(Top) A urine sodium concentration (UNa) of approximately 30 mEq/L is observed frequently in patients with hyponatremia secondary to syndrome of inappropriate.

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Presentation transcript:

(Top) A urine sodium concentration (UNa) of approximately 30 mEq/L is observed frequently in patients with hyponatremia secondary to syndrome of inappropriate secretion of antidiuretic hormone (SIADH; •) or to salt depletion (SD; ○). (Top) A urine sodium concentration (UNa) of approximately 30 mEq/L is observed frequently in patients with hyponatremia secondary to syndrome of inappropriate secretion of antidiuretic hormone (SIADH; •) or to salt depletion (SD; ○). (B) All of the patients with SD presented a fractional excretion of Na (FENa) <0.5%, but low values are also observed in SIADH when the urinary flow is low (urinary/plasma creatinine ratio [U/P creat] >140). Data from reference (33), with permission from S. Karger AG. Guy Decaux, and Wim Musch CJASN 2008;3:1175-1184 ©2008 by American Society of Nephrology