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Risk factors associated to kidney stones in primary hyperparathyroidism
S Corbetta1, A Baccarelli, A Aroldi
1Institute of Endocrine Sciences, Fondazione Ospedale Maggiore IRCCS, University of Milan, Milan, Italy. sabrina.corbetta@unimi.it
Journal of Endocrinological Investigation
|May 13, 2005
Summary
Primary hyperparathyroidism (PHPT) patients who form kidney stones show higher levels of calcium and oxalate in their urine. These factors, along with severe PHPT, increase the risk of developing nephrolithiasis.
Area of Science:
- Endocrinology
- Nephrology
- Metabolic Bone Disease
Background:
- Nephrolithiasis is a key clinical sign of primary hyperparathyroidism (PHPT).
- Previous studies have not clearly defined clinical or biochemical differences between PHPT patients with and without kidney stones.
Purpose of the Study:
- To investigate clinical and biochemical parameters in PHPT patients who form kidney stones (SF) versus those who do not (NSF).
- To identify potential risk factors for nephrolithiasis in PHPT patients.
Main Methods:
- Collected serum and plasma samples from 55 PHPT patients (43 female, 12 male) after overnight fasting.
- Obtained 24-hour urine collections and fresh urine samples for sediment analysis.
- Recorded clinical data for all participants.
Main Results:
- Stone formers (SFs) had significantly higher levels of PTH, total and ionized calcium, 1,25 dihydroxyvitamin D3, urinary calcium, and 24-hour urine oxalate compared to non-stone formers (NSFs).
- Hypercalciuria and elevated urinary oxalate were associated with stone formation (OR 4.0 and 7.0, respectively), with a combined OR of 33.5.
- Hypomagnesuria and hypocitraturia were common but not directly associated with increased stone risk.
Conclusions:
- Hypercalciuria, increased oxalate excretion, and severe PHPT are associated with kidney stone formation in PHPT patients.
- These findings highlight key urinary parameters that contribute to nephrolithiasis in the context of PHPT.