INTESTINAL-ABSORPTION OF CALCIUM AND CALCIUM-METABOLISM IN PATIENTS WITH ESSENTIAL-HYPERTENSION AND NORMAL RENAL-FUNCTION

被引：33

作者：

GADALLAH, M ^{[1
]}

MASSRY, SG ^{[1
]}

BIGAZZI, R ^{[1
]}

HORST, RL ^{[1
]}

EGGENA, P ^{[1
]}

CAMPESE, VM ^{[1
]}

机构：

[1] UNIV SO CALIF,SCH MED,DIV NEPHROL,2025 ZONAL AVE,GNH 4250,LOS ANGELES,CA 90033

来源：

AMERICAN JOURNAL OF HYPERTENSION | 1991年 / 4卷 / 05期

关键词：

CALCIUM; HYPERTENSION; HYPERCALCIURIA; VITAMIN-D;

D O I：

10.1093/ajh/4.5.404

中图分类号：

R6 [外科学];

学科分类号：

1002 ; 100210 ;

摘要：

Several abnormalities of calcium metabolism have been described in patients with essential hypertension, and they have been linked to the pathogenesis of hypertension. Intestinal calcium absorption has been shown to be decreased in rats with spontaneous hypertension, but it has not been studied in patients with essential hypertension. In these studies we have for the first time measured intestinal absorption of calcium (using oral and intravenous administration of Ca47), along with other parameters of calcium metabolism, in 14 patients with essential hypertension and normal renal function and in 16 normal subjects. There was no difference in serum total or ionized calcium, serum phosphorus, parathyroid hormone (PTH), 25-hydroxyvitamin D (25(OH)D), 1,25-dihydroxyvitamin D (1,25(OH)2D), and 24,25-dihydroxyvitamin D(24,25(OH)2D) among hypertensives and normotensives. The urinary excretion of calcium, on the other hand, was greater in hypertensive than in normotensive subjects (195 +/- 33 v 107 +/- 13 mg/24 h, P < .05). There was also no difference in intestinal absorption of calcium after 2 and 24 h among hypertensives and normotensives. When hypertensive patients were stratified according to plasma renin activity (PRA) we found that patients with low PRA had higher intestinal absorption of calcium at 2 h (23 +/- 2.9 v 18 +/- 0.6%, P < .05) but not at 24 h. Serum total and ionozed calcium, PTH, and 1,25(OH)2D were not different between patients with low and those with normal-high PRA. The major derangement of calcium metabolism in patients with essential hypertension is hypercalciuria. This abnormality is more pronounced in patients with low PRA, and it may lead to increased vitamin D-dependent intestinal absorption of calcium.

引用

页码：404 / 409

页数：6

共 35 条

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