A 16-year-old in the pediatric intensive care unit (PICU) is…
A 16-year-old in the pediatric intensive care unit (PICU) is recovering from a severe head injury sustained in a nearly fatal motor vehicle accident (MVA). He is extremely edematous, and his lab values this morning reflect a serum sodium of 119 mEq/L. His urine output is 0.31 mL/kg/hr over the past 18 hours. The nurse understands that based on this information, the most likely diagnosis is: