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JOURNAL ARTICLE
REVIEW
Significance of elevated parathyroid hormone after parathyroidectomy.
Endocrine Practice 2010
OBJECTIVE: To review the prevalence of parathyroid hormone elevation after parathyroidectomy for primary hyperparathyroidism and to discuss possible mechanisms.
METHODS: A Medline search of the English-language literature published between 1990 and 2009 was performed using the search terms "elevated PTH after parathyroidectomy." All of the identified articles reported either prospective or retrospective studies without control groups. Studies that included patients with secondary or tertiary hyperparathyroidism were not reviewed.
RESULTS: Within 1 week to 5 years after parathyroidectomy, 9% to 62% of patients with a normal serum calcium concentration are reported to have an elevated parathyroid hormone concentration. No evidence suggests that postoperative normocalcemic parathyroid hormone elevation is an indication of surgical failure and recurrent hypercalcemia. Preoperative findings in patients with postoperative parathyroid hormone elevation include lower vitamin D concentration, higher concentrations of bone turnover markers, and higher parathyroid hormone concentration. Potential mechanisms for parathyroid hormone elevation in the setting of normocalcemia include vitamin D deficiency, hungry bone syndrome, and parathyroid hormone resistance. Study findings suggest a possible benefit of postoperative calcium and vitamin D supplementation, but no randomized trials have been done.
CONCLUSION: Elevation of parathyroid hormone commonly occurs after parathyroidectomy for primary hyperparathyroidism, although the underlying mechanism remains unclear.
METHODS: A Medline search of the English-language literature published between 1990 and 2009 was performed using the search terms "elevated PTH after parathyroidectomy." All of the identified articles reported either prospective or retrospective studies without control groups. Studies that included patients with secondary or tertiary hyperparathyroidism were not reviewed.
RESULTS: Within 1 week to 5 years after parathyroidectomy, 9% to 62% of patients with a normal serum calcium concentration are reported to have an elevated parathyroid hormone concentration. No evidence suggests that postoperative normocalcemic parathyroid hormone elevation is an indication of surgical failure and recurrent hypercalcemia. Preoperative findings in patients with postoperative parathyroid hormone elevation include lower vitamin D concentration, higher concentrations of bone turnover markers, and higher parathyroid hormone concentration. Potential mechanisms for parathyroid hormone elevation in the setting of normocalcemia include vitamin D deficiency, hungry bone syndrome, and parathyroid hormone resistance. Study findings suggest a possible benefit of postoperative calcium and vitamin D supplementation, but no randomized trials have been done.
CONCLUSION: Elevation of parathyroid hormone commonly occurs after parathyroidectomy for primary hyperparathyroidism, although the underlying mechanism remains unclear.
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