Abstract
Purpose: We tested whether UroPhos section-K, a new slow release neutral form of potassium phosphate (155 mg. phosphate, 8 mEq. potassium per tablet) in a dose of 4 tablets twice daily would produce a sustained hypocalciuric response and maintain bone mass in patients with absorptive hypercalciuria, a major cause of nephrolithiasis characterized by excessive intestinal calcium absorption accompanied in some patients by excessive bone loss. Materials and Methods: A total of 25 patients with absorptive hypercalciuria were studied in a 4-year, prospective, open trial with UroPhos-K at yearly intervals during a 4-day inpatient physiological study with a constant metabolic diet containing 400 mg. calcium, 100 mEq. sodium and 800 mg. phosphate daily. Results: Treatment with UroPhos-K caused a sustained, marked reduction in urinary calcium (264 to 181 mg. daily). Fractional 47calcium absorption decreased modestly (74.0 to 64.6%) commensurate with a reduction in serum 1,25-dihydroxyvitamin D (42 to 34 pg./ml.). Intact parathyroid hormone increased within the normal range (30 to 42 pg./ml.). Bone mineral density was stable at the lumbar spine, femoral neck and distal third of the radius. Conclusions: UroPhos-K may provide a long-term alternative for hypercalciuric patients in whom thiazide therapy fails.
Original language | English (US) |
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Pages (from-to) | 1451-1456 |
Number of pages | 6 |
Journal | Journal of Urology |
Volume | 159 |
Issue number | 5 |
DOIs | |
State | Published - May 1998 |
Keywords
- Bone density
- Calcium
- Delayed-action preparations
- Phosphates
- Urinary calculi
ASJC Scopus subject areas
- Urology