Which pattern is characterized by reductions in both FEV1 and the FEV1/FVC ratio due to airflow limitation?

Which pattern is characterized by reductions in both FEV1 and the FEV1/FVC ratio due to airflow limitation?

• A. Obstructive lung disease pattern
• B. Normal aging changes
• C. Obstructive-restrictive mixed pattern
• D. Restrictive lung disease pattern

Answer: (B)

When FEV1 is reduced alongside a lower FEV1/FVC ratio, it signals airflow limitation typical of an obstructive process. In obstruction, the airways are narrowed or blocked, so expiratory flow diminishes and FEV1 drops more than FVC, pulling the ratio down. Normal aging also lowers FEV1 and FVC, but the FEV1/FVC ratio generally stays near normal because the decline tends to be proportional and not due to irreversible airway narrowing. Restrictive patterns reduce both FEV1 and FVC with a preserved or increased ratio, and mixed patterns show features of both. So the pattern described is best understood as obstructive lung disease.

When FEV1 is reduced alongside a lower FEV1/FVC ratio, it signals airflow limitation typical of an obstructive process. In obstruction, the airways are narrowed or blocked, so expiratory flow diminishes and FEV1 drops more than FVC, pulling the ratio down. Normal aging also lowers FEV1 and FVC, but the FEV1/FVC ratio generally stays near normal because the decline tends to be proportional and not due to irreversible airway narrowing. Restrictive patterns reduce both FEV1 and FVC with a preserved or increased ratio, and mixed patterns show features of both. So the pattern described is best understood as obstructive lung disease.