For this study, additional data will be recorded: name, hospital record number, age, height, weight, gender, race, prior medical history, reason for SICU admission, reason for intubation, complications due to mechanical ventilation, days on mechanical ventilation (number of days prior to repositioning procedure and total number of days), length of stay, vital signs pre- and post-repositioning, including oxygen saturation, FiO2, and any peri-procedural vital sign abnormalities.