A 68-year-old man has had 4 days of fever, cough and left-sided pleuritic pain. There is dullness to percussion, bronchial breathing and increased vocal resonance over the lower half of the left chest posteriorly. The right lung field is clear. Sitting upright and breathing room air, his oxygen saturation is 92%. He is alert and says he is most comfortable lying on his left side.
Which one of the following combinations of left lung perfusion and arterial oxygen saturation would you expect once this man lies on his left side?
Keep going — a set of ten like this one, one at a time.
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