Question

question 22
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in addition to fev1/fvc ratio, which of the following is used to evaluate lung diseases?
tidal volume (tv)
inspiratory reserve volume (irv)
expiratory reserve volume (erv)
total lung capacity (tlc)

Explanation:

Total lung capacity (TLC) is a key measure in evaluating lung diseases. It provides information about the overall volume of air the lungs can hold. While tidal volume (TV), inspiratory reserve volume (IRV), and expiratory reserve volume (ERV) are components of lung volumes, TLC gives a comprehensive picture. In lung diseases like emphysema (a type of obstructive lung disease), TLC can be increased due to hyperinflation of the lungs. In restrictive lung diseases (e.g., pulmonary fibrosis), TLC may be decreased as the lungs have reduced expandability. The FEV1/FVC ratio is mainly used to distinguish between obstructive and restrictive patterns (low in obstructive, normal or high in restrictive when corrected for TLC changes), and TLC helps in further characterizing the nature and severity of the lung disease.

Answer:

Total lung capacity (TLC)