A 35-year-old G4P3 woman at 39 weeks gestation is in active labor when she suddenly develops severe dyspnea, cyanosis, and hypotension. Her vital signs are: BP 70/40 mmHg, HR 140 bpm, RR 32/min, O2 sat 85%. She becomes unresponsive and develops seizure-like activity. The fetal heart rate shows severe bradycardia at 60 bpm. What is the nurse's highest priority action?

• 1 Immediately prepare for emergency cesarean section
• 2 Administer high-flow oxygen via non-rebreather mask
• 3 Establish large-bore IV access and begin fluid resuscitation
• 4 Call for immediate physician assistance and activate emergency response team ✓ 정답

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