Final answer:
A bronchodilator may be provided to a client with asthma prior to conducting postural drainage to optimize airflow and improve the effectiveness of the drainage technique.
Step-by-step explanation:
Before conducting postural drainage, a PN (Prescribing Nurse) may provide a bronchodilator to a client with asthma. This is because asthma is characterized by airway constriction and bronchospasm, which can make it difficult to clear mucus from the airways. Bronchodilators work by relaxing the smooth muscles around the airways, opening them up and allowing for easier breathing. By administering a bronchodilator prior to postural drainage, the PN helps to optimize airflow and improve the effectiveness of the drainage technique.