Why it matters
Shortness of breath and chest tightness in a young patient often get brushed off as “just anxiety.” But pulmonary embolism (PE) can look deceptively benign — and missing it can be fatal. The rookie’s job is to resist anchoring bias and always consider PE when the story doesn’t add up.
1) The 30-second story
- Patient presents with dyspnea, chest tightness, palpitations.
- Looks anxious, tachypneic, maybe tachycardic.
- Normal exam, maybe just a little hypoxic.
- No obvious trigger for “panic attack.”
2) Quick differential
- PE (silent killer).
- Panic attack/anxiety.
- Pneumonia, asthma, COPD exacerbation.
- ACS, pericarditis.
- Pneumothorax.
- Arrhythmia.
- Anemia, sepsis, metabolic acidosis.
3) Red flags 🚨
- Unexplained tachycardia or hypoxia.
- Pleuritic chest pain or hemoptysis.
- Syncope with dyspnea.
- Recent surgery, long flight, immobilization, OCP use, cancer, pregnancy.
- Leg pain/swelling (DVT clue).
- Family history of clotting disorders.
4) Bedside exam & first steps
- Vitals: HR, RR, O₂ sat are key — don’t dismiss mild abnormalities.
- Look for DVT: unilateral swelling, tenderness.
- Listen to the story: if patient never had anxiety before, be skeptical.
- POCUS: RV strain, DVT in femoral/popliteal veins.
5) Investigations
- ECG: sinus tachycardia, S1Q3T3, right axis deviation, RBBB, T-wave inversion in V1–V3 (none are sensitive, but supportive).
- CXR: often normal; rules out other causes.
- D-dimer: high sensitivity, use in low/intermediate risk patients.
- CT Pulmonary Angiography (CTPA): gold standard.
- V/Q scan: alternative if CTPA contraindicated (pregnancy, renal failure).
- ABG: may show hypoxemia, respiratory alkalosis.
6) Management in the ED
- Stabilize: O₂, IV access, monitor.
- Massive/submassive PE (shock, hypotension, RV strain):
- Thrombolysis (alteplase 100 mg IV over 2 h) if no contraindications.
- Consider surgical or catheter-directed thrombectomy.
- Non-massive PE (stable):
- Anticoagulation (LMWH, DOACs, heparin infusion if bridging to warfarin).
- DVT + suspected PE with contraindication to anticoagulation → consider IVC filter.
7) Disposition
- Admit: all unstable patients, those needing thrombolysis, high clot burden, severe comorbidities.
- Safe discharge: stable, low-risk PE (no hypoxia, no RV strain, low PESI score), with outpatient anticoagulation and follow-up.
Rookie pearls
- Don’t call it “anxiety” until you’ve ruled out hypoxia, PE, ACS, arrhythmia.
- First episode anxiety in a middle-aged patient = red flag.
- A normal CXR + unexplained hypoxemia = think PE.
- D-dimer is useless if pretest probability is high — go straight to imaging.
- Always ask about travel, surgery, OCPs, family history.
Common pitfalls
- Anchoring on anxiety in young women with tachycardia and chest tightness.
- Using D-dimer in a high-probability patient (wastes time, can be misleading).
- Missing subtle hypoxemia or tachycardia as “nerves.”
- Forgetting RV strain assessment on POCUS/echo.
- Discharging with a “panic attack” diagnosis without labs or imaging.
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