1. (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:
©2008 by American Society of Nephrology