A nurse is caring for a child who is to receive percussion, vibration, and postural drainage. Which of the following actions should the nurse take first?

A. Percuss the upper posterior chest: Percussion helps loosen secretions, but it should be done after bronchodilator administration to maximize effectiveness. B. Instruct the client to cough: Coughing is encouraged at the end of the procedure to expectorate loosened mucus. C. Perform vibration while the client exhales slowly through the nose: Vibration is part of the procedure but not the first step. It follows percussion. D. Administer albuterol by nebulizer: Administering a bronchodilator before airway clearance therapy helps open the airways and make mucus clearance more effective.