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Predictors of Renal Function and Calcifications in Primary Hyperparathyroidism: A Nested Case-Control Study.

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Renal calcifications are common in primary hyperparathyroidism (PHPT), affecting 23% of patients. Higher calcium and parathyroid hormone levels predict these calcifications, highlighting disease severity.

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Area of Science:

  • Endocrinology
  • Nephrology
  • Metabolic Bone Disease

Background:

  • Primary hyperparathyroidism (PHPT) is a metabolic disorder often associated with renal complications.
  • Renal calcifications, including nephrolithiasis and nephrocalcinosis, are recognized complications of PHPT.
  • Understanding the prevalence and predictors of renal calcifications is crucial for patient management.

Purpose of the Study:

  • To determine the prevalence of renal calcifications in patients with PHPT.
  • To identify biochemical predictors associated with renal calcifications in PHPT patients.

Main Methods:

  • A nested case-control study was conducted at a university hospital.
  • 792 patients with PHPT diagnosed between 2005 and 2015 were identified.
  • Renal calcifications (nephrolithiasis/nephrocalcinosis) were assessed via CT scan; biochemical data were analyzed.

Main Results:

  • 23% of 617 PHPT patients with CT scans had renal calcifications (12% nephrolithiasis, 12% nephrocalcinosis).
  • Patients with renal calcifications exhibited higher ionized calcium, parathyroid hormone, and 24-hour calcium excretion (P < 0.01).
  • Nephrocalcinosis was linked to higher phosphate and calcium-phosphate product compared to nephrolithiasis.

Conclusions:

  • Renal calcifications are a frequent complication of PHPT, occurring in nearly a quarter of patients.
  • The presence and severity of renal calcifications correlate with biochemical markers of PHPT severity.
  • While impaired renal function is common in PHPT, it was not directly associated with renal calcifications in this cohort.