A 45-year-old man with fibrostenotic Crohn’s disease and a 30-lb (13.6-kg) weight loss is admitted with a diagnosis of severe malnutrition. He is taken to the operating room for an ileocectomy and end ileostomy. After resumption of a regular diet, the patient experiences confusion, diplopia, and respiratory depression requiring intubation. The expected electrolyte abnormality is:

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