What is the mechanism of action of anticholinergic drugs in respiratory therapy?

The mechanism of action of anticholinergic drugs in respiratory therapy primarily involves blocking acetylcholine receptors in the bronchial smooth muscle. By inhibiting the action of acetylcholine, these drugs lead to bronchodilation, which helps to open the airways and improve airflow in conditions such as asthma and chronic obstructive pulmonary disease (COPD).

When acetylcholine binds to its receptors, it typically causes bronchoconstriction, which narrows the airways and can lead to difficulty breathing. Anticholinergics counteract this effect, providing relief from bronchospasm and making breathing easier for patients. This makes them a valuable therapeutic option in managing respiratory conditions that involve airway constriction.

Other options focus on actions that do not align with the established pharmacological role of anticholinergics, such as enhancing mucus production, stimulating cough reflex, or decreasing respiratory rate, which do not directly contribute to the primary purpose of these medications in respiratory therapy.