The aim of this retrospective study is to overall evaluate and validate preoperative and intra-operative risk factors for postoperative pressure ulcers in critically ill postoperative patients.

Inclusion Criteria:

• Patients in ICU with a greater than 48 hours
• Underwent a surgical procedures,
• Absence of pressure ulcer present at admission to the ICU and developed a stage II or higher pressure ulcer, deep tissue injury, or unstageable ulcer, as defined by the pressure ulcer staging guidelines of the National Pressure Ulcer Advisory Panel.

Exclusion Criteria:

• Patients will be excluded from the study if they had been diagnosed with pressure ulcer before the surgery
• Pediatric patients

Total about 130 adult surgical patients underwent surgical procedures and admitted in intensive care unit (ICU) using electronic documentation applications from Jan 2012 through Dec 2013.