ISSN 2398-2985      

Hypercalcemia

6guinea pig
Contributor(s):

Vicki Baldrey

Anna Meredith

Synonym(s): High calcium levels


Introduction

  • Cause: diet, neoplasia, chronic renal failure, impaired calcium excretion, vitamin D toxicosis.
  • Signs: calciuria, urolithiasis, metastatic calcification of tissues.
  • Diagnosis: biochemistry, diagnostic imaging.
  • Treatment: reduce calcium intake, fluid therapy, treat underlying cause.
  • Prognosis: depends on cause.

Pathogenesis

Etiology

  • May occur secondary to chronic renal failure.
  • Excessive vitamin D supplementation may lead to hypercalcemia and metastatic calcification of tissues.
  • Primary or secondary hyperparathyroidism.
  • Osteolytic bone tumors.
  • Laboratory error and sample hemolysis should be ruled out.

Predisposing factors

General

  • High calcium diet.
  • High vitamin D in diet or excessive supplementation.
  • Chronic renal failure.

Pathophysiology

  • Hypercalcemia is the result of increased uptake from gastrointestinal system, excessive release from bone, or decreased renal excretion of calcium.
  • Parathyroid hormone activates osteoclasts, with release of calcium from bone. PTH also promotes renal conservation of calcium and stimulate the synthesis of active vitamin D by the kidneys.
  • Vitamin D and its analogues increase gastrointestinal uptake of calcium. At high levels, calcium is also released from bone.
  • Osteolytic processes result in release of calcium and phosphorus from bone.

Timecourse

  • Usually chronic.

Diagnosis

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Treatment

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Prevention

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Outcomes

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Further Reading

Publications

Refereed Papers

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