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Why Increased Sodium Excretion in SIADH

I just want to explain the reason why there's natriuresis in SIADH as this often is confusing and counter-intuitive

In SIADH, there's ECF volume expansion this result in
1- Decreased Aldosterone secretion thereby more Sodium is lost in urine.
2- Increased Atrial Natriureteric Peptide (ANP) again leading to increased Sodium excretion.
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