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Persistently elevated parathyroid hormone levels after parathyroid surgery
Tracy S Wang1, Samuel T Ostrower, Keith S Heller
1Section of Head and Neck Surgery, Department of Surgery, Long Island Jewish Medical Center, Albert Einstein College of Medicine, New Hyde Park, NY, USA.
Surgery
|December 20, 2005
Summary
Persistent high parathyroid hormone (PTH) after surgery, despite normal calcium, is linked to low vitamin D and possibly persistent hyperparathyroidism. These findings aid in understanding post-parathyroidectomy outcomes.
Area of Science:
- Endocrinology
- Surgical Oncology
- Metabolic Bone Disease
Background:
- Persistent elevation of serum parathyroid hormone (PTH) despite normocalcemia is a known complication after parathyroidectomy.
- This phenomenon, occurring in 8-40% of patients, has been attributed to hypocalcemia from vitamin D deficiency, bone remineralization, or persistent hyperparathyroidism.
Purpose of the Study:
- To investigate the factors associated with persistent elevated parathyroid hormone (PTH) levels in normocalcemic patients following parathyroidectomy for primary hyperparathyroidism.
- To differentiate between causes of persistent hyperparathyroid hormone (PTH) elevation, including vitamin D deficiency and residual hyperparathyroidism.
Main Methods:
- Retrospective chart review of 816 patients undergoing surgery for primary hyperparathyroidism.
- Analysis of preoperative and postoperative serum parathyroid hormone (PTH), calcium (Ca++), and vitamin D levels.
- Comparison of patient groups based on postoperative PTH and calcium levels.
Main Results:
- Fifteen percent (114 patients) exhibited persistently elevated PTH levels (PPTH).
- Patients with PPTH had higher preoperative PTH, lower postoperative calcium and vitamin D levels compared to those with normalized PTH.
- Mild hypocalcemia and vitamin D deficiency were strongly associated with persistent hyperparathyroid hormone (PTH) elevation, while multiple gland enlargement was less common.
Conclusions:
- Persistent postoperative serum PTH elevation in normocalcemic patients is primarily associated with mild hypocalcemia, likely due to vitamin D deficiency.
- In a subset of patients, persistent hyperparathyroid hormone (PTH) elevation may indicate mild, unresolved hyperparathyroidism.
- Monitoring calcium and vitamin D levels is crucial in patients with persistent hyperparathyroid hormone (PTH) elevation post-parathyroidectomy.