Final answer:
The rationale for repositioning an unconscious patient every 2 hours and ensuring that all bony prominences are padded is to prevent the development of pressure ulcers (bedsores) and maintain proper blood flow to the body's tissues.
Step-by-step explanation:
The rationale for repositioning an unconscious patient every 2 hours and ensuring that all bony prominences are padded is to prevent the development of pressure ulcers (bedsores) and maintain proper blood flow to the body's tissues. When a patient remains in one position for an extended period of time, the continuous pressure on bony areas can lead to tissue damage and necrosis. By regularly repositioning the patient and providing padding, the nurse helps to relieve pressure, increase circulation, and reduce the risk of developing bedsores.