# A nurse is assessing a 68-year-old patient who underwent total hip replacement surgery 3 days ago. Which assessment finding would be the MOST concerning and require immediate intervention for suspected pulmonary embolism?

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## 문제

A nurse is assessing a 68-year-old patient who underwent total hip replacement surgery 3 days ago. Which assessment finding would be the MOST concerning and require immediate intervention for suspected pulmonary embolism?

## 보기

1. Oxygen saturation of 94% on room air with mild shortness of breath
2. Heart rate of 102 bpm with complaints of chest discomfort
3. Respiratory rate of 24 breaths per minute with anxiety
4. Sudden onset of severe dyspnea with pleuritic chest pain and hemoptysis **✔ 정답**

**정답: 4**

## 해설

Sudden severe dyspnea with pleuritic chest pain and hemoptysis is the classic triad of massive PE requiring immediate emergency intervention. Other options represent less severe findings manageable with standard monitoring.

## 심화 해설

Clinical Reasoning and Prioritization

This question tests your ability to recognize the classic, most severe presentation of a pulmonary embolism (PE) in a high-risk postoperative patient. After total hip replacement, patients are at significant risk for venous thromboembolism (VTE), including deep vein thrombosis (DVT) and PE, due to venous stasis, endothelial injury from surgery, and a hypercoagulable state. The key to answering this question is distinguishing between signs that are concerning but nonspecific and a presentation that signals a massive, immediately life-threatening embolic event.

Analysis of the Correct Answer

Option 4 is the correct choice because it describes the classic triad for a massive or high-risk pulmonary embolism: sudden onset of severe dyspnea, pleuritic chest pain, and hemoptysis. The presence of hemoptysis indicates pulmonary infarction, where the blockage of pulmonary blood flow by an embolus has led to tissue necrosis and alveolar hemorrhage. This combination of symptoms suggests a large, central embolus causing significant hemodynamic strain on the right ventricle. As noted in the literature, the obstruction of small blood vessels by emboli triggers a cascade that can lead to organ dysfunction, and a massive PE can precipitate acute right ventricular failure [2]. This is a "cannot wait" emergency requiring immediate escalation, notification of the rapid response team, and preparation for interventions like anticoagulation or, in cases of refractory shock, advanced support such as veno-arterial extracorporeal membrane oxygenation (V-A ECMO) [1].

Analysis of Incorrect Options

- Option 1 (Oxygen saturation of 94% on room air with mild shortness of breath): While a mild drop in oxygen saturation and dyspnea are common and concerning in the postoperative setting, they are not the most concerning findings. These could be attributed to atelectasis, pain, or a small, non-massive PE. This finding warrants thorough investigation, including a comparison to baseline and an assessment for other signs, but it does not immediately scream "massive PE" like the signs in Option 4.

- Option 2 (Heart rate of 102 bpm with complaints of chest discomfort): Tachycardia is a sensitive but nonspecific finding. Postoperative pain, anxiety, hypovolemia, or a developing infection can all cause a heart rate of 102 bpm. Chest discomfort is also a red flag, but its description is vague. It lacks the specific, sharp, breathing-related quality (pleuritic) and the definitive sign of infarction (hemoptysis) that pinpoint a severe PE.

- Option 3 (Respiratory rate of 24 breaths per minute with anxiety): Tachypnea and anxiety are common early signs of a PE due to hypoxemia and the sensation of air hunger. However, like the findings in Options 1 and 2, they represent a spectrum of severity. A patient with a small PE, atelectasis, or even just significant postoperative pain could present this way. This finding requires a prompt workup, but it does not carry the same immediate, life-threatening urgency as the sudden onset of severe dyspnea with hemoptysis.

Pathophysiology and Clinical Application

The clinical presentation of a PE exists on a spectrum. A small, distal embolus may cause only pleuritic pain and mild dyspnea. A massive, central "saddle" embolus, however, obstructs a large portion of the pulmonary arterial circulation. This leads to a sudden increase in pulmonary vascular resistance, causing acute right ventricular strain and failure, which is the primary cause of death in massive PE [1]. The classic triad in Option 4—severe dyspnea, pleuritic pain, and hemoptysis—is pathognomonic for a pulmonary infarction secondary to a more proximal embolus. In the context of a patient 3 days post-total hip replacement, a procedure with a known risk for VTE, this presentation is a clinical emergency. The study comparing anticoagulation strategies after total hip replacement underscores the reality of this risk and the critical need for both prevention and rapid recognition of breakthrough events . Furthermore, it is crucial to remember that while a DVT is the most common source, a PE can occur without sonographic evidence of a DVT, as the entire thrombus may have embolized to the lungs, making clinical assessment skills paramount .References (research sources)

- [1]Intraoperative Fat Embolism Syndrome Causing Acute Right Ventricular Failure Successfully Treated With Veno-Arterial Extracorporeal Membrane Oxygenation: A Case Report.Case reportMabuchi S, Miyawaki I. (2026) · DOI: 10.7759/cureus.102383

- [2]Pulmonary Fat Embolism After Fat Grafting.Research articleLu X, Zhu H, Li Y. (2025) · DOI: 10.3390/diagnostics15243214

## 임상 시나리오

Recognizing a Massive Pulmonary EmbolismClassic Triad in a High-Risk Postoperative Patient
The most critical presentation of a pulmonary embolism (PE) is the classic triad: sudden onset of severe dyspnea, pleuritic chest pain, and hemoptysis. Hemoptysis signals pulmonary infarction, a late sign of tissue necrosis.

In a postoperative total hip replacement patient, this triad indicates a likely massive, central embolus causing right ventricular strain. This is a medical emergency requiring immediate action, not just monitoring.

CautionDo not confuse this with common postoperative findings like mild hypoxia, tachycardia, or anxiety. The sudden onset and combination of all three symptoms (dyspnea, pleuritic pain, hemoptysis) is the key differentiator from a smaller PE or atelectasis. Activate the rapid response team immediately.

## 핵심 개념

- **Pulmonary Embolism (PE)** — A blockage in one of the pulmonary arteries in the lungs, most often caused by blood clots that travel from the legs or other parts of the body (deep vein thrombosis).
- **Pleuritic Chest Pain** — Sharp, stabbing chest pain that worsens with breathing or coughing, caused by inflammation of the pleura, often seen with pulmonary infarction from PE.
- **Hemoptysis** — The coughing up of blood or blood-stained sputum from the bronchi, larynx, trachea, or lungs, indicating pulmonary infarction and alveolar hemorrhage in the context of PE.
- **Venous Thromboembolism (VTE)** — A condition that includes both deep vein thrombosis (DVT) and pulmonary embolism (PE), a significant risk after major orthopedic surgery like total hip replacement.
- **Pulmonary Infarction** — Death of lung tissue due to a lack of blood supply, a severe complication of PE where the blockage is distal and persistent, leading to tissue necrosis and often hemoptysis.

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