Correct!
4. 1 and 3

In most patients with pneumonia not clinically improving a thoracic CT scan should be ordered (1). Arterial blood gases should be obtained in most patients with pneumonia requiring supplemental oxygen admitted to the hospital (2). Arterial blood gases allow detection of hypercapnia and any acid-base abnormalities. A repeat bronchoscopy at this time would seem unlikely to add any clinical important data.
A thoracic CT scan was performed (Figure 2).

Figure 2. Representative images from thoracic CT scan in lung windows.

Arterial blood gases (ABGs) were obtained while the patient was receiving oxygen at 2L/min by nasal cannula.

• pH Arterial: 7.419
• pCO2 Arterial: 46.2
• pO2 Arterial: 96.2
• Total Hemoglobin: 10.9

Which of the following are true? (Click on the correct answer to be directed to the third of six pages).

1. The ABGs show a compensated respiratory acidosis
2. The ABGs show an anemia
3. The thoracic CT scan shows consolidation in the left lower lobe with bibasilar mucoid impaction
4. 1 and 3
5. All of the above

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