Pneumologia SBPT Practice Questions - Título De Especialista Em Pneumologia E Tisiologia (Sociedade Brasileira De Pneumologia E Tisiologia AMB) Exam

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A 74-year-old asymptomatic non-smoker undergoes spirometry before elective surgery. The pre-bronchodilator FEV1/FVC ratio is 0.68, and the post-bronchodilator FEV1/FVC ratio is 0.68. The Lower Limit of Normal (LLN, 5th percentile) for the FEV1/FVC ratio calculated for his age, sex, and height is 0.65. How should this spirometry result be interpreted regarding the presence of obstructive ventilatory defect?

Normal ventilatory pattern without obstruction, because the post-bronchodilator FEV1/FVC ratio is above the Lower Limit of Normal (LLN). Definite obstructive ventilatory defect, because the post-bronchodilator FEV1/FVC ratio is below the fixed cutoff of 0.70. Mixed restrictive and obstructive defect, necessitating immediate whole-body plethysmography. Isolated small airway disease, because fixed cutoffs supersede lower limit of normal calculations in geriatric populations.

Correct Answer:

Normal ventilatory pattern without obstruction, because the post-bronchodilator FEV1/FVC ratio is above the Lower Limit of Normal (LLN).

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