Certified Wound Care Nurse (CWCN) Practice Exam

Which type of compression wrap is Unna's boot classified as?

1. Elastic compression

2. Inelastic compression

3. Dynamic compression

4. Intermittent compression

The correct answer is: Inelastic compression

Unna's boot is classified as inelastic compression. It is a type of compression dressing made of a zinc oxide paste bandage that hardens upon application. The primary purpose of Unna's boot is to provide consistent pressure to the lower extremities, often for the treatment of venous leg ulcers or chronic venous insufficiency. This form of compression is beneficial because it maintains a constant pressure without losing its effectiveness during movement or over time. Unlike elastic compression, which can stretch and lose its compression efficacy as the limb varies in size, inelastic compression provides a rigid support that holds the dressings in place and prevents edema (swelling). Due to its inelastic characteristics, Unna's boot is particularly useful in managing conditions where constant compression is required to promote healing and reduce swelling, making it an effective choice in specific wound care scenarios.