RESPIRATORY
CHRONIC OBSTRUCTIVE PULMONARY DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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FEV1/FVC < 0, 7
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FEV1 increase > 12% and > 200 ml after bronchodilator test
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FEV1/FVC <0.8 after bronchodilator test
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Gaensler index < 0.7 after bronchodilator test
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Detailed explanation-1: -The spirometric criterion required for a diagnosis of COPD is an FEV1/FVC ratio below 0.7 after bronchodilator.
Detailed explanation-2: -Ratio of FEV1/Slow Vital Capacity of < 0.7 Is Associated With Clinical, Functional, and Radiologic Features of Obstructive Lung Disease in Smokers With Preserved Lung Function-PMC.
Detailed explanation-3: -Average normal values in healthy males aged 20-60 range from 5.5 to 4.75 liters, and average normal values for females aged 20-60 range from 3.75 to 3.25 liters.
Detailed explanation-4: -Other criteria to consider the bronchodilator response as positive are a post-bronchodilator FEV1 percentage increase greater than 15% of baseline, an increase in post-bronchodilator FEV1 greater than 10% of the predicted value (10) or an absolute 400 ml increase in FEV1 (6).