In experimental SIADH induce in man [1] or animal [2–4] it is well know that not only sodium excretion increase during a few days (particularly if it is acute), the same as been reported for potassium excretion although to a lesser extent. This high potassium excretion is considered to reflect cell adaptation to hypotonicity, it is usually transient (a few days) and depends on the speed by which SNa is decreasing [2–4].
