During postural drainage for a patient with cystic fibrosis, when should vibration be performed?

During postural drainage for a patient with cystic fibrosis, when should vibration be performed?

• A. During the patient's inhalation
• B. After percussion
• C. Before percussion
• D. During the patient's exhalation

Answer: (D)

Vibration is most effective when applied during the expiratory phase because the outward airflow helps carry loosened secretions toward the larger airways. The high‑frequency oscillations from the vibration further loosen mucus stuck to the bronchial walls, making it easier to expectorate with a cough. If vibration were done during inhalation, secretions could be pushed deeper into the lungs, reducing clearance. Synchronizing vibration with exhalation maximizes the movement of mucus toward the mouth for expulsion.

Vibration is most effective when applied during the expiratory phase because the outward airflow helps carry loosened secretions toward the larger airways. The high‑frequency oscillations from the vibration further loosen mucus stuck to the bronchial walls, making it easier to expectorate with a cough. If vibration were done during inhalation, secretions could be pushed deeper into the lungs, reducing clearance. Synchronizing vibration with exhalation maximizes the movement of mucus toward the mouth for expulsion.