Episode 214: Acute Pulmonary Embolism

We review the diagnosis, risk stratification, & management of acute pulmonary embolism in the ED. Hosts: Vivian Chiu, MD Brian Gilberti, MD https://media.blubrry.com/coreem/content.blubrry.com/coreem/Acute_Pulmonary_Embolism.mp3 Download One Comment Tags: Pulmonary Show Notes Core Concepts and Initial Approach Definition: Obstruction of pulmonary arteries, usually from a DVT in the proximal lower extremity veins (iliac/femoral), but may be tumor, air, or fat emboli. Incidence & Mortality: 300,000–370,000 cases/year in the USA, with 60,000–100,000 deaths annually. Mantra: “Don’t anchor on the obvious. Always risk stratify and resuscitate with precision .” Risk Factors: Broad, including older age, inherited thrombophilias, malignancy, recent surgery/trauma, travel, smoking, hormonal use, and pregnancy. Clinical Presentation and Risk Stratification Presentation: Highly variable, showing up as anything from subtle shortness of breath to collapse. Acute/Subacute: Dyspnea (most common), pleuritic chest pain, cough, hemoptysis, and syncope. Patients are likely tachycardic, tachypneic, hypoxemic on room air, and may have a low-grade fever. Chronic: Can mimic acute symptoms or be totally asymptomatic. Pulmonary Infarction Signs: Pleuritic pain, hemoptysis, and an effusion. High-Risk Red Flags: Signs of hypotension (systolic blood pressure PERT team immediately. Crucial Mimics: Think broadly; consider pneumonia, ACS, pneumothorax, heart failure exacerbation, and aortic dissection. Workup & Diagnostics History/Scoring: Ask about prior clots, recent surgeries, hospitalizations, travel. Use Wells/PERC criteria to assess pretest probability. Labs: D-dimer: A good test to rule out PE in a patient with low probability . If suspicion is high, proceed directly to imaging. Troponin/BNP: Act as RV stress gauges . Elevated levels are associated with increased risk of a complicated clinical course (25-40%). Lactate: Helpful in identifying patients in possible cardiogenic shock. EKG: Most common finding is sinus tachycardia . Classic RV strain patterns (S 1 Q 3 T 3 , T-wave changes/inversions) are nonspecific. Imaging: CXR: Usually normal, but quick and essential to rule out other causes. CTPA: The usual standard and gold standard for stable patients . High sensitivity (> 95%) and can detect RV enlargement/strain. V/Q Scan: Option for patients with contraindications to contrast (e.g., severe contrast allergies). POCUS (Point-of-Care Ultrasound): Useful adjunct for unstable patients. Bedside Echo: Can show signs of RV strain (enlarged RV, McConnell sign). Lower Extremity Ultrasound: Can identify a DVT in proximal leg veins. Treatment & Management Resuscitation (Reviving the RV): Oxygenation: Give supplementally as needed (nasal cannula, non-rebreather, high flow). Intubation: Avoid if possible ; positive pressure ventilation can worsen RV dysfunction. Fluids: Be judicious ; even the smallest amount can worsen RV overload. Vasopressors: Norepinephrine is preferred as first-line for hypotension/shock. Anticoagulation (Start Immediately): Initial choice is UFH or LMWH (Lovenox) . Lovenox is preferred for quicker time to therapeutic range, but is contraindicated in renal dysfunction, older age, or need for emergent procedures. DOACs can be considered for stable, low-risk patients as an outpatient. Escalation for High-Risk PE Systemic Thrombolytics: Consider for very sick patients with shock/cardiac arrest (e.g., Alteplase 100 mg over two hours or a bolus in cardiac arrest). High risk of intracranial hemorrhage; weigh risks versus benefits. PERT Activation: Engage multidisciplinary teams (usually including ICU, CT surgery, and interventional radiology). Interventions: Consult specialists for catheter-directed thrombolysis or suction embolectomy . Surgical embolectomy can also be considered. Bridge to Care: Activate the ECMO team early for unstable patients to buy valuable time. Prognosis & Disposition Mortality: Low risk Complications: 3-4% of patients de

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