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What is the evidence for specific pressure-reducing mattresses?

Pressure-reducing mattresses play an integral role in the prevention of pressure ulcers. Every year an everincreasing variety of equipment is launched on to the market. The efficacy of this equipment is traditionally qualified with case studies but rarely with randomized controlled trials. With the advent of The New NHS: Modern, Dependable (Department of Health, 1997) and the National Institute for Clinical Excellence's (NICE's) pressure ulcer risk assessment and prevention guidance (NICE, 2001), clinical governance systems have started to be put into place and hopefully more evidence will be produced by the manufacturers and the NHS.