Inclusion Criteria:Patients aged 18-99, admitted to the General Intensive Care Unit from January 2011 to June 2021 (inclusive), due to a medical condition that may expose them to significant pain during hospitalization: chest, abdominal, pelvic or lower extremity surgery, pancreatitis, multiple rib fractures, trauma including chest, abdominal, pelvic, or lower limb trauma, and treated with epidural or systemic anesthesia during their stay in the unit.  -  Exclusion Criteria:Patients not admitted for the above reasons. -