In COPD, the FEV1/FVC ratio typically what happens as obstruction worsens?

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Multiple Choice

In COPD, the FEV1/FVC ratio typically what happens as obstruction worsens?

Explanation:
In obstructive lung disease like COPD, the ability to quickly blow out air is reduced. FEV1 measures how much air you can forcefully exhale in the first second, and FVC is the total amount you can exhale. When obstruction worsens, expiratory flow drops more than the total exhaled volume, so FEV1 falls relative to FVC. This makes the FEV1/FVC ratio smaller as the disease becomes more severe. That’s why in COPD the ratio typically decreases with increasing obstruction.

In obstructive lung disease like COPD, the ability to quickly blow out air is reduced. FEV1 measures how much air you can forcefully exhale in the first second, and FVC is the total amount you can exhale. When obstruction worsens, expiratory flow drops more than the total exhaled volume, so FEV1 falls relative to FVC. This makes the FEV1/FVC ratio smaller as the disease becomes more severe. That’s why in COPD the ratio typically decreases with increasing obstruction.

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