Chest Pain in a Young Woman with a Normal ECG
A 29-year-old woman, 10 weeks postpartum, presents at 02:00 with 2 hours of sudden-onset central chest pain radiating to the back, dyspnea, and one episode of syncope at home. BP 92/60 mmHg, HR 118/min, RR 26/min, SpO2 94% on room air, afebrile. She had a cesarean delivery 10 weeks ago and reports no prior cardiac history. ECG shows sinus tachycardia with 1 mm ST depression in V4-V6 and no ST elevation; troponin is not yet back. Bedside ultrasound shows a normal-sized right ventricle without obvious dilation, no pericardial effusion, and a grossly normal left ventricular ejection fraction. The nearest CT pulmonary angiogram is available but the CT suite is on standby for a trauma case for the next 45 minutes.
1. What is your leading diagnosis, and how do the bedside findings change or not change your management?
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Leading diagnosis: acute pulmonary embolism (high clinical probability). Postpartum state within 12 weeks, sudden pleuritic/central pain, syncope, tachycardia, hypoxia, and hypotension (systolic <90 is a high-risk criterion) all point to PE. Syncope plus hypotension places her in the high-risk (massive) PE category until proven otherwise.
Ultrasound interpretation: A normal-appearing RV does not exclude PE and does not downgrade her risk category. The RV can appear normal early or intermittently, and a single view is operator- and timing-dependent. What matters is the hemodynamic state, not the echo. Do not use a reassuring echo to delay imaging or treatment.
Action: Give anticoagulation now (weight-based LMWH or unfractionated heparin - UFH is preferred if thrombolysis or surgery is contemplated) unless actively bleeding. Do not wait for the troponin or the CT. If she deteriorates (persistent hypotension, rising lactate, worsening hypoxia), proceed to systemic thrombolysis on clinical grounds; bedside echo showing RV strain would support but is not mandatory. Push the CT suite to expedite given the standby conflict, or arrange an alternative (bedside echo-assisted decision, transfer).
2. The CT is delayed 45 minutes. What is your disposition and treatment plan during that window, and what monitoring is required?
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Disposition: Resuscitation bay with continuous cardiac monitoring, IV access ×2, and immediate availability of airway and vasopressor support. Do not send her to a waiting room.
During the 45-minute window:
- Anticoagulate immediately - the diagnosis is highly probable and the risk of withholding heparin in high-probability PE exceeds the risk of a short course in a stable-enough patient. Use UFH infusion (easier to reverse if thrombolysis is chosen) or LMWH per local protocol.
- Fluids cautiously - small boluses (250–500 mL) for hypotension; over-resuscitation worsens RV failure. Start norepinephrine if MAP remains low after a small bolus.
- Oxygen to keep SpO2 ≥90%; consider high-flow or NIV if work of breathing rises.
- Serial reassessment every 15 minutes: BP, HR, SpO2, mental status, urine output, lactate.
- Escalation trigger: if she develops sustained hypotension, worsening hypoxia, or cardiac arrest, activate the thrombolysis pathway (alteplase) without waiting for CT.
- Notify the CT team and the on-call intensivist/cardiologist of the standby conflict; document the delay.
Key judgment: In high-probability PE with hemodynamic compromise, the risk-benefit of empiric anticoagulation favors treatment; the real error is the 45-minute wait with no heparin on board.