A 40-year-old woman with inflammatory bowel disease has been receiving TPN for over 3 weeks. Workup reveals pelvic abscess. She undergoes exploratory laparotomy, resection of small bowel with anastomosis, and drainage of pelvic abscess. During surgery, TPN is maintained at the original rate of 125 mL/h. In the recovery room, the patient is found to have a urine output of 200 mL/h. CVP is 1, and laboratory results are Na,149;K,3.5;Cl,110;HCO3,18; BUN, 40; and creatinine, 1 mg/dL. Which of the following statements is true regarding this condition?