What indicates an effective response to bronchodilator therapy?

An improvement in peak flow readings is a key indicator of an effective response to bronchodilator therapy. Peak flow meters measure the maximum speed of expiration and are commonly used to assess lung function in individuals with conditions such as asthma or chronic obstructive pulmonary disease (COPD). When a bronchodilator is effective, it relaxes the airway smooth muscles, leading to reduced airway resistance and improved airflow. This physiological change is reflected by higher peak flow readings, demonstrating that the patient's airflow limitation has been alleviated and that they are experiencing better respiratory function.

While an increase in heart rate, decrease in respiratory rate, and reduction in blood pressure might occur under certain medical conditions or after certain treatments, these measures are not specific indicators of how well bronchodilator therapy is working. In fact, an increase in heart rate could be a side effect of certain bronchodilators, rather than a sign of effective therapy. Hence, peak flow improvements are the most reliable measure for evaluating the effectiveness of bronchodilator treatment.