Answer:
by hyperinflation of lungs
Step-by-step explanation:
Asthma is a disease of the lungs caused by inflammation and narrowing of the airways, thereby difficulting breath. Severe asthma disorders are associated with a significant decrease in the rate of maximal expiratory airflow and the reduction in the total volume expired, which is a value known as Forced Vital Capacity (FVC). In consequence, severe asthma events are correlated with the hyperinflation of the lungs and thus be a possible cause for the observed reduction in the FVC.