Hypervolemic hyponatremia

[yasminaz]

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So, why urine osmolality is high and urine sodium concentration low in for example cirrhosis (or heart insuf etc)? I know that aldosterone -> sodium retention and ADH -> water retention but because there is hyponatremia in plasma, I think that more water than sodium should be reabsorpted and so the urine sodium concentration should be high.. Could someone explain this, please 😀

 

[Transposony]

Aldosterone will reabsorb Na+ and H2O in DCT----> ADH will reabsorb free H2O in CD----> will lead to very concentrated urine mainly due to urea and other solutes.

Explained quite well here.