Source / episode info
- **Episode:**339
- **Title:**Divine Intervention Episode 339 – The HY Pulmonary Embolism Podcast
- **Published:**2021-09-08
- Source:Episode page
One-liner
This episode provides a comprehensive review of Pulmonary Embolism (PE), covering its pathophysiology via Virchow's Triad, the diagnostic algorithm using D-dimer and CT angiography, management with anticoagulants (LMWH vs. UFH), and specific considerations for special populations like pregnancy.
High-yield summary
- Virchow's Triad: The three components of VTE risk are stasis (e.g., long immobility, bedrest), hypercoagulability (e.g., Factor V Leiden, Antithrombin III deficiency), and endothelial injury (e.g., surgery, trauma).
- PE Presentation: PE is an acute event; the most common EKG finding is sinus tachycardia. The associated pleural effusion is typically exudative (E in PE -> Exudative).
- Diagnostic Algorithm: For low clinical probability, a normal D-dimer can rule out PE. For high clinical probability, proceed directly to CT Pulmonary Angiogram (CTPA), regardless of the D-dimer result.
- Anticoagulation Choice: Standard therapy is Low Molecular Weight Heparin (LMWH). Use Unfractionated Heparin (UFH) specifically in patients with renal dysfunction.
- Thrombolytics (TPA): Reserved for life-threatening PE, specifically when the patient is hemodynamically unstable or shows definitive signs of right ventricular failure.
- Special Populations: In pregnant women and those on Combined Oral Contraceptives (COCPs), prophylactic anticoagulation with Heparin (LMWH/UFH) is mandatory.
Learning objectives
- Describe the pathophysiology of PE using Virchow's Triad (stasis, hypercoagulability, endothelial injury).
- Differentiate between low-risk and high-risk patients for PE to guide diagnostic testing (D-dimer vs. CTPA).
- Select the appropriate anticoagulant based on renal function (LMWH vs. UFH) and patient status (pregnancy/COCPs).
- Recognize the clinical signs of massive PE, including hemodynamic instability and right ventricular failure.
- Classify pleural effusions associated with PE as exudative rather than transudative.