TY - CHAP M1 - Book, Section TI - Pressure Ulcers A1 - Thomas, David R. A2 - Williams, Brie A. A2 - Chang, Anna A2 - Ahalt, Cyrus A2 - Chen, Helen A2 - Conant, Rebecca A2 - Landefeld, C. Seth A2 - Ritchie, Christine A2 - Yukawa, Michi PY - 2014 T2 - Current Diagnosis & Treatment: Geriatrics, 2e AB - Pressure ulcers are caused by pressure applied to susceptible tissues. Tissue susceptibility may be increased in the presence of maceration and by friction and shear forces.Comorbid conditions, especially immobility and decreased tissue perfusion, increase the risk of pressure ulcers.Most pressure ulcers develop over bony prominences, most commonly the sacrum, heels, and trochanteric areas.Most pressure ulcers develop in acute hospitals; the risk is greatest in orthopedic and intensive care unit patients.Pressure ulcers can be stage I (blanchable hyperemia), stage II (extension of the ulcer through the epidermis), stage III (full-thickness skin loss with damage or necrosis of subcutaneous tissue), or stage IV (full-thickness wounds with extensive destruction, tissue necrosis, or damage to muscle, bone, or supporting structures).Pressure ulcers do not necessarily progress from stage I through stage IV. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/18 UR - accessmedicine.mhmedical.com/content.aspx?aid=1100068772 ER -