Emergency Delivery

1. THE 2-MINUTE PHYSIOLOGY (Rapid Pathophysiology)

• The Hemodynamic Shift: During the peripartum period and emergency delivery, the physiologic changes of pregnancy maximize. Maternal blood volume and cardiac output are significantly increased, which can precipitate rapid cardiovascular decompensation in patients with underlying disease or unmask hypertensive emergencies [Conversation History].
• Aortocaval Compression: In the supine position, a gravid uterus physically compresses the inferior vena cava and descending aorta, drastically reducing venous return (preload) and rendering standard CPR mechanics ineffective during a peripartum arrest [Conversation History].
• Amniotic/Thrombotic Catastrophes: The peripartum period is a profoundly hypercoagulable state. Complications during delivery or miscarriage can trigger Disseminated Intravascular Coagulation (DIC), resulting in catastrophic hemorrhage and shock [11, Conversation History].

2. THE BEDSIDE ACTION PLAN (Rapid ER Management)

• Maternal Resuscitation & Positioning: If the patient is unstable or in cardiac arrest, perform manual left lateral uterine displacement immediately to relieve aortocaval compression and restore cardiac preload [Conversation History].
• Peripartum Hypertensive Emergency & Seizures:
• For eclamptic seizures during or immediately following delivery, administer Magnesium Sulfate 4 g IV loading dose (followed by 2 g/hr infusion) [Conversation History].
• For severe hypertension (BP >160/110), administer Labetalol 20 mg IV or Hydralazine 5–10 mg IV, targeting a BP of 140–150/90–100 mm Hg [Conversation History]. Limit IV fluids to 80 mL/hr to prevent pulmonary edema [Conversation History].
• Neonatal Resuscitation (2025 NRP Updates):
• Cord Management: Perform Delayed Cord Clamping (DCC) for at least 60 seconds [Notebook Artifact 89].
• Ventilation: Use a T-piece resuscitator to deliver 30–60 inflations per minute [Notebook Artifact 89].
• Compressions: Exclusively utilize the 2 thumb-encircling hands technique to ensure adequate depth [Notebook Artifact 89].
• Access: The umbilical venous route remains the gold standard for access and epinephrine administration [Notebook Artifact 89].

3. THE DIAGNOSTIC GRID (Differential Diagnosis & Workup)

• "Can't-Miss" Labor & Delivery Complications: The emergency physician must rapidly recognize and initiate management for:
• Placenta previa and abruptio placenta.
• Dystocia and breech presentation.
• Prolapsed umbilical cord and fetal distress.
• Postpartum hemorrhage and uterine atony.
• Prioritized Diagnostic Workup:
• Preeclampsia Panel: Send CBC, U&E, LFTs, uric acid, and a coagulation screen (to rule out DIC) [11, Conversation History].
• Continuous Fetal Monitoring: Cardiotocography is required to detect fetal distress or occult placental abruption [Conversation History].

4. THE VISUAL BOARD (ECG / POCUS / Imaging)

• The Fundal Landmark: The most critical physical/visual landmark in the peripartum crashing patient is the umbilicus. A uterine fundus palpable at or above the umbilicus visually confirms a gestational age of >20 weeks, mandating specific resuscitative guidelines [Conversation History].
• Point-of-Care Ultrasound (eFAST): Utilize the extended FAST exam to evaluate for free fluid (hemoperitoneum) or cardiac tamponade if the patient exhibits peripartum shock or trauma.
• Neonatal Airway Visualization: For neonates ≥34 weeks requiring an airway when endotracheal intubation fails, visualize and place a supraglottic airway (LMA), which is now a validated initial interface [Notebook Artifact 89].

5. THE SCORING MATRIX (Risk Stratification & Guidelines)

• The 4-Minute Rule (Resuscitative Hysterotomy): If a pregnant patient (>20 weeks gestation) suffers cardiopulmonary arrest during the peripartum period, you must initiate a resuscitative hysterotomy (perimortem cesarean) at 4 minutes of CPR without ROSC, aiming for fetal delivery by 5 minutes [Conversation History].
• Neonatal Intact Cord Milking (ICM) Criteria:
• Indicated: Non-vigorous term or late-preterm infants (≥35 weeks) when delayed cord clamping is not possible [Notebook Artifact 89].
• Strictly Contraindicated: Infants <28 weeks due to the high risk of intraventricular hemorrhage [Notebook Artifact 89].

6. THE DANGER ZONE (Pitfalls & Critical Actions)

• Deadly Cognitive Trap (2-Finger CPR): Utilizing the 2-finger chest compression technique on a neonate. Critical Action: The 2025 guidelines eliminate this; you must exclusively use the 2 thumb-encircling hands technique to ensure adequate compression depth [Notebook Artifact 89, 385].
• Deadly Cognitive Trap (Endotracheal Epinephrine): Relying on endotracheal epinephrine as a definitive treatment in a crashing neonate. Critical Action: ET epinephrine is strictly a temporizing measure; you must establish umbilical venous access as the gold standard [Notebook Artifact 89].
• Critical Action (Amniotic Fluid Embolism/DIC): If a patient develops sudden shock, absence of fever, and DIC symptoms during delivery, consider massive thromboembolic/amniotic catastrophe and consult early for hemodynamic support or ECMO.

7. MCQ MASTERCLASS (Written Exam Tips)

• The "Fundus" Buzzword: If a board question describes a crashing pregnant female and explicitly mentions "the fundus is palpable at the umbilicus," this is the test-writer's signal that the fetus is >20 weeks and a resuscitative hysterotomy is indicated [Conversation History].
• The Cord Milking Distractor: A scenario describes a floppy 26-week premature infant and asks for the next step. Intact Cord Milking will be a distractor option. You must avoid it due to the risk of intraventricular hemorrhage [Notebook Artifact 89].
• The Neonatal Ventilation Distractor: Distractor options will suggest 40-60 breaths per minute. The correct updated 2025 NRP ventilation rate is broadened to 30–60 inflations per minute via a T-piece resuscitator [Notebook Artifact 89].

8. THE BOARDROOM SCRIPT (OSCE & Oral Board Tips)

• The Immediate Action Hook: "Given this patient is presenting with an imminent complicated delivery, my immediate priorities are to activate the massive transfusion protocol, call for emergency OB/GYN and NICU backup, and prepare dual resuscitation bays for both the mother and the neonate."
• The Neonatal Pivot: "The infant is delivered but is non-vigorous. I will defer intact cord milking because the infant is premature (<28 weeks). I will move to the warmer, initiate T-piece ventilation at 30 to 60 breaths per minute, and if heart rate remains <60 bpm, I will begin 2-thumb encircling chest compressions while my team establishes an umbilical venous catheter for epinephrine." [Notebook Artifact 89]
• The Maternal Arrest Escalation: "The mother has lost pulses. I am assigning a team member to maintain continuous left lateral uterine displacement. Because her fundus is above the umbilicus, if we do not achieve ROSC by minute 4 of CPR, I will perform a resuscitative hysterotomy." [Conversation History]