<qa>  How many critically ill burn patients will be enrolled in the hydro procedure room?The study methodology will follow the CONSORT guidelines. A total of 30 critically ill burn patients with a total body surface area TBSA 5 requiring dressing changes that will be performed in the hydro procedure room will be enrolled over 18-24 months from the 9-bed burn-trauma ICU B-TICU at the UCH. Patients will only be enrolled if they can receive dressing changes in the burn treatment room because these patients are alert and oriented, not sedated, and are able to communicate with health care providers and respond to questions regarding their perceptions of pain and anxiety. Subjects will be randomized in a double-blind manner to receive placebo n15 or ketamine n15 in addition to usual care used before, during, and after dressing changes. 