Patients who have aspiration pneumonia present with right lower lobe involvement more often than with involvement of the left lower lobe. You know this is because
a. the left mainstem bronchus angles down more than the right.
b. more people are right-side dominant.
c. the right mainstem bronchus angles down more than the left.
d. the right mainstem bronchus is narrower than the left.
C
The right bronchus is wider than the left and angles at 20 to 30 degrees from the midline. Because of this angulation and the forces of gravity, the most common site of aspiration of foreign objects is through the right mainstem bronchus into the lower lobe of the right lung.
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