Which pulmonary function test pattern is MOST consistent with restrictive lung disease?

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Multiple Choice

Which pulmonary function test pattern is MOST consistent with restrictive lung disease?

Explanation:
In restrictive lung disease, the lungs or chest wall cannot expand fully, so overall lung volumes are reduced. The most characteristic finding on pulmonary function tests is a lower total lung capacity, reflecting the limited expansion. Residual volume tends to be reduced as well because the entire set of lung volumes is diminished. So a pattern showing both a decreased residual volume and a decreased total lung capacity fits the restrictive process best. In contrast, patterns with increased residual volume or increased total lung capacity point toward obstructive processes with air trapping or hyperinflation, which is not typical of restriction.

In restrictive lung disease, the lungs or chest wall cannot expand fully, so overall lung volumes are reduced. The most characteristic finding on pulmonary function tests is a lower total lung capacity, reflecting the limited expansion. Residual volume tends to be reduced as well because the entire set of lung volumes is diminished. So a pattern showing both a decreased residual volume and a decreased total lung capacity fits the restrictive process best.

In contrast, patterns with increased residual volume or increased total lung capacity point toward obstructive processes with air trapping or hyperinflation, which is not typical of restriction.

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