endocrine and metabolic disorders
Hypermagnesemia
Diagnosis of Hypermagnesemia
Serum magnesium concentrations>2.6 mg/dL (>1.05 mmol/L) At serum magnesium concentrations of 6 to 12 mg/dL (2.5 to 5 mmol/L), the ECG shows prolongation of the PR interval, widening of the QRS complex, and increased T-wave amplitude. Deep tendon reflexes disappear as the serum magnesium concentration approaches 12 mg/dL (5.0 mmol/L); hypotension, respiratory depression, and narcosis develop with increasing hypermagnesemia. Cardiac arrest may occur when blood magnesium concentration is>15 mg/dL (6.0 to 7.5 mmol/L). 