(one) PU definition PU, full title Pressure Ulcear, namely pressure ulcer, also said that the bedsore or presses the sore. Because PU refers to the local organization the long time bearing to create the blood circulation to bond, the local soft tissue lacks the blood, the oxygen deficit, the fester and necrosis. (two) the PU graduation basis clinical manifestation, presses the sore to be possible to divide into three issues: I red spot time: After bodily local long-term bearing, local blood circulation bad, the bearing spot organization lacks the blood, the oxygen deficit, the arterial bifurcation reactivity expands, causes to assume the hyperemia shape local, local skin performance for red spot as well as mild dropsy. If the bearing situation continues to exist, the skin presents the blue purple. II wheal time: The blood capillary permeability adds, presents the wheal locally which the size varies. Dermis and Subcutaneous tissue also further swelling, the skin blushes, the hyperemia, the organization induration is more obvious. III ulcer time• Shallow ulcer time: Ulcer table is shallow, the depth does not surpass the skin entire level. Clinical manifestation for ulcer boundary ataxia, basis
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