[Electrolyte and collagen content of rat heart in chronic Mg-deficiency and stress (author's transl)].

In chronic Mg-deficiency, there is a decrease in the content of Mg and K+ in the heart muscle. The contents of Ca, Na+ and hydroxyproline increase. There is also an increased urinary excretion of adrenaline and especially noradrenaline. With simultaneous noise stress, these changes are even greater. The magnitude of the changes increases with the degree of Mg-deficiency. The changes in the contents of Na+, K+, Ca, Mg and hydroxyproline correlate with the excretion of noradrenaline. The increase in the collagen content can be verified by electron microscopy, and it is due to a stimulation of the fibrocytes.