Pressure-Related Intact Discolored Areas of Skin (PRIDAS) refers to a type of pressure-induced deep tissue injury with overlying skin rather than ulceration.

Features of PRIDAS:

(1) The patient is at risk for pressure ulceration.

(2) The patient develops an area of discolored but intact skin in an area subject to pressure. The skin usually shows nonblanching erythema.

(3) Beneath the skin there is degeneration of subcutaneous fat.

(4) Exclusion of other causes of soft tissue injury: cold, blast injury, injection site trauma, abscess, etc


Farid et al that the skin temperature at the site of PRIDAS was predictive of subsequent course. An area that was cooler by > 1°C was likely to undergo necrosis while an area that was warmer did not.

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