Question:
A patient presents with dyspnea and tachycardia 7 days after undergoing knee replacement surgery. Which investigation will confirm the diagnosis?
A patient presents with dyspnea and tachycardia 7 days after undergoing knee replacement surgery. Which investigation will confirm the diagnosis?
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Postoperative dyspnea and tachycardia = suspect pulmonary embolism; confirm with CTPA.
Updated On: May 14, 2026
- V/Q ratio
- D-dimer
- Chest X-ray
- CT Pulmonary Angiography (CTPA)
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The Correct Option is D
Solution and Explanation
Concept:
Postoperative dyspnea and tachycardia after knee replacement suggest pulmonary embolism. CT pulmonary angiography is the confirmatory investigation in most clinically suspected cases.
Step 1: Identify risk factor.
Knee replacement surgery increases risk of deep vein thrombosis and pulmonary embolism.
Step 2: Identify symptoms.
Dyspnea and tachycardia after surgery are classic signs of pulmonary embolism.
Step 3: Choose confirmatory test.
The best confirmatory investigation is: \[ \text{CT Pulmonary Angiography} \] Therefore, the correct answer is CT Pulmonary Angiography (CTPA).
Step 1: Identify risk factor.
Knee replacement surgery increases risk of deep vein thrombosis and pulmonary embolism.
Step 2: Identify symptoms.
Dyspnea and tachycardia after surgery are classic signs of pulmonary embolism.
Step 3: Choose confirmatory test.
The best confirmatory investigation is: \[ \text{CT Pulmonary Angiography} \] Therefore, the correct answer is CT Pulmonary Angiography (CTPA).
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