What is a key benefit of an alternating pressure cushion?

• A. It increases circumference.
• B. It electrically heats the patient.
• C. It redistributes pressure and reduces shear by alternately inflating and deflating cells.
• D. It fixes pressure points.

Answer: (C)

Alternating pressure cushions unload tissue that is at risk for breakdown by changing the pressure environment under the body. They use air cells that inflate and deflate in cycles, so as some cells lift, pressure is redistributed away from vulnerable bony areas, and the shifting cycles also reduce shear forces from sliding against the surface. This dynamic pressure relief helps maintain tissue perfusion and lowers the risk of pressure injuries. They don’t heat the body, don’t aim to increase body circumference, and don’t permanently “fix” pressure points, but continually adjust pressure to minimize sustained loading and friction.