[Superselective parathyroid hormone determination--a reliable diagnosis of the location of endocrinological active parathyroid neoplasms].

The importance of superselective catheterization of the small jugular veins for PTH-radioimmunoassay is shown as an improvement of the preoperative localization technique. Since May 1976 in 20 patients the diagnosis of pHPT could be established. Our own experiences with the method of small vein sampling combined with the radioimmunoassay demonstrate that a reliable localization of overactive parathyroid tumours is possible.

[Preoperative location of parathyroid adenomas using supraselective parathyroid hormone determination in the blood of the cervical veins].

After a short presentation of advances in biochemical and clinical analysis of primary hyperparathyroidism, the importance of superselective catheterization of the small jugular veins for PTH radioimmunoassay is shown as an improvement of the preoperative localization technique. Since May 1976, the diagnosis of pHPT could be established in 20 patients. Our own experiences with the method of small vein sampling combined with the radioimmunoassay demonstrate that a reliable localization of overactive parathyroid tumors is possible.

[Correlations between metabolisms of magnesium, calcium and parathormon (author's transl)].

Serum- or plasma levels of 102 healthy individuals as well as 78 patients with chronic renal insufficiency of various degrees were tested for parathormon (PTH), calcium, magnesium, anorganic phosphate, alkaline phosphatase, kreatinin, total protein as well as magnesium concentrations of the erythrocytes; attempts were made to correlate these parameters with each other. As most important finding in healthy individuals a significant negative correlation could be observed between serum PTH and magnesium of erythrocytes, whereas patients with renal insufficiency had a marked elevation and significant positive correlation between these two parameters. Since all other correlations were not as striking, if compared to these findings, we concluded that a feedback regulation system may exist in the intracellular magnesium concentration and PTH metabolism, so that an increase of the intracellular magnesium stimulates the PTH secretion, whereas elevated PTH activity causes a decrease of the intracellular magnesium together with a depression of the PTH release.