Clinical Reasoning and Priority Setting
This question tests your ability to recognize a life-threatening postoperative complication and prioritize nursing actions. After a total hip replacement (THR), patients are at significant risk for venous thromboembolism (VTE), including deep vein thrombosis (DVT) and its most lethal sequela, pulmonary embolism (PE). While all the options represent abnormal findings, you must differentiate between a common, expected postoperative concern and a rapidly fatal emergency.
Analysis of the Correct Answer (Option 4)
The sudden onset of severe dyspnea, chest pain, and hemoptysis is the classic clinical triad for an
acute pulmonary embolism (APE), although the triad is not always present in its entirety. This presentation indicates a large, hemodynamically significant embolus has traveled from a deep vein, likely in the operative leg, and lodged in the pulmonary vasculature. This is the most concerning finding because APE is a life-threatening condition that can lead to obstructive shock and cardiac arrest within minutes
[3]. Immediate intervention—including high-flow oxygen administration, notification of the rapid response team, and preparation for emergent diagnostic testing and anticoagulation—is required to prevent mortality.
Analysis of Incorrect Options
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Option 1: An oxygen saturation of
94% on room air with mild shortness of breath is a common postoperative finding. Atelectasis, the effects of anesthesia, and pain can all contribute to this. While it requires nursing intervention, such as incentive spirometry and mobilization, it is not immediately life-threatening compared to a massive PE.
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Option 2: Calf pain and swelling in the operative leg with a positive Homan's sign is highly suggestive of a
deep vein thrombosis (DVT). This is a serious complication that requires prompt intervention to prevent progression to a PE. Prophylactic anticoagulation, with agents like low-molecular-weight heparin (LMWH) or aspirin, is a standard of care after THR precisely to prevent this . However, a DVT itself is not as acutely life-threatening as a PE that has already occurred and is causing severe respiratory and cardiovascular symptoms. The presence of a DVT makes the findings in Option 4 even more likely.
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Option 3: A heart rate of
102 bpm with chest discomfort is a concerning but nonspecific finding. Tachycardia can be a sign of pain, anxiety, hypovolemia, or a developing PE. While this patient requires a thorough assessment, the sudden, severe, and classic presentation in Option 4 represents a more definitive and critical emergency that demands the nurse's immediate attention.
Pathophysiology and Clinical Integration
The connection between these options lies in the pathophysiology of VTE. Orthopedic surgeries like THR fulfill all three components of Virchow's triad: venous stasis from immobility, endothelial injury from the surgery itself, and a hypercoagulable state postoperatively. This makes VTE a primary concern, and research consistently focuses on comparing prophylactic strategies to mitigate this risk [1,2]. A DVT (Option 2) is the source of the embolus. When a thrombus dislodges and travels to the lungs, it creates a ventilation-perfusion (V/Q) mismatch and increases pulmonary vascular resistance, leading to the sudden hypoxemia, chest pain from pulmonary infarction, and hemoptysis described in Option 4. The study on APE confirms that this condition demands precise and immediate risk stratification due to its high potential for early mortality
[3].
References (research sources)