A 55-Year-Old Man Comes to the Emergency Department Due to Sudden-Onset

A 55-year-old man comes to the emergency department due to sudden-onset dyspnea.  Medical history is significant for hypertension, hyperlipidemia, type 2 diabetes mellitus, and chronic kidney disease.  The patient takes multiple medications and has no drug allergies.  He works for an international bank and returned from a business trip in Australia a day ago.  Blood pressure is 110/70 mm Hg and pulse is 110/min.  Physical examination shows a moderately overweight man with tachypnea.  The lungs are clear on auscultation.  ECG shows sinus tachycardia.  Ventilation/perfusion scanning is ordered.  Which of the following findings would help confirm the suspected diagnosis in this patient?

A) Absence of ventilation and perfusion abnormalities
B) An area showing both ventilation and perfusion defects
C) A perfusion defect without an associated ventilation defect
D) A ventilation defect without an associated perfusion defect
E) Several small areas of matched perfusion and ventilation defects

Correct Answer:

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