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Emergency Medicine›Condition·Updated Jul 11, 2026·v1

Pulmonary Embolism

Pulmonary embolism is a common cardiovascular emergency requiring rapid diagnosis and risk-adapted therapy. The 2026 AHA/ACC classification integrates hemodynamic status, RV function, and biomarkers to guide treatment. Low-risk patients (sPESI=0, no RV strain) can be managed at home with a DOAC. Intermediate-risk patients with RV dysfunction should be considered for catheter-directed therapy (PERT activation). High-risk patients with hypotension need immediate systemic thrombolysis (<30 minutes). The age-adjusted D-dimer and PERC rule safely reduce unnecessary imaging. Long-term management includes extended anticoagulation for unprovoked or cancer-associated PE, with reduced-dose DOACs for secondary prevention.

High Evidence455 references·11,807 words·48 min read·v1
pulmonary embolismvenous thromboembolismemergency medicinethrombolysisanticoagulationDOACrisk stratificationPERT

Quick Reference

RxDrug of choice[[Apixaban]] 10 mg PO BID for 7 days, then 5 mg BID (low-risk); [[Alteplase]] 100 mg IV over 2 hours (high-risk with hemodynamic instability)
AltAlternatives[[Rivaroxaban]] 15 mg BID for 21 days then 20 mg daily; [[Enoxaparin]] 1 mg/kg SC BID; [[Unfractionated heparin]] 80 U/kg bolus + 18 U/kg/h (for high-risk or peri-thrombolysis)
⊘AvoidNon-dihydropyridine CCBs (diltiazem, verapamil); routine systemic thrombolysis for intermediate-risk PE; warfarin in first trimester of pregnancy; DOACs during pregnancy
DxTest of choiceCT pulmonary angiography (CTPA) with RV/LV ratio assessment; for low pretest probability, D-dimer with age-adjusted cutoff (age × 10 μg/L) followed by PERC rule
ScKey score[[sPESI]]: 1 point each for age >80, cancer, chronic cardiopulmonary disease, HR ≥110, SBP <100, SpO2 <90%. Score 0 = 30-day mortality <1% (outpatient eligible); score ≥1 = increased risk.
→When to referActivate PERT for intermediate- or high-risk PE; consult interventional cardiology/radiology for catheter-directed therapy; ICU for vasopressors or ECMO; surgery for embolectomy if thrombolysis contraindicated
Stratify by hemodynamics, RV function, and biomarkers. High-risk: thrombolysis within 30 minutes. Intermediate-risk: anticoagulation + PERT; consider catheter-directed therapy. Low-risk: early discharge on DOAC.
Pulmonary embolism (PE) is a potentially fatal cardiovascular emergency caused by occlusion of pulmonary arteries by thrombus, most often from lower extremity deep venous thrombosis. The clinical spectrum ranges from asymptomatic subsegmental clots to obstructive shock and cardiac arrest. Immediate risk stratification using validated tools (sPESI, Hestia criteria) and bedside assessment of right ventricular function determines the urgency of anticoagulation, need for reperfusion therapy, and disposition. In low-risk patients, early discharge on a direct oral anticoagulant is safe and effective; in high-risk patients, systemic thrombolysis within 30 minutes reduces mortality. The age-adjusted D-dimer cutoff (age × 10 μg/L) and clinical decision rules (PERC, YEARS) safely reduce unnecessary imaging.

Overview and Recommendations

Background

  • •Pulmonary embolism (PE) accounts for approximately one-third of the 600,000 annual venous thromboembolism events in the United States, with a 30-day mortality of 1% in low-risk patients but exceeding 30% in untreated high-risk disease. The four pillars of modern management, risk-stratified anticoagulation, selective thrombolysis, catheter-directed therapies, and early discharge pathways, replaced the legacy approach of heparin-warfarin for all, following landmark trials such as PEITHO (2014), EINSTEIN-PE (2012), and COBRRA (2026).
  • •The pathophysiology hinges on acute right ventricular (RV) pressure overload from mechanical obstruction and neurohormonal activation (RAAS, sympathetic), which together cause RV dilation, septal bowing, and reduced left ventricular preload, the final common pathway to obstructive shock. The degree of RV dysfunction is the strongest predictor of short-term mortality, independent of clot burden.
  • •Incidence rises sharply with age: 0.06% in ED patients aged 18-35 years versus 0.60% in those >65 years. Strong provoking factors include active cancer (OR 4.0-7.0), major orthopaedic surgery (RR 61 in women 50-64), and COVID-19 in the first week after infection (IRR 36.17). Obesity, glucocorticoid use, and oral contraceptives are modifiable risk factors.
  • •The 2026 AHA/ACC Acute PE Clinical Categories replaced older massive/submassive nomenclature with a four-tier system integrating hemodynamic status, RV function, and biomarkers. High-risk PE (sustained hypotension or vasopressor need) mandates immediate systemic thrombolysis; intermediate-risk PE (normotensive with RV dysfunction) may benefit from catheter-directed therapy; low-risk PE (no RV strain, normal biomarkers) is suitable for early discharge on a DOAC.

Evaluation

  • •Suspect PE in any patient with acute dyspnea, pleuritic chest pain, syncope, or unexplained hypoxemia, especially when risk factors (cancer, recent surgery, immobilization, estrogen use, obesity) are present. Dyspnea is the most common symptom (>80%), but the classic triad of dyspnea, chest pain, and hemoptysis occurs in fewer than 20% of confirmed cases.
  • •Ask about the timing and progression of symptoms, prior VTE, active malignancy, recent surgery or trauma, pregnancy or postpartum state, and use of hormonal contraceptives or testosterone. Syncope at presentation carries a nearly 2-fold increase in short-term mortality (OR 1.82) and signals high-risk disease.
  • •Examine for tachycardia (HR >100/min in 38%), tachypnea, hypoxemia (SpO2 <94% on room air), and signs of RV strain: elevated jugular venous pressure, right ventricular heave, loud P2, and tricuspid regurgitation murmur. Unilateral leg edema or cord suggests concomitant DVT. Hypotension (SBP <90 mmHg) defines high-risk PE and mandates immediate imaging.
  • •Obtain a 12-lead ECG: sinus tachycardia is most common; S1Q3T3 pattern, complete RBBB, T-wave inversion in V1-V4, and ST elevation in aVR each predict hemodynamic collapse or death. Perform point-of-care ultrasound (POCUS) to assess for RV dilation, McConnell’s sign (RV free wall akinesis with apical sparing), and septal bowing, highly specific for severe RV dysfunction.
  • •Use a validated clinical decision rule (CDR) to quantify pretest probability. The Wells score (dichotomized: PE unlikely ≤4, likely >4) and revised Geneva score are most studied. In low gestalt probability, apply the PERC rule (8 criteria: age >50, HR >100, sat <95%, prior DVT/PE, surgery, hemoptysis, estrogen use, unilateral leg swelling). A negative PERC (0 items) has a sensitivity of 97% and a negative LR of 0.17, safely deferring D-dimer and imaging.
  • •If PERC positive or moderate/high probability, order a D-dimer with age-adjusted cutoff: for patients aged ≥50 years, use a threshold of age × 10 μg/L (e.g., 750 μg/L for a 75-year-old). This increases the proportion of negative D-dimer from 6.4% to 29.7% in patients ≥75 without false negatives. The YEARS algorithm (three items: clinical signs of DVT, hemoptysis, PE most likely diagnosis) uses variable D-dimer thresholds: <1000 ng/mL if 0 items, <500 ng/mL if ≥1 item, reducing CT angiography by 48%.
  • •If D-dimer is positive, proceed to CT pulmonary angiography (CTPA). CTPA alone has sensitivity 83% and specificity 96%; combined CT-venography raises sensitivity to 90%. A negative CTPA with negative leg ultrasound has a 3-month failure rate of 1.5%. In patients with contraindications to contrast (pregnancy, renal failure), use ventilation-perfusion (V/Q) scanning. CTPA yields indeterminate results in 24.7% of non-positive studies, requiring alternative imaging.
  • •Assess RV function on CTPA (RV/LV ratio ≥1.0) and measure cardiac biomarkers (troponin, BNP/NT-proBNP). Elevated troponin >0.07 ng/mL has specificity 93% for RV dysfunction; BNP ≥90 pg/mL has sensitivity 88%. In normotensive patients, negative biomarkers combined with sPESI = 0 confer negligible risk of adverse events, supporting outpatient eligibility.
  • •Diagnostic criteria: The diagnosis of PE is confirmed by CTPA showing a filling defect in the pulmonary arterial tree, or by a high-probability V/Q scan. In patients with a low clinical probability and a negative D-dimer, PE is ruled out without imaging. The acceptable posttest failure rate is <3% at 3 months.
  • •Also consider alternative diagnoses that mimic PE: acute coronary syndrome (ECG, troponin), aortic dissection (severe tearing pain, CT angiography), cardiac tamponade (POCUS, pulsus paradoxus), tension pneumothorax (absent breath sounds, tracheal deviation), and sepsis (fever, lactate, source). In pregnant patients, peripartum cardiomyopathy should be considered if echocardiography shows LV systolic dysfunction.
  • •Must-not-miss: massive PE with obstructive shock can present with normal initial imaging if clinical suspicion is high, repeat POCUS or CTPA. Right ventricular infarction can mimic PE with hypotension and elevated JVP; ECG shows ST elevation in II, III, aVF and V4R. Anaphylaxis presents with urticaria, wheezing, and response to epinephrine.

Management

  • •Initiate therapeutic anticoagulation immediately after PE is confirmed, unless contraindicated. For high-risk PE (SBP <90 mmHg), use unfractionated heparin (UFH) 80 U/kg IV bolus, then 18 U/kg/h infusion, because it can be rapidly reversed if thrombolysis is needed. For intermediate- and low-risk PE, prefer low-molecular-weight heparin (LMWH) or a direct oral anticoagulant (DOAC).
  • •First-line DOACs: 10 mg PO BID for 7 days, then 5 mg BID; or 15 mg PO BID for 21 days, then 20 mg daily. In the COBRRA trial (2026), apixaban caused less clinically relevant bleeding than rivaroxaban (3.3% vs 7.1%; RR 0.46). For patients with cancer-associated VTE, apixaban is noninferior to dalteparin (Caravaggio trial).
  • •For high-risk PE, administer systemic thrombolysis without delay: 100 mg IV over 2 hours. Door-to-needle time should be <30 minutes, ideally <15 minutes. Thrombolysis reduces all-cause mortality from 3.9% to 2.2% (NNT 59) but increases major bleeding (NNH 18) and intracranial hemorrhage (NNH 78). In PE-related cardiac arrest, thrombolysis may be considered during CPR (OR 12.5 for survival).
  • •Avoid half-dose alteplase (50 mg) outside of selected high-bleeding-risk patients, it is not guideline-recommended for high-risk PE. Full-dose thrombolysis is standard. If contraindicated, pursue mechanical embolectomy or catheter-directed therapy emergently.
  • •For intermediate-risk PE with RV dysfunction and clinical deterioration, activate the Pulmonary Embolism Response Team (PERT) and consider catheter-directed therapy. The PEERLESS trial (2024) showed large-bore mechanical thrombectomy reduced clinical deterioration and ICU admissions compared to catheter-directed thrombolysis (win ratio 5.01). The HI-PEITHO trial (2026) demonstrated ultrasound-facilitated catheter-directed fibrinolysis reduced the composite of PE-related death, decompensation, or recurrence at 7 days (4.0% vs 10.3%; NNT 16).
  • •For refractory cardiac arrest due to massive PE, initiate veno-arterial ECMO (VA-ECMO) if available. Systematic review shows 61% survival to discharge; age >65 years and cannulation during ongoing CPR increase risk of death. Combine ECMO with reperfusion (thrombolysis or embolectomy), mortality is lower than ECMO alone.
  • •Titrate vasopressors to maintain mean arterial pressure >65 mmHg: is first-line for RV failure (0.05-0.3 μg/kg/min). Avoid epinephrine in onco-hematologic patients with cardiogenic shock (OR 2.09 for mortality). Dobutamine (2-20 μg/kg/min) or milrinone (0.125-0.75 μg/kg/min) may be added as inotropes for RV dysfunction. Inhaled nitric oxide (20-40 ppm) or epoprostenol can reduce pulmonary vascular resistance.
  • •Monitor for bleeding: with thrombolysis, major bleeding occurs in 6.3% (intermediate-risk) to 9.2% (all-comers). Intracranial hemorrhage risk is 1.5% with full-dose alteplase. Have reversal agents available: protamine for UFH, andexanet alfa for apixaban/rivaroxaban, but note that reversal is not always effective for DOACs in the setting of thrombolysis.
  • •For intubation, use a strategy to minimize peri-intubation hemodynamic collapse: preload with IV fluids cautiously (guided by congestion markers), prepare vasopressors, and induce with ketamine 1-2 mg/kg IV (avoid propofol). After intubation, use low tidal volume ventilation (6 mL/kg PBW) with plateau pressure <30 cm H2O and low PEEP (≤5 cm H2O) to limit RV afterload.
  • •What NOT to do: Do not use non-dihydropyridine CCBs (diltiazem, verapamil), they worsen RV failure. Do not administer routine inferior vena cava filters unless anticoagulation is contraindicated. Do not start prolonged bed rest, early ambulation is safe and recommended. Do not give systemic thrombolysis to normotensive intermediate-risk patients (after PEITHO, the bleeding risk outweighs the benefit except in selected cases).
  • •When to refer: Activate PERT for any intermediate- or high-risk PE, especially if RV dysfunction, clinical deterioration, or need for advanced therapies. Refer to interventional cardiology or radiology for catheter-directed therapy if thrombolysis is contraindicated or fails. Consult ICU for high-risk patients requiring vasopressors or ECMO.
  • •Discharge criteria for low-risk PE: sPESI = 0, no RV dysfunction on echo or CT, normal biomarkers, Hestia criteria negative, and safe home environment. First dose of DOAC administered in ED. Arrange follow-up within 2-5 weeks. Provide return precautions: bleeding, worsening dyspnea, chest pain, syncope. Acceptable post-discharge adverse event rate <2% within 7 days. Home discharge reduces hospital length of stay by a median of 28 hours.
  • •For extended anticoagulation after provoked PE, continue for 3 months; for unprovoked PE, consider extended therapy with reduced-dose DOACs (apixaban 2.5 mg BID or rivaroxaban 10 mg daily) after 6 months (RENOVE trial). In cancer-associated PE, extend anticoagulation for at least 18 months while cancer is active (ONCO-PE trial).
  • •Special populations: In pregnancy, use LMWH (enoxaparin 1 mg/kg SC BID), DOACs and warfarin are contraindicated. In elderly, apply age-adjusted D-dimer and use DOACs with dose adjustment for renal function (apixaban 2.5 mg BID if CrCl <30 mL/min). In pediatrics, treatment is with LMWH or UFH (weight-based); DOACs are not approved.
  • •Monitor for complications: contrast-induced nephropathy (14% after CTPA), hydrate with normal saline, use low-osmolar contrast. Peri-intubation instability (51% require increased vasopressors within 3 hours), prepare ECMO backup. Delayed diagnosis (12% of initial ED visits), use structured CDR and maintain high index in atypical presentations.

Board Review — High Yield

  • •S1Q3T3 pattern, Classic ECG finding in PE, but present in only 9% of confirmed cases; positive LR 3.7. More common signs: sinus tachycardia, T-wave inversion V1-V4.
  • •McConnell’s sign, POCUS finding: RV free wall akinesis with apical sparing. Highly specific for acute PE (sensitivity 100% in normotensive patients with RV dysfunction).
  • •sPESI = 0, 30-day mortality <1%. Patients with score 0, no RV dysfunction, and normal biomarkers are candidates for outpatient management. This is the most validated triage tool.
  • •Age-adjusted D-dimer, For patients ≥50 years, use cutoff = age × 10 μg/L. Increases proportion of negative D-dimer from 6.4% to 29.7% in those ≥75 without false negatives (ADJUST-PE).
  • •PERC rule, 8 criteria: age >50, HR >100, sat <95%, prior DVT/PE, surgery, hemoptysis, estrogen use, unilateral leg swelling. Negative PERC (0 items) has sensitivity 97%, can safely defer D-dimer.
  • •PEITHO trial, In intermediate-risk PE, tenecteplase reduced death or decompensation (2.6% vs 5.6%) but increased major bleeding (6.3% vs 1.2%) and ICH (2.0% vs 0.2%). Systemic thrombolysis is not recommended for this group.
  • •HI-PEITHO trial (2026), Ultrasound-facilitated catheter-directed fibrinolysis + anticoagulation reduced 7-day composite of PE-related death, decompensation, or recurrence versus anticoagulation alone (4.0% vs 10.3%; NNT 16).
  • •COBRRA trial (2026), Apixaban had less clinically relevant bleeding than rivaroxaban (3.3% vs 7.1%) in acute VTE, establishing apixaban as the preferred DOAC for bleeding risk.
  • •Veno-arterial ECMO, 61% survival to discharge in massive PE with cardiac arrest. Age >65 and cannulation during CPR increase mortality. Combine with reperfusion (thrombolysis/embolectomy).
  • •Pregnancy PE, Yield of diagnostic testing is only 4.1% in pregnant ED patients (RR 0.60 vs non-pregnant). YEARS algorithm has limited sensitivity (58%). CTPA is used in 91% of cases; LMWH is anticoagulant of choice.

Deep Dive — Evidence Details

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