Final answer:
C. assess the patient for excess secretions. The therapist should assess the patient for excess secretions.
Step-by-step explanation:
The therapist should assess the patient for excess secretions. Negative pressure during inspiration on the CPAP pressure manometer suggests that there may be an obstruction in the airway, such as excess secretions, that is preventing proper airflow. By assessing the patient for excess secretions, the therapist can determine if this is the cause of the respiratory distress. If excess secretions are identified, appropriate interventions can be taken, such as suctioning or bronchodilator administration, to help clear the airway and improve ventilation.