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Published on: September 27, 2024
Hyponatremia-induced osteoporosis.
Joseph G Verbalis1, Julianna Barsony, Yoshihisa Sugimura
1Division of Endocrinology and Metabolism, Georgetown University, Washington, DC 20007, USA. verbalis@georgetown.edu
Summary
Chronic hyponatremia, common in the elderly, significantly reduces bone density and increases osteoporosis risk. This study in rats and humans suggests hyponatremia directly impacts bone mass, necessitating bone quality assessment in affected patients.
Area of Science:
- Endocrinology
- Geriatrics
- Bone Metabolism
Background:
- Chronic hyponatremia is prevalent in the elderly, often due to syndrome of inappropriate antidiuretic hormone secretion (SIADH).
- Mild hyponatremia is linked to impaired gait stability and increased fall risk in older adults.
- The potential metabolic contribution of hyponatremia to bone loss remained unevaluated.
Purpose of the Study:
- To investigate the impact of chronic hyponatremia on bone mass and quality.
- To determine if hyponatremia contributes to bone loss and increases osteoporosis risk.
Main Methods:
- A rat model of SIADH was used to assess bone mineral density (BMD) via dual-energy X-ray absorptiometry (DXA).
- Micro-computed tomography (microCT) and histomorphometry analyzed trabecular and cortical bone changes in rats.
- Data from the National Health and Nutrition Examination Survey III (NHANES III) were analyzed using linear regression models in adult humans.
Main Results:
- In rats, 3-month hyponatremia significantly reduced femur BMD by approximately 30% compared to controls.
- Hyponatremia in rats led to reduced bone mass through increased bone resorption and decreased bone formation.
- NHANES III data showed mild hyponatremia associated with increased odds of osteoporosis at the hip (OR = 2.85; p < .01), adjusted for multiple covariates.
Conclusions:
- This study provides the first evidence that chronic hyponatremia causes substantial bone mass reduction.
- Human data indicate an association between hyponatremia and increased odds of osteoporosis.
- Bone quality assessment is recommended for all patients diagnosed with chronic hyponatremia.
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