Hypercalcemic and hypocalcemic disorders: diagnosis and treatment

Area of Science:

• Endocrinology
• Metabolic Bone Disease

Background:

• Hypercalcemia and hypocalcemia are significant clinical challenges with diverse etiologies.
• Disruptions in vitamin D metabolism are central to many calcium balance disorders.
• Understanding these mechanisms is crucial for effective patient management.

Purpose of the Study:

• To review current concepts on the mechanisms, diagnosis, and treatment of major causes of hypercalcemia and hypocalcemia.
• To specifically examine the role of vitamin D metabolism abnormalities.
• To discuss the therapeutic applications of vitamin D and its metabolites.

Main Methods:

• Literature review of current concepts and clinical practices.
• Analysis of the role of vitamin D and its metabolites in calcium homeostasis.
• Discussion of diagnostic criteria and treatment strategies for calcium disorders.

Main Results:

• Abnormalities in vitamin D metabolism include excessive hepatic production of 25-hydroxyvitamin D (vitamin D intoxication).
• Increased production of 1 alpha, 25-dihydroxyvitamin D is linked to hyperparathyroidism and sarcoidosis.
• Impaired production or resistance to 1 alpha, 25-dihydroxyvitamin D is observed in conditions like hypoparathyroidism and renal failure.

Conclusions:

• Vitamin D metabolism plays a critical role in calcium homeostasis and the pathogenesis of hypercalcemia and hypocalcemia.
• Accurate diagnosis relies on understanding these metabolic pathways.
• Therapeutic strategies involve targeted use of vitamin D and its active metabolites.