Coexisting hyperparathyroidism with thyrotoxicosis.

Abstract:

:The coexistence of hyperparathyroidism complicating thyrotoxicosis is quite rare. We report the case of one patient who presented with thyrotoxicosis, (total thyroxine of 15.1 micrograms/dl (5-13), free thyroxine index of 18 (4-15) and triiodothyronine by RIA of 305 ng/dl (70-230) and asymptomatic hypercalcemia of 15 mg/dl (8.5-10.6), who was also initially noted to have an elevated (C-terminal) serum immunoreactive parathyroid hormone (iPTH) level of 8,800 pg/ml (50-340). With propylthiouracil and propranolol, however, this patient became normocalcemic with a decrease in iPTH values to 714 pg/ml. As the patient was tapered from medication, after being rendered euthyroid, a recurrence of hypercalcemia with rising iPTH levels occurred. PTH levels should be helpful in defining coexisting hyperparathyroidism in patients with thyrotoxicosis since in the latter iPTH is usually suppressed. Our findings support the recommendation that in patients suspected of having both hyperparathyroidism and hyperthyroidism, a diagnosis of the former can only be made with certainty after the patient has been rendered euthyroid with persistently elevated serum calcium and iPTH levels. While there are no clinical features which permit the easy identification of patients who present with dual lesions, the determination of iPTH values may be the most consistently helpful test initially, whereas other parameters such as vitamin D, serum phosphate are less reliable.

journal_name

J Endocrinol Invest

authors

McGowan DM,Vaswani A,Shperling I

doi

10.1007/BF03346819

subject

Has Abstract

pub_date

1991-04-01 00:00:00

pages

305-10

issue

4

eissn

0391-4097

issn

1720-8386

journal_volume

14

pub_type

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