A Patient with history of shoness of breath has, Decreased FEVI/FVC Ratio, Normal DECO. A 200 ml increase in baseline FEV1 is observed 15 minutes after administration of bronchodilators. The likely diagnosis is:
**Core Concept**
The underlying principle in this question is the diagnosis of obstructive versus restrictive lung disease, based on spirometric parameters such as FEV1 (Forced Expiratory Volume in 1 second) and FVC (Forced Vital Capacity). A decreased FEV1/FVC ratio is typically seen in obstructive lung diseases, whereas a normal or increased ratio is seen in restrictive lung diseases.
**Why the Correct Answer is Right**
The patient's decreased FEV1/FVC ratio suggests an obstructive process. The administration of bronchodilators leads to a significant increase in FEV1 (200 ml), indicating reversible airway obstruction. This is a hallmark of asthma or chronic obstructive pulmonary disease (COPD), which are both obstructive lung diseases. The normal Diffusing Capacity for Carbon Monoxide (DLCO) suggests that the lung parenchyma is intact, and there is no significant restrictive component.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided.
* **Option B:** This option is not provided.
* **Option C:** This option is not provided.
* **Option D:** This option is not provided.
**Clinical Pearl / High-Yield Fact**
A significant increase in FEV1 (> 200 ml) after bronchodilator administration is a key diagnostic criterion for asthma. It indicates reversible airway obstruction, which is a hallmark of this condition.
**Correct Answer:** B. Asthma (assuming the missing options are B. Asthma, C. COPD, and D. Other obstructive lung disease).