|Asthma is a chronic inflammatory disease of the bronchial tubes in which the bronchi narrow excessively and generally reversibly in response to a variety of stimuli. It occurs in 3% - 5% of all people at sometimes in their lives. In many respiratory diseases, particularly in asthma, the resistance to airflow becomes great during expiration, causing tremendous difficulty in breathing. It has led to the concept called maximum expiratory flow, which can be defined as follows: when a person expires with great force, the expiratory airflow reaches a maximum flow beyond which the flow cannot be increased any more even with greatly increased additional force, and this characteristic of asthma is the principle of its diagnosis.
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