malinda
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An emphysema patient is breathing quickly and shallowly. A friend tells the patient that he is breathing too fast,
and suggests the patient instead breathe deeply and slowly. The patient complies, then begins to turn blue. What
happened?
A. The decreased compliance of the alveoli collapses them
B. The decreased compliance of the large airways collapses them
C. The increased compliance of the alveoli collapses them
D. The increased compliance of the large airways collapses them
E. Changes in compliance play no role in the observed pathophysiology
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| druas
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I think D?
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| robin082006
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Can you explain? druas, why not C?
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| general malaise
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E?
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| general malaise
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what is the answer malinda?
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| malinda
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The correct answer is D. In emphysema, the compliance of both the lung parenchyma and the weakened
bronchi is markedly increased. This change in compliance can create the paradoxical situation that forced
expiration may compress the larger airways (dynamic compression), trapping air in the alveoli, rather than
allowing air exchange. Thus, the best breathing strategy for these patients is taking short, rapid breaths that do
not cause collapse of airways
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