A 40-year-old man with peptic ulcer disease reports vomiting, nausea, dry mucous membranes, and abdominal pain for the last 2 days. His BP is 92/64 and pulse is 120. His laboratory results show a serum sodium level of 125 mEq/L, urine sodium level of 5 mEq/L, and measured serum osmolality of 270 mOsm/L.
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