Which of the following best describes how chest physiotherapy aids mucus clearance?

• A. Postural drainage, chest percussion, and vibration to facilitate mucus clearance
• B. Nebulized antibiotics
• C. Incentive spirometry
• D. Oxygen humidification

Answer: (A)

The main idea is how physical techniques directly mobilize and move mucus out of the airways. Chest physiotherapy combines gravity-based drainage, percussion, and vibration to loosen and shift thick secretions toward larger airways so they can be coughed up or swallowed. Postural drainage uses specific body positions to let gravity help drain mucus from different lung segments. Chest percussion delivers rhythmic taps to the chest wall to break up thick mucus, while vibration during exhalation helps loosen and move secretions without harming the airways. Together, these actions improve mucus clearance, reduce airway obstruction, and help prevent atelectasis in patients with heavy secretions. In contrast, nebulized antibiotics target infection, incentive spirometry focuses on expanding the lungs to prevent collapse rather than clearing mucus, and oxygen humidification mainly preserves moisture in inspired air rather than actively aiding mucus removal.