endocrine and metabolic disorders
Hypomagnesemia
Introduction
Hypomagnesemia is serum magnesium concentration<1.8 mg/dL (<0.70 mmol/L). Causes include inadequate magnesium intake and absorption or increased excretion due to hypercalcemia or medications such asfurosemide. Clinical features are often due to accompanying hypokalemia and hypocalcemia and include lethargy, tremor, tetany, seizures, and arrhythmias. Treatment is with magnesium replacement. (See also Overview of Disorders of Magnesium Concentration .) Serum magnesium concentration, even when free magnesium ion is measured, may be normal even with decreased intracellular or bone magnesium stores. 