Magnesium

what is the normal range for magnesium?

1.3–2.3 mEq/L

where is magnesium found?

in the intracellular fluid

• second most abundant ICF cation after potassium

key roles of magnesium

• supports nerve and muscle function

• permits muscle relaxation

• promotes vasodilation to help regulate BP

what affect does magnesium have on muscles?

it relaxes them

what hormone regulates magnesium balance?

parathyroid hormone (PTH)

what is the relationship between magnesium and potassium

they interact and can compete

• low magnesium makes potassium imbalances harder to correct

if magnesium is low, what is probably also low?

calcium

• both influenced by PTH

pattern to remember for magnesium levels

• low magnesium = excited, hyperactive

• high magnesium = calm and quiet

main systems affected by magnesium shifts

• neuromuscular

• cardiovascular (rhythm and BP)

• CNS