Chest imaging may be useful in diagnosing asthma in certain situations, including when the patient has a medically important smoking history or occupational chemical exposure, has long standing disease or mat be at risk for chronic obstructive lung disease or lung cancer. (sciencedaily.com)
FEV1 / FVC (a measure of obstructive lung disease) was better by a lesser amount but still statistically significant. (sciencedaily.com)
The result is that the small airways collapse during expiration, leading to an obstructive form of lung disease (airflow is impeded and air is generally «trapped» in the lungs in obstructive lung diseases). (sciencedaily.com)