What is the primary function of beta-agonists in respiratory therapy?

Beta-agonists are primarily used in respiratory therapy for their ability to relax bronchial smooth muscle. This relaxation leads to bronchodilation, which is essential for easing breathing in conditions like asthma and chronic obstructive pulmonary disease (COPD). By acting on beta-adrenergic receptors in the lungs, these medications promote airway widening, thereby improving airflow and alleviating respiratory distress.

Reducing mucus production, inhibiting histamine release, or increasing lung perfusion are not the primary actions of beta-agonists. While some beta-agonists may have secondary effects on mucus clearance due to improved airflow, their main therapeutic purpose centers on enhancing airway patency through smooth muscle relaxation.