Full-body interface pressure testing as a method for performance evaluation of clinical support surfaces

Area of Science:

• Biomedical Engineering
• Materials Science
• Clinical Research

Background:

• Pressure ulcers are a significant clinical problem, necessitating improved evaluation methods for support surfaces.
• Current methods for assessing clinical support surfaces lack a comprehensive approach to pressure distribution analysis.
• Designers require reliable tools to develop surfaces that effectively mitigate pressure ulcer incidence.

Purpose of the Study:

• To introduce and validate a novel Pressure Index (P(index)) for evaluating clinical support surface performance.
• To integrate user representation and clinical simulation parameters into a single-value mean pressure index.
• To assess the accuracy and repeatability of the developed mean pressure index in predicting surface efficacy.

Main Methods:

• Defined a Pressure Index (P(index)) based on analytical equations evaluating average, peak, and magnitude of interface pressures.
• Incorporated subject representation and head-of-bed elevation parameters into the P(index) to create a mean pressure index.
• Tested and compared three distinct support surfaces (innerspring, foam, low-airloss) using the developed evaluation method.

Main Results:

• The mean pressure index demonstrated accuracy and reproducibility in evaluating the tested surfaces.
• Low-airloss surfaces exhibited superior performance in pressure reduction compared to foam and innerspring mattresses.
• Standard hospital innerspring mattresses showed the poorest performance in pressure reduction (p < 0.0001).

Conclusions:

• The developed mean pressure index is a valid and reproducible method for assessing clinical support surface performance.
• This index provides a valuable tool for designers aiming to reduce pressure ulcer incidence.
• The findings highlight significant performance differences among common clinical support surfaces, guiding material selection and design improvements.