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Calcium Metabolism Disorder – Causes and Treatment

A calcium metabolism disorder refers to an imbalance of calcium levels in the blood. It can lead to hypercalcemia or hypocalcemia and affects bones, nerves, and muscles.

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Things worth knowing about "Calcium Metabolism Disorder"

A calcium metabolism disorder refers to an imbalance of calcium levels in the blood. It can lead to hypercalcemia or hypocalcemia and affects bones, nerves, and muscles.

What is a Calcium Metabolism Disorder?

A calcium metabolism disorder occurs when calcium levels in the blood are persistently too high (hypercalcemia) or too low (hypocalcemia). Calcium is an essential mineral required for bone integrity, muscle contraction, nerve transmission, and cardiac function. In a healthy body, calcium levels are tightly regulated through a complex interaction between hormones, the kidneys, and the intestines. When this regulatory system is disrupted, a wide range of symptoms can develop.

Causes

The causes of a calcium metabolism disorder vary depending on whether there is an excess or deficiency of calcium.

Causes of Hypercalcemia (too much calcium)

Primary hyperparathyroidism: Overproduction of parathyroid hormone (PTH) by the parathyroid glands
Malignant tumors: Bone metastases or tumor-related PTH-like substances
Excessive vitamin D intake (vitamin D toxicity)
Sarcoidosis and other granulomatous diseases
Prolonged immobilization

Causes of Hypocalcemia (too little calcium)

Hypoparathyroidism: Insufficient PTH production, often following thyroid or parathyroid surgery
Vitamin D deficiency due to inadequate sun exposure or poor dietary intake
Malabsorption syndromes (e.g., celiac disease, Crohn's disease)
Renal insufficiency with impaired vitamin D activation
Magnesium deficiency, which impairs PTH function
Certain medications such as bisphosphonates or loop diuretics

Symptoms

Symptoms of Hypercalcemia

Fatigue, muscle weakness, and difficulty concentrating
Nausea, vomiting, and constipation
Frequent urination and increased thirst (polyuria, polydipsia)
Kidney stones
Cardiac arrhythmias
In severe cases: confusion, stupor, or coma

Symptoms of Hypocalcemia

Tetany: Muscle cramps, tingling, and numbness (especially in hands, feet, and face)
Muscle twitching and spasms
Cardiac arrhythmias (prolonged QT interval)
Depression, anxiety, and confusion
Brittle nails, dry skin, and hair loss in chronic cases

Diagnosis

Diagnosis of a calcium metabolism disorder begins with a blood test measuring total serum calcium as well as ionized (free) calcium. Since calcium levels depend on albumin concentrations, an albumin-corrected calcium value is often calculated. Additional laboratory parameters include:

Parathyroid hormone (PTH)
Vitamin D (25-OH-vitamin D)
Phosphate and magnesium
Kidney function markers (creatinine, urea)
Calcitonin (if thyroid disease is suspected)

Imaging studies such as ultrasound of the parathyroid glands, bone density measurement (DXA scan), or scintigraphy may be used as supplementary diagnostics.

Treatment

Treatment of Hypercalcemia

Adequate fluid intake (intravenous saline solution in acute cases)
Bisphosphonates to inhibit bone resorption
Calcitonin for rapid lowering of calcium levels
Treatment of the underlying cause (e.g., surgery for primary hyperparathyroidism)
Corticosteroids for granulomatous diseases

Treatment of Hypocalcemia

Oral or intravenous calcium supplementation depending on severity
Vitamin D supplementation (cholecalciferol or active metabolites such as calcitriol)
Treatment of the underlying condition (e.g., gluten-free diet for celiac disease)
Magnesium replacement when concurrent deficiency is present

Prognosis and Course

The prognosis of a calcium metabolism disorder depends largely on the underlying cause. Many forms respond well to treatment, especially when identified early. However, untreated severe cases can lead to kidney damage, cardiac complications, or osteoporosis. Regular follow-up monitoring is essential in chronic forms of the condition.

References

Bilezikian J. P. et al. - Guidelines for the Management of Asymptomatic Primary Hyperparathyroidism. Journal of Clinical Endocrinology and Metabolism, 2022.
Shoback D. - Hypoparathyroidism. New England Journal of Medicine, 2008; 359: 391-403.
Goltzman D. - Approach to Hypercalcemia. In: Feingold K. R. et al. (eds.), Endotext. MDText.com, 2023. Available at: www.ncbi.nlm.nih.gov/books/NBK279129/

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