Questions: Which of the following is an example of an obstructive lung disease that would have a normal TLC but a reduced FEV1/FVC ratio? Pulmonary fibrosis Pneumonia Asthma Tuberculosis

Which of the following is an example of an obstructive lung disease that would have a normal TLC but a reduced FEV1/FVC ratio? Pulmonary fibrosis Pneumonia Asthma Tuberculosis
Transcript text: Which of the following is an example of an obstructive lung disease that would have a normal TLC but a reduced FEV1/FVC ratio? Pulmonary fibrosis Pneumonia Asthma Tuberculosis
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Solution

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The answer is the third one (C): Asthma.

Explanation for each option:

  1. Pulmonary fibrosis: This is an example of a restrictive lung disease, not an obstructive one. In restrictive lung diseases, the total lung capacity (TLC) is usually reduced, and the FEV1/FVC ratio is typically normal or increased.

  2. Pneumonia: This is an infection of the lungs that can cause inflammation and fluid accumulation. It is not classified as an obstructive lung disease. Pneumonia can affect lung function, but it does not typically present with a reduced FEV1/FVC ratio characteristic of obstructive lung diseases.

  3. Asthma: This is a classic example of an obstructive lung disease. In asthma, the airways become inflamed and narrowed, leading to difficulty in exhaling air. This results in a reduced FEV1/FVC ratio. However, the total lung capacity (TLC) can remain normal or even be increased due to air trapping.

  4. Tuberculosis: This is an infectious disease caused by Mycobacterium tuberculosis. It primarily affects the lungs but can also affect other parts of the body. Tuberculosis can cause a variety of lung function abnormalities, but it is not typically classified as an obstructive lung disease with a characteristic reduced FEV1/FVC ratio.

Summary: Asthma is an example of an obstructive lung disease that would have a normal total lung capacity (TLC) but a reduced FEV1/FVC ratio.

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