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?

Question

Accepted Answer

A. Start unfractionated heparin 80 U/kg IV bolus followed by infusion and consider thrombolysis. ## 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.

Answer

B. Perform urgent lower limb venography to confirm DVT source

Answer

C. Initiate norepinephrine infusion and defer anticoagulation until imaging

Answer

D. Administer oxygen, observe for 2 hours, then reassess

Explanation

Clinical Presentation: Massive PE

Diagnostic Criteria for Massive PE

Management of Massive PE

Immediate Steps

Why NOT Vasopressors Alone

Management Algorithm for PE

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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%)