A post-craniotomy patient develops large volumes of dilute urine exceeding 300 mL/h, high serum sodium, and low urine specific gravity. What is the expected diagnosis?
Answer and explanation
Correct answer: C. Central diabetes insipidus
Answer: Central diabetes insipidus.
Why not the others: SIADH presents with oliguria, concentrated urine, and dilutional hyponatremia; Cerebral salt wasting produces hyponatremia with severe natriuresis and hypovolemia; Acute tubular necrosis causes oliguria or non-oliguric renal failure with isosthenuria.
Why not the others: SIADH presents with oliguria, concentrated urine, and dilutional hyponatremia; Cerebral salt wasting produces hyponatremia with severe natriuresis and hypovolemia; Acute tubular necrosis causes oliguria or non-oliguric renal failure with isosthenuria.
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