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USMLE Step 2

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A written answer, marked

A question from a USMLE Step 2 mock paper, answered and marked. From How to Prepare for USMLE Step 2 CK: A Practical Guide.

Paper — Acute chest pain and dyspnoea41:36
78%Acute chest pain and dyspnoea — marked18/23 marks · 41:36 taken

A 58-year-old man has sudden pleuritic chest pain and dyspnoea after a long flight. He is alert, blood pressure is 124/76 mmHg, heart rate is 106/min, oxygen saturation is 95% on room air, and examination shows no shock. What is the next best step?

3/4

I would obtain CT pulmonary angiography immediately because pulmonary embolism is the most likely diagnosis.

You recognised pulmonary embolism, but moved directly to imaging without first establishing whether the patient is in a group where D-dimer is useful or whether another finding makes imaging the appropriate first test.

Missed

State the pretest probability before choosing D-dimer or imaging.

Explain why haemodynamic stability matters to the initial pathway.

Model answerRepresent the problem as a stable patient with suspected pulmonary embolism after a provoking risk factor. Assess clinical probability using the history and examination. If the probability is low or intermediate and there is no contraindication, D-dimer can be used to decide whether imaging is needed; higher probability generally proceeds to appropriate imaging. Reassess immediately if instability develops.

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