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Hypermagnesemia
AKA: hypermagnesaemia
Evaluation and management of elevated blood magnesium in pediatric patients
Causes
- Decreased GFR → ↓ filtration and ↓ phosphorus excretion
- Large intake of magnesium (e.g., antacids, laxatives, IV fluids, maternal intake in newborns)
Excessive magnesium intake
- Laxative, bowel prep
- IV fluids
- Supplementation
Signs and symptoms
- Usually asymptomatic unless extremely high
- Loss of deep tendon reflexes (DTRs)
- Weakness
- Cardiac dysrhythmias
- Coma
Evaluation
- Evaluate history for sources of excessive magnesium intake
- Labs:
- Kidney function
Treatment
- Reduce intake of magnesium
- Volume expansion and/or loop diuretics if no improvement despite reduction of intake
- Administer calcium if severe and/or symptomatic