What is the typical role of beta-agonists in respiratory therapy?

Beta-agonists are primarily used in respiratory therapy to open the airways, which enhances airflow in patients experiencing conditions like asthma or chronic obstructive pulmonary disease (COPD). These medications work by stimulating beta-adrenergic receptors in the bronchial smooth muscle, leading to relaxation and dilation of the bronchial passages. This bronchodilation effect helps alleviate symptoms such as wheezing, shortness of breath, and chest tightness.

The other options do not accurately reflect the primary function of beta-agonists. Decreasing the respiratory rate is typically managed with different classes of medications or interventions, as beta-agonists do not have a direct effect on the respiratory rate itself. Infusing antibiotics and sterilizing the lungs address infectious processes and other issues, which are outside the scope of beta-agonist therapy. Thus, the role of beta-agonists is specifically linked to their ability to improve airway patency and facilitate better ventilation.