Abstract
Potassium bicarbonate (KBC) potently reduces urine calcium excretion in adult humans, including patients with hypertension or calcium urolithiasis, and postmenopausal women. In the latter, who have substantial risk of calcium deficiency, it remains unknown whether the observed short-term urine calcium-lowering effect of KBC persists over years. We studied 170 postmenopausal women randomized to KBC 30, 60, or 90 mmol/d (KBC treatment), or placebo, for up to 36 months. Each received a multivitamin with 400 IU vitamin D, and calcium carbonate as needed to produce a total dietary calcium intake of at least 30 mmol daily. Daily urine calcium excretion (UCaV) did not differ among groups at baseline (all-groups mean ± sd, 155 ± 83 mg/d). From 1–36 months of KBC treatment, adjusting UCaV for creatinine (Cr) excretion, each dose of KBC reduced UCaV (P < 0.01) with a dose-dependent trend (P = 0.05). The reduced UCaV/Cr persisted throughout the KBC treatment period (up to 36 months) in all KBC, and the greatest redu...
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