Fasting gastrinemia and elevated supersaturation with hydroxyapatite of fasting urine ? Observations in renal calcium stone patients and controls

✍ Scribed by Schwille, P.O. ;R�menapf, G. ;K�hler, R. ;Weippert, J.H.

• Publisher: Springer
• Year: 1987
• Tongue: English
• Weight: 570 KB
• Volume: 15
• Category: Article
• ISSN: 0300-5623
• DOI: 10.1007/bf00260941

✦ Synopsis

We evaluated serum gastrin, acid-base status, variables of mineral metabolism in fasting blood, as well as pH, relative supersaturation of stone forming constituents, and crystalluria in the associated fasting urine, of control subjects (n = 12), and in age- and weight-matched male normocalciuric (n = 12) and hypercalciuric (n = 12) patients with idiopathic recurrent calcium urolithiasis (RCU). In RCU, mineral metabolism and acid-base data are unchanged, whereas mean serum gastrin is only insignificantly higher as compared to controls. Subclassification of all participants into categories with either high-normal or low-normal gastrin reveals that in RCU with low-normal gastrin there is a higher-than-normal urinary pH and significantly elevated supersaturation of urine with hydroxyapatite. Crystalluria and stone analysis support the assumption that the physico-chemical environment accompanied by low gastrin levels predisposes to urinary precipitation of calcium phosphate with subsequent formation of a stone nidus. pH in fasting urine and integrated fasting serum gastrin correlate significantly, suggesting that low fasting serum gastrin in RCU patients may be considered a risk factor for calcium phosphate stone formation.