Hypomagnesemia
Background
- Hypokalemia, Hypocalcemia and hypophosphatemia are often also present
Clinical Features
- CNS
- GI
- Cardiovascular
- CHF
- Dysrhythmias
- Hypotension
- Miscellaneous
Differential Diagnosis
Causes of hypomagnesemia
- ETOH
- Malnutrition
- Cirrhosis
- Pancreatitis
- After DKA
- GI loss (especially diarrhea)
- Renal wasting
- Type 2 diabetes mellitus[1]
Evaluation
- Magnesium level
- Also check:
- Chemistry
- Phosphate
Management
- Serum level >1.7
- No treatment
- Serum level 1.2 - 1.7
- Asymptomatic
- Oral repletion with magnesium oxide 400mg PO
- Magnesium oxide 400mg = 2g of MgSO4
- Oral repletion with magnesium oxide 400mg PO
- Symptomatic (or no POs)
- 2g MgSO4 IV over 1 hour
- Asymptomatic
- Serum level <1.2
- 4g MgSO4 IV over 2 hours
Disposition
See Also
- Electrolyte Abnormalities (Main)
- Magnesium
External Links
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