Parathyroidectomy improves hypercalciuria in patients with primary hyperparathyroidism

Area of Science:

• Endocrinology
• Nephrology
• Surgical Oncology

Background:

• Hypercalciuria is a key feature of primary hyperparathyroidism (PHPT).
• Elevated urinary calcium increases the risk of kidney stone formation (nephrolithiasis).

Purpose of the Study:

• To evaluate the effect of parathyroidectomy on 24-hour urinary calcium levels.
• To determine the rate of hypercalciuria resolution post-surgery.

Main Methods:

• Retrospective cohort study of 110 patients undergoing parathyroidectomy for PHPT (2007-2017).
• Analysis of baseline and postoperative serum/urine biochemistry.
• Spearman's rank correlation assessed the relationship between pre- and post-operative urinary calcium.

Main Results:

• 76.4% of patients showed a ≥20% decrease in 24-hour urinary calcium post-surgery.
• Patients with greater improvement had higher baseline urinary calcium, parathyroid hormone, and single-gland disease.
• Of hypercalciuric patients (25%), 79% normalized urinary calcium levels after surgery.
• A predictive linear correlation (R²=0.59) was found between pre- and post-operative urinary calcium levels.

Conclusions:

• Parathyroidectomy effectively reduces 24-hour urinary calcium excretion in most PHPT patients.
• Surgery normalizes hypercalciuria in a significant majority of affected individuals.