lized damage to the skin and/or underlying soft tissue usually over a bony prominence or related to a medical or other device. The injury can present as intact skin or an open ulcer and may be painful. The injury occurs as a result of intense and/or prolonged pressure or pressure bination with shear. The tolerance of soft tissue for pressure and shear may also be affected by microclimate, nutrition, perfusion, co-morbidities and condition of the soft tissue. 压力引起压疮的机制正常的毛细血管内压力为12~30mmHg 当局部压力>16mmHg ,即可阻断毛细血管对组织的灌流。当局部压力>30~35mmHg , 持续 2~4h, 即可引起压疮压疮的好发部位骶尾部( 23% ) 压疮发生部位坐骨( 24% ) 足跟(11% ) 外踝(7%)髂前上棘(4%)压疮的三力作用损伤深层的组织垂直压力剪切力摩擦力损伤皮肤表皮造成皮肤缺血性损害 NPUAP 2007 压疮分期深部组织损伤 Deep Tissue Pressure Injury Ⅰ期( Stage Ⅰ) Ⅱ期( Stage Ⅱ) Ⅲ期( Stage Ⅲ) Ⅳ期( Stage Ⅳ) 不明确分期 Unstageable Pressure Injury 1234
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