A 32-year-old postpartum client on her third day after vaginal delivery suddenly develops shortness of breath, chest pain, and anxiety. Her vital signs are: BP 90/60 mmHg, HR 120 bpm, RR 28/min, O2 sat 88% on room air. Which assessment finding would be MOST indicative of pulmonary embolism in this client?

Unilateral leg swelling with positive Homan's sign indicates DVT, the primary risk for PE in postpartum clients. Other findings suggest pneumonia or normal status, not PE.

Understanding the Clinical Presentation

The scenario describes a classic high-risk presentation for pulmonary embolism (PE) in a postpartum client. The combination of sudden-onset shortness of breath, chest pain, anxiety, tachypnea (RR 28/min), tachycardia (HR 120 bpm), hypotension (BP 90/60 mmHg), and significant hypoxemia (O2 sat 88%) points toward a massive or high-risk PE, which is a leading cause of maternal mortality in the postpartum period ^[1]. In this context, identifying the most indicative assessment finding requires linking the pathophysiology of venous thromboembolism (VTE) to its clinical signs.

Analysis of the Correct Answer (Option 2)

Unilateral leg swelling with a positive Homan's sign is the most indicative finding. The underlying pathophysiology of PE in this population almost always begins with a deep vein thrombosis (DVT), typically originating in the lower extremities. Postpartum women are at a significantly increased risk for VTE due to Virchow's triad: venous stasis, hypercoagulability, and endothelial injury sustained during delivery ^[2]. A thrombus that forms in the deep veins of the leg can dislodge and travel to the pulmonary arteries, causing the life-threatening obstruction you see in the client's vital signs. Therefore, clinical evidence of a DVT—such as unilateral leg swelling, pain, warmth, or a positive Homan's sign—provides the strongest bedside clue that the source of the embolus is a venous thrombus, making PE the most likely diagnosis. While Homan's sign has limited sensitivity and specificity on its own, in the presence of a high pre-test probability presentation like this, it reinforces the clinical suspicion for VTE.

Analysis of Incorrect Answers

Option 1: Bilateral crackles in lung bases with productive cough is a hallmark of cardiogenic pulmonary edema or pneumonia, not an acute PE. While a massive PE can eventually cause right ventricular failure and pulmonary congestion, the sudden onset and the presence of clear risk factors for VTE make a primary cardiac or infectious etiology less likely. The finding is bilateral and associated with airway secretions, which does not localize to a thromboembolic source.

Option 3: Fever of 101.5°F (38.6°C) with purulent sputum is highly suggestive of an infectious process like pneumonia or endometritis, which can be a concern in a postpartum client. While PE can sometimes cause a low-grade fever, a high fever with purulent sputum points away from a sterile thromboembolic event and toward an infection. This finding does not indicate a VTE source.

Option 4: Symmetrical chest expansion with clear breath sounds is a normal respiratory assessment. In a client with significant hypoxemia and respiratory distress, this finding might be seen in conditions that do not involve airway obstruction or consolidation, such as PE, but it is a non-specific finding. It does not provide a positive indicator that the problem is a PE originating from a venous thrombus. The question asks for the finding most indicative of PE, which requires a positive sign of VTE, not just the absence of other lung pathology.

Pathophysiology and Risk Context

The postpartum period represents a state of profound hypercoagulability. Research indicates that standard D-dimer cut-offs, a biomarker for fibrin degradation, are not applicable in this population because D-dimer levels are physiologically elevated during pregnancy and the immediate postpartum period, even in the absence of an acute thromboembolic event . This underscores why clinical assessment for a source DVT is paramount. A massive PE, as described in the case report, can lead to a sudden reduction in cardiac output and transient cerebral hypoperfusion, which may manifest as syncope or even cardiac arrest ^[1]. The hypotension and tachycardia in this client are signs of right ventricular strain and obstructive shock, a high-risk feature that demands immediate recognition of the likely embolic source. The systematic review confirms that postpartum women are at an increased risk of VTE, and clinical factors remain the cornerstone of initial risk assessment, which includes looking for signs of DVT ^[2].