A 62-year-old woman with a history of metastatic ovarian cancer presents with acute dyspnea and syncope. Vital signs: HR 130/min, BP 88/54 mmHg, RR 28/min, SpO₂ 88% on room air, JVD present. Bedside echocardiography shows acute right ventricular dilatation and dysfunction. CTPA is not immediately available. What is the most appropriate immediate management?

Explanation

## Clinical Presentation: Massive PE This patient has **hemodynamic instability** (syncope, hypotension, tachycardia) and **right ventricular dysfunction** (confirmed on echo) — hallmarks of massive PE. The cancer history is a major thrombotic risk factor. Imaging confirmation is not required before treatment in this life-threatening scenario. ## Diagnostic Criteria for Massive PE | Feature | Present in This Case | |---------|----------------------| | Systolic BP < 90 mmHg | Yes (88 mmHg) | | Signs of RV dysfunction (echo, ECG) | Yes (RV dilatation) | | Syncope or altered mental status | Yes (syncope) | | Severe hypoxemia | Yes (SpO₂ 88%) | **Key Point:** Massive PE is a clinical diagnosis. Hemodynamic instability + RV dysfunction = treat immediately without waiting for CTPA. ## Management of Massive PE ### Immediate Steps 1. **Anticoagulation** — Unfractionated heparin (UFH) is preferred over LMWH in massive PE because: - Shorter half-life (reversible if bleeding occurs) - Can be rapidly reversed with protamine - Allows for thrombolysis if needed 2. **Thrombolysis** — Indicated in massive PE with hemodynamic instability: - Alteplase 100 mg IV over 2 hours (or accelerated regimen) - Reduces mortality and improves hemodynamics - Contraindications must be assessed (active bleeding, recent surgery, stroke) 3. **Supportive care** — Oxygen, IV fluids cautiously (RV is preload-sensitive) ### Why NOT Vasopressors Alone **Clinical Pearl:** Norepinephrine without anticoagulation and thrombolysis is temporizing and dangerous—the underlying thromboembolism will progress, leading to death. Vasopressors are adjunctive only. ## Management Algorithm for PE ```mermaid flowchart TD A[Suspected PE]:::outcome --> B{Hemodynamically stable?}:::decision B -->|Yes| C[CTPA for confirmation]:::action B -->|No| D{RV dysfunction on echo/ECG?}:::decision D -->|Yes| E[Massive PE]:::urgent D -->|No| F[Submassive PE]:::outcome E --> G[Start UFH bolus + infusion]:::action G --> H[Thrombolysis if no contraindications]:::action H --> I[Supportive care: O₂, fluids, vasopressors if needed]:::action F --> J[Anticoagulation + monitor closely]:::action ``` **High-Yield:** UFH is preferred over LMWH in massive PE because it is reversible and allows rapid escalation to thrombolysis or IVC filter placement if needed. **Mnemonic: MASSIVE PE** — **M**assive hemoptysis/hypotension, **A**cute RV strain, **S**yncope, **S**evere hypoxemia, **I**nstability, **V**entricular dysfunction, **E**mergency thrombolysis.