问题
单项选择题
A client is at risk for developing a pressure ulcer. The first warning of an impending pressure ulcer is when pressure applied to skin it turns
A. whitish.
B. yellowish.
C. bluish.
D. reddis
答案
参考答案：D
解析：When pressure is applied to the skin, the area first becomes blanched, or whitish. When pressure is relieved, the circulation tends to carry excess blood to the area to make up for the temporary decrease in blood supply. This effect, called reactive hyperemia, causes the skin to redden. Such a reddened area is a precursor of a pressure sore.