A nurse is caring for a client 2 days after total hip replacement surgery. Which assessment finding requires the nurse's immediate attention?

Sudden chest pain and shortness of breath indicate pulmonary embolism, a life-threatening post-op complication requiring immediate intervention. Other findings like mild pain or low-grade fever are expected and less urgent.

Understanding the Clinical Priority
The question presents a client in the early postoperative period following total hip replacement. This timeframe is critical because it represents the peak risk window for venous thromboembolism (VTE), a well-documented complication after major joint surgery. The nurse must rapidly differentiate between expected postoperative findings and a life-threatening emergency. While pain, wound drainage, and low-grade fever can be normal inflammatory or healing responses, a sudden onset of severe chest pain and shortness of breath points directly to a pulmonary embolism (PE), which requires immediate intervention to prevent hemodynamic collapse and death.

Why Sudden Chest Pain and Dyspnea is the Priority
This assessment finding is the classic presentation of a massive pulmonary embolism (PE). After a total hip replacement, venous stasis, endothelial injury from surgery, and a hypercoagulable state (Virchow's triad) create a perfect storm for deep vein thrombosis (DVT) formation. A thrombus that dislodges from the deep veins of the leg will travel through the right heart and lodge in the pulmonary arterial circulation. The sudden onset of severe chest pain and shortness of breath signals an acute obstruction of pulmonary blood flow. As described in the case report by Hoseini et al., massive PE is a life-threatening emergency with high mortality, often presenting with dyspnea, hypoxemia, and cardiogenic shock due to right ventricular strain ^[2]. The nurse's immediate attention is required to initiate life-saving measures, including oxygen administration, notifying the rapid response team, and preparing for potential thrombolytic therapy.

Analysis of Other Options
The other findings, while requiring nursing assessment and intervention, do not represent an immediate threat to airway, breathing, or circulation.

- Option 1 (Mild incisional pain): A pain rating of 4/10 is an expected finding 2 days after major surgery and can be managed with prescribed analgesics. It does not indicate a life-threatening complication.
- Option 3 (Knee swelling and drainage): While the ipsilateral knee swelling could raise suspicion for a DVT, the presence of moderate drainage from the surgical site is a common postoperative finding. A DVT would more classically present with unilateral leg pain, warmth, and edema without a direct link to surgical drainage. This finding requires further assessment but is not immediately life-threatening like a PE. The study by Li et al. confirms DVT is a major concern after total hip arthroplasty, but its presence alone, without embolization, does not constitute the most immediate emergency .
- Option 4 (Low-grade fever and fatigue): A temperature of 100.2°F (37.9°C) is a common inflammatory response to surgery and tissue healing. While it requires monitoring for potential infection, it is not an immediate, life-threatening crisis on postoperative day 2.

Pathophysiology and Clinical Correlation
The clinical urgency of option 2 is rooted in the hemodynamic consequences of a PE. When a large thrombus, such as a saddle pulmonary embolism, obstructs the main pulmonary artery, it causes a sudden increase in pulmonary vascular resistance. This leads to acute right ventricular failure, decreased left ventricular preload, and ultimately, systemic hypotension and cardiogenic shock. The case report by Dodge and Kang highlights that PE can present with sudden syncope, but the more classic and recognizable presentation in a postoperative patient is the one described in the question: sudden, severe chest pain and shortness of breath . This presentation demands immediate recognition because the therapeutic window for interventions like systemic thrombolysis is narrow ^[2].

Furthermore, the catastrophic potential of a massive DVT is illustrated by the rare condition of phlegmasia cerulea dolens (PCD), which involves near-complete venous outflow obstruction of a limb, leading to a risk of venous gangrene . While PCD is a local limb-threatening emergency, a PE represents a systemic, immediately life-threatening event where the obstruction is in the pulmonary circulation, directly compromising gas exchange and cardiac output. The nurse's ability to triage the PE as the highest priority is fundamental to safe postoperative care, as the failure of initial management can leave the patient with limited therapeutic options ^[2].