Wound, Ostomy and Continence Nurses Society (WOCN) Practice Exam

What describes an alternating pressure mattress?

1. A mattress that remains static

2. A support surface that is always firm

3. A surface with air chambers that alternately inflate and deflate

4. A mattress that does not provide pressure relief

The correct answer is: A surface with air chambers that alternately inflate and deflate

An alternating pressure mattress is designed to provide pressure relief for individuals at risk of pressure ulcers or those who have already developed them. The unique feature of this type of mattress is its air chambers, which alternately inflate and deflate. This cyclical change in pressure helps to redistribute weight and reduce constant pressure on specific body parts, promoting better blood flow and reducing the risk of skin breakdown. This mechanism is particularly beneficial for patients who are immobile or have limited mobility, as it helps to create a dynamic support surface. By preventing prolonged pressure on any single point of the body, the alternating pressure mattress facilitates healing and comfort. In contrast, a mattress that remains static or one that is always firm would not provide the necessary pressure relief and could actually contribute to the risk of developing pressure ulcers. Similarly, a mattress that does not provide pressure relief lacks the essential function that is critical in caring for high-risk patients.