What is the primary purpose of chest physiotherapy in atelectasis management?

• A. It primarily clears secretions from the airways
• B. It increases oxygen diffusion
• C. It reduces pulmonary edema
• D. It directly reduces fever

Answer: (A)

Chest physiotherapy is used to mobilize and clear secretions from the airways, which helps re-expand collapsed areas of the lung. When mucus plugs block small airways, alveoli collapse and ventilation drops. Techniques like percussion, vibration, and postural drainage loosen secretions and move them toward the larger airways so they can be coughed up. As secretions are cleared and airways reopen, ventilation improves and so can oxygenation. The primary effect is removal of secretions; increasing oxygen diffusion, reducing pulmonary edema, or lowering fever aren’t direct outcomes of chest physiotherapy.