Magnesium: Difference between revisions
(Rossdonaldson1 moved page Magnesium to Magnesium sulfate) |
(Create lab page for Magnesium with EM-focused content and references) Tag: Removed redirect |
||
| Line 1: | Line 1: | ||
==Background== | |||
*Second most abundant intracellular cation; critical for enzymatic reactions, cardiac stability, and neuromuscular function | |||
*Serum levels reflect only ~1% of total body stores | |||
==Normal Values== | |||
*Normal: 1.7-2.2 mg/dL | |||
==Interpretation== | |||
*Hypomagnesemia is common in ED patients (alcoholism, diuretic use, diarrhea, malnutrition) | |||
**Must be corrected for effective potassium repletion | |||
**Can cause refractory hypokalemia and hypocalcemia | |||
**ECG: prolonged QT, torsades de pointes | |||
**Treat: IV magnesium sulfate 2g over 15-60 min | |||
*Hypermagnesemia (>2.2 mg/dL) is rare; usually iatrogenic or from renal failure | |||
**Progression: loss of DTRs (>4), respiratory depression (>6), cardiac arrest (>12) | |||
**Treat with IV calcium and cessation of magnesium | |||
==See Also== | |||
*[[Hypomagnesemia]] | |||
*[[Hypermagnesemia]] | |||
*[[Magnesium sulfate]] | |||
*[[BMP]] | |||
==References== | |||
<references/> | |||
[[Category:Labs]] | |||
Latest revision as of 06:58, 22 March 2026
Background
- Second most abundant intracellular cation; critical for enzymatic reactions, cardiac stability, and neuromuscular function
- Serum levels reflect only ~1% of total body stores
Normal Values
- Normal: 1.7-2.2 mg/dL
Interpretation
- Hypomagnesemia is common in ED patients (alcoholism, diuretic use, diarrhea, malnutrition)
- Must be corrected for effective potassium repletion
- Can cause refractory hypokalemia and hypocalcemia
- ECG: prolonged QT, torsades de pointes
- Treat: IV magnesium sulfate 2g over 15-60 min
- Hypermagnesemia (>2.2 mg/dL) is rare; usually iatrogenic or from renal failure
- Progression: loss of DTRs (>4), respiratory depression (>6), cardiac arrest (>12)
- Treat with IV calcium and cessation of magnesium