Card Set Information

2012-07-29 23:34:26
AMS1T2 Magnesium Imbalances

Magnesium Imbalances
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  1. Magnesium general info
    • Acts directly on myoneural junction
    • Coenzyme in protein & carbohydrate metabolism
    • Important for cardiac function
    • 50-60% contained in bone
    • Factors regulating Ca2+ balance appear to influence Mg2+ balance
    • Normal 1.4-2.5mEq/L
  2. What is the most common pathology associated with hypermagnesemia?
    Increased intake/ingestion of products containing Mg2+ coupled with renal insufficiency/failure because kidneys are the primary mode of magnesium elimination. 
  3. What are the SnSs of hypermagnesemia?
    • Lethargy-->coma
    • Muscle weakness, loss of deep tendon reflexes, seizure
    • Depressed respirations-->apnea
    • Bradycardia w/peaked T waves
    • Hypotension (secondary to depressed contractility of vasculature)
  4. Nursing intervensions for pt w/hyperMg2+
    • Avoid meds & foods w/Mg2+
    • Frequent Assessment neuro, respiratory, renal, cardiac 
    • If normal renal fxn then diuretics or IV NS to induce Mg2+ loss via urine.
    • May need Ca2+ gluconate to minimize sx because it will have an exact opposite physiological effect on on muscle tissue. 
    • May need dialysis if v renal fnxn.
  5. What are some common pathologies of hypoMg2+
    • Chronic alcoholism due to the alcoholic's tendency toward insuffient food intake.
    • Prolonged fasting/starvation
    • Fluid loss, ie diuretics
    • Prolonged parenteral nutrition w/o supplement
    • Osmotic diuresis from high glucose due to uncontroled DM. 
  6. SnSs of hypoMg2+
    • Tremors, muscle weakness, confusion, coma
    • Hyperirritability, facial twitching, seizure
    • Similar to hypocalcemia
    • Cardiac irritability – dysrhythmia w/increased susceptibility to dig toxicity
  7. Nursing intervensions for hypoMg2+
    • Oral Mg2+ supplements
    • Increase dietary intake of  Mg2+
    • If severe – IV or IM Mg2+