Certified Wound Ostomy Nurse (CWON) Practice Test

What characterizes an alternating pressure mattress?

1. A mattress that remains firm at all times

2. A mattress with constant inflation

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

4. A mattress without any assistive features

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

An alternating pressure mattress is characterized by its unique design that includes air chambers which alternately inflate and deflate. This mechanism creates shifting pressure across different areas of the body, which helps to reduce the risk of pressure ulcers by promoting circulation and alleviating pressure points. The alternating action encourages blood flow to the skin, thereby offering a more effective support surface for individuals who may be at risk for skin breakdown due to immobility or other factors. In contrast, a mattress that remains firm at all times, one with constant inflation, or a mattress without any assistive features would not provide the dynamic support needed for individuals requiring pressure relief. Static surfaces may not effectively redistribute weight or mitigate the risks associated with prolonged immobility, which is a critical function of an alternating pressure mattress.