Using pressure measurements to evaluate different technologies.

Despite ongoing efforts to improve the prediction, prevention, and treatment of pressure ulcers, clinicians continue to face an overwhelming array of confusing, and sometimes conflicting, information about the technologies used to lower pressure. The purpose of this article is to explain the fundamental differences among units of pressure measurement and those pressures (capillary closing, tissue interface, internal cushion, and hydrostatic) that are commonly described in research as well as sales literature. A clearer understanding of these parameters will help clinicians make informed evaluations of distinct technologies, set realistic expectations for different products, and achieve desired outcomes cost-effectively.