[Sodium, potassium and magnesium in plasma and erythrocytes during haemodialysis of children (author's transl)].

In 19 children with chronic renal insufficiency sodium, potassium and magnesium in plasma and erythrocytes were measured before and after haemodialysis. Creatinine and the acid-base status were also determined. The mean predialysis values of sodium in plasma were within normal limits, in erythrocytes in the lower normal range.

[Magnesium concentration in erythrocytes and plasma in childhood (author's transl)].

In 243 children of various ages the magnesium concentration was determined simultaneously in erythrocytes and plasma. The analysis began in the mother immediately after delivery, in the umbilical vein and in the newborn infant, and ended at school age (6-14 years). The magnesium concentration in plasma as well as in the erythrocytes showed a constant tendency to increase.

[The clinical importance of magnesium during neonatal life (author's transl)].

By atomic absorption spectrophotometry (ASS) the magnesium levels in the serum of 50 mothers, their mature healthy infants and the umbilical vein and the umbilical artery were determined. The differences between maternal and neonatal levels and between umbilical vein and umbilical arteries are statistically significant. The results were as follows: Antecubital venous blood of the mother 1.