What is the primary indication for using a bronchodilator?

The primary indication for using a bronchodilator is to relieve bronchospasm. Bronchodilators work by relaxing the muscles of the airways, thereby widening them and making it easier to breathe. This is particularly important in conditions such as asthma and chronic obstructive pulmonary disease (COPD), where bronchospasm—constriction of the smooth muscles around the airways—can lead to difficulty in breathing.

By expanding the air passages, bronchodilators allow for improved airflow and oxygen delivery to the lungs, which is essential for providing relief from symptoms like wheezing, shortness of breath, and chest tightness.

In contrast, the other options do not relate directly to the primary function of bronchodilators. Controlling blood pressure pertains to cardiovascular medications, enhancing resistance to lung infections is more aligned with immunological support or antibiotics, and reducing inflammation typically involves corticosteroids rather than bronchodilators.