A 62-year-old man with COPD and atrial fibrillation (not on anticoagulation) presents with acute worsening of dyspnea, hemoptysis, and right-sided pleuritic chest pain. Vital signs: HR 118 bpm, BP 95/58 mmHg, RR 32/min, SpO₂ 85% on supplemental oxygen. Unilateral leg swelling is absent. Bedside echocardiography shows dilated right ventricle with reduced systolic function. Troponin-I is elevated at 0.18 ng/mL (normal <0.04). What is the most likely diagnosis and the immediate next step?

Explanation

## Clinical Presentation and Diagnosis **Key Point:** This patient presents with **massive PE** — defined by hemodynamic instability (hypotension, shock) with evidence of acute right ventricular dysfunction and myocardial injury. **High-Yield:** The triad of hemodynamic instability (BP 95/58), RV dilatation on echo, and elevated troponin in the setting of acute dyspnea, hemoptysis, and pleuritic chest pain is pathognomonic for massive PE with RV infarction. ## Diagnostic Criteria for Massive PE | Feature | This Patient | Significance | |---------|--------------|---------------| | Systolic BP | <90 mmHg (95/58) | Shock present | | RV function | Dilated with reduced systolic function | RV strain/infarction | | Troponin | 0.18 ng/mL (elevated) | Myocardial injury | | SpO₂ | 85% on supplemental O₂ | Severe hypoxemia | | Risk factors | COPD, Afib (immobility risk) | Predisposing | **Clinical Pearl:** Hemoptysis in PE occurs when pulmonary infarction develops (wedge-shaped hemorrhagic consolidation). It signals a more severe, distal embolism with compromised bronchial circulation. ## Management of Massive PE ```mermaid flowchart TD A[Massive PE: Shock + RV dysfunction]:::urgent --> B{Imaging available immediately?}:::decision B -->|Yes, CTPA feasible| C[Urgent CTPA confirmation]:::action B -->|No, or unstable| D[Empirical thrombolysis]:::action C --> E[Thrombolysis or embolectomy]:::urgent D --> E E --> F[ICU monitoring + anticoagulation]:::action ``` **High-Yield:** In **hemodynamically unstable PE** (massive PE), thrombolysis or surgical/catheter embolectomy is indicated *without waiting for CTPA confirmation* if imaging will delay treatment. This patient's shock state and RV dysfunction warrant immediate reperfusion therapy. **Mnemonic: MASSIVE PE criteria** — **M**yocardial injury (troponin ↑), **A**cute RV dysfunction (echo), **S**ystolic BP <90, **S**evere hypoxemia, **I**nstability (shock), **V**entricular strain, **E**mergency thrombolysis. ## Why Not the Other Options? - **Acute decompensated heart failure:** Would present with bilateral crackles, elevated JVP, and pulmonary edema on CXR — not unilateral pleuritic pain or hemoptysis. - **ACS with cardiogenic shock:** ACS rarely causes isolated RV dilatation; coronary angiography would delay life-saving thrombolysis in confirmed PE. - **COPD exacerbation with cor pulmonale:** Cor pulmonale develops chronically; acute hemoptysis, pleuritic pain, and shock are not typical of COPD exacerbation alone. [cite:Harrison 21e Ch 297]