Chest physical therapy is best defined as:

• A. Ischemia
• B. Chest physical therapy
• C. Necrosis
• D. Reverse T position

Answer: (B)

Chest physical therapy is a collection of techniques designed to clear the airways and improve ventilation by mobilizing and removing secretions. It typically includes chest percussion, vibration, postural drainage, breathing exercises, and effective coughing techniques to help patients with retained mucus, atelectasis, or pneumonia clear their airways and improve gas exchange. The other terms refer to conditions or postures rather than a therapeutic approach—ischemia and necrosis describe tissue injury or death, and a specific position like the reverse T position is a method for drainage in some contexts, not a definition of the therapy itself.