Na+ retention as a cause for transduate?

[MudPhud20XX]

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So FA lists causes for transduate as

1. Increased hydrostatic pressure (HF)
2. Decreased oncotic pressure (eg., cirrhosis, nephrotic syndrome)
3. Na+ retention

I don't get the Na+ retention. If you retain Na+, won't that increase the oncotic pressure? Can anyone explain this?

 

[tasar1898]

My friend , I think that you are lacking basic concepts.. Is your test close??

Now as far as your question is concerned , Na always drags water with it , which will increase the endovascular volume --> Increase Pc in the vessels---> Transudation

Na + retention can actually also decrease the oncotic pressure , since you are diluting the protein content of the endovascular volume

 

[worldbeater]

Yep, and if they happen to ask the ratio, it's 3 molecules of water that gets pulled in for every 1 molecule of sodium.