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

What is the minimum depth required for air chambers in alternating pressure surfaces?

1. 5 cm

2. 10 cm

3. 15 cm

4. 20 cm

The correct answer is: 10 cm

The requirement for the minimum depth of air chambers in alternating pressure surfaces is set to ensure adequate functioning and effective pressure relief for patients at risk of pressure ulcers. A depth of 10 cm is commonly accepted as the standard minimum because this dimension balances the need for sufficient air exchange while providing appropriate support and comfort to the individual. Air chambers that are too shallow may not provide effective pressure reduction, while those that are excessively deep can lead to instability or inadequate responsiveness in the system's pressure modulation. Since alternating pressure surfaces work by varying the air pressure in individual chambers, a depth of 10 cm allows for optimal performance in distributing weight and reducing pressure on vulnerable skin areas. In context, depths below this standard may not allow for the necessary air displacement required to achieve effective pressure relief, making 10 cm the minimum depth to ensure that the device performs its intended purpose safely and efficiently.