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Predictors of renal function in primary hyperparathyroidism.

Marcella D Walker1, Thomas Nickolas, Anna Kepley

  • 1Departments of Medicine (M.D.W., T.N., A.K., C.Z., D.J.M., S.J.S.) and Surgery (J.A.L.), Columbia University, College of Physicians and Surgeons, New York, New York 10032.

The Journal of Clinical Endocrinology and Metabolism
|February 18, 2014
PubMed
Summary
This summary is machine-generated.

In primary hyperparathyroidism (PHPT), chronic kidney disease (CKD) is linked to traditional risk factors like age and hypertension, not PHPT severity. This suggests focusing on these factors for managing renal function in mild PHPT patients.

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Area of Science:

  • Endocrinology
  • Nephrology
  • Metabolic Bone Disease

Background:

  • Current guidelines recommend parathyroidectomy for primary hyperparathyroidism (PHPT) when estimated glomerular filtration rate (eGFR) is < 60 mL/min per 1.73 m(2).
  • Biochemical abnormalities in PHPT may impair renal function, but data on the association between hypercalcemia, hypercalciuria, or nephrolithiasis and chronic kidney disease (CKD) in mild PHPT are lacking.

Purpose of the Study:

  • To evaluate predictors of renal function in patients with PHPT.
  • To investigate the relationship between PHPT severity indices and renal function.

Main Methods:

  • A cross-sectional study of 114 PHPT patients, categorized by eGFR (<60 mL/min/1.73 m(2) or ≥60 mL/min/1.73 m(2)).
  • Multiple linear regression analysis was used to identify predictors of renal function (eGFR).

Main Results:

  • Lower eGFR was associated with age, hypertension, antihypertensive medication use, fasting glucose, and 25-hydroxyvitamin D.
  • eGFR showed a positive association with nephrolithiasis, 24-hour urinary calcium excretion, and 1,25-dihydroxyvitamin D, but not serum calcium or PTH.
  • 15% of patients had stage 3 CKD; these patients were older, more likely hypertensive, and had higher 25-hydroxyvitamin D and lower 1,25-dihydroxyvitamin D levels.
  • Age and diastolic blood pressure were negatively associated with eGFR, while serum calcium, kidney stones, and alcohol use were positive predictors.

Conclusions:

  • PHPT patients with stage 3 CKD do not exhibit more severe hyperparathyroidism biochemically or clinically compared to those without CKD.
  • Traditional risk factors, rather than PHPT-specific indices, are associated with reduced eGFR in mild PHPT.
  • These findings suggest that management of traditional risk factors may be crucial for preserving renal function in mild PHPT.