In SIADH, which finding is typical?

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Prepare for the Mark Klimek Electrolytes and Endocrine Test. Utilize flashcards, multiple choice questions, and detailed explanations for each query to enhance your understanding. Ace your exam!

Multiple Choice

In SIADH, which finding is typical?

Explanation:
In SIADH the key idea is how excess ADH changes sodium and fluid balance. ADH drives water retention, which dilutes serum sodium and lowers serum osmolality. Yet the body compensates by wasting sodium in the urine, so the effective circulating volume stays near normal. The result is a euvolemic state with hyponatremia and a concentrated urine that is inappropriately rich in water (urine osmolality higher than serum and urine sodium often elevated). Clinically, you don’t expect edema or dehydration—edema isn’t typical of SIADH because the volume status is effectively normal, maintained by natriuresis. Orthostatic hypotension and polyphagia aren’t features here.

In SIADH the key idea is how excess ADH changes sodium and fluid balance. ADH drives water retention, which dilutes serum sodium and lowers serum osmolality. Yet the body compensates by wasting sodium in the urine, so the effective circulating volume stays near normal. The result is a euvolemic state with hyponatremia and a concentrated urine that is inappropriately rich in water (urine osmolality higher than serum and urine sodium often elevated). Clinically, you don’t expect edema or dehydration—edema isn’t typical of SIADH because the volume status is effectively normal, maintained by natriuresis. Orthostatic hypotension and polyphagia aren’t features here.

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