interventions. 4, 1
• Once maternal ROSC is achieved and the mother is stabilized, fetal heart rate surveillance may be initiated as appropriate. 4, 1

Post-Resuscitation Care

• Implement targeted temperature management for pregnant women who remain comatose after ROSC, with continuous monitoring of the fetus for bradycardia as a potential complication. 1
• Obtain obstetric and neonatal consultation. 1

Common Pitfalls to Avoid

• Do not use left-lateral tilt instead of manual LUD—tilt reduces compression effectiveness and still allows inferior vena cava compression at angles >30°. 1
• Do not delay PMCD beyond 5 minutes, as this markedly worsens both maternal and fetal outcomes. 1
• Do not underestimate airway difficulty—pregnancy predisposes to airway edema and reduced functional reserve. 1
• Do not change hand position for chest compressions—maintain standard center-chest placement. 1
• Do not transport the patient to an operating room for PMCD—delays as short as 5 minutes significantly affect survivability. 4, 3