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Calcium and phosphate metabolism in acromegaly
Acta Endocrinologica
|August 1, 1980
Summary
Acromegaly patients show altered calcium and phosphate levels, with increased urinary calcium linked to gut hyperabsorption. The study suggests parathyroid hyperactivity is a common feature in acromegaly.
Area of Science:
- Endocrinology
- Metabolic Disorders
Background:
- Acromegaly, a condition caused by excess growth hormone, can affect mineral metabolism.
- Understanding these metabolic changes is crucial for managing the disorder.
Purpose of the Study:
- To investigate calcium and phosphate metabolism in patients with active acromegaly.
- To determine the relationship between hormonal levels and mineral imbalances.
Main Methods:
- Studied 28 patients with active acromegaly, comparing them to controls.
- Measured serum calcium, phosphate, immunoreactive parathyroid hormone (PTH), and urinary calcium and cAMP levels.
- Assessed tubular re-absorption of calcium and TmP/GFR.
Main Results:
- Patients with acromegaly exhibited elevated serum calcium and urinary calcium, with normal calcium tubular re-absorption.
- A negative correlation between urinary cAMP and calcium excretion suggested gut hyperabsorption.
- Increased serum phosphate and TmP/GFR were observed.
- Elevated immunoreactive parathyroid hormone (PTH) was found in some patients, correlating with hypercalcemia.
Conclusions:
- Parathyroid hyperactivity appears to be a characteristic feature of acromegaly.
- Gut hyperabsorption of calcium contributes to hypercalciuria in acromegaly.
- Acromegaly significantly impacts calcium and phosphate homeostasis.