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Electrolyte Disturbances and Disorders of Mineral Metabolism in the Elderly

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Abstract

With normal ageing physiological alterations in water and sodium regulation and associated changes in the renal and hormonal systems may contribute to relative frequency of water and electrolyte disorders. In the elderly glomerular filtration rate falls and water homeostasis falls due to decrease in thirst sensation. Water homeostasis falls due to the thirst sensation decreasing with age. Hence the ability to withstand disease-related environmental stress or iatrogenic stress becomes increasingly narrowed in the elderly. Dehydration is a frequent cause of morbidity and mortality in the elderly. The hormones aldosterone, antidiuretic hormone (ADH) and atrial natriuretic peptide (ANP) regulate the fluid and electrolyte balance and partly control the changes in fluid balance in the elderly. Disturbances of potassium homeostasis present as low or high serum potassium and are common among hospitalised patients. The metabolism of calcium and vitamin D is altered in a number of ways by ageing.

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Appendices

Multiple Choice Questions

  1. 1.

    The following associated with hypercalcaemia are true, EXCEPT:

    1. A.

      Malignancy and hyperparathyroidism are the most common causes of hypercalcaemia.

    2. B.

      In case of hypercalcaemia due to malignancy (to have a tumour),in some the PTHrP is elevated.

    3. C.

      Hypercalcaemia occurs with immobilisation especially high-risk patients are those associated with Paget’s disease.

    4. D.

      Hypercalcaemia caused by vitamin excess is usually due to calcitriol characterised by elevation of calcium, PO4 and serum PTH.

  2. 2.

    In the elderly the following which may contribute to the development of hyponatraemia are true, EXCEPT:

    1. A.

      There is increase in the percentage of body water with ageing.

    2. B.

      There is a decline in the glomerular filtration rate.

    3. C.

      There is increased incidence of renal diseases with advancing years.

    4. D.

      Thirst increases with ageing with loss of water in the urine and inability to concentrate urine.

  3. 3.

    The following are true in relation to hyponatraemia in the elderly, EXCEPT:

    1. A.

      The secretion of aldosterone is altered in the elderly and atrial naturetic peptide is decreased in the elderly fivefold.

    2. B.

      Serum osmolality and sodium concentration are controlled by thirst, antidiuretic hormone and the kidney.

    3. C.

      In SIADH in spite of low osmolality, antidiuretic hormone release is not fully suppressed.

    4. D.

      SIADH is known to occur without an identifiable cause in the elderly.

Answers to MCQs

1 = D; 2 = D; 3 = D

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Nagaratnam, N., Nagaratnam, K., Cheuk, G. (2016). Electrolyte Disturbances and Disorders of Mineral Metabolism in the Elderly. In: Diseases in the Elderly. Springer, Cham. https://doi.org/10.1007/978-3-319-25787-7_11

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  • DOI: https://doi.org/10.1007/978-3-319-25787-7_11

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-25785-3

  • Online ISBN: 978-3-319-25787-7

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