Magnesium 33722-3

Question 0

Magnesium - Actions (3)

Answer 0

• (anticonvulsant) Tx/prophylaxis of sz due to toxemia of pregnancy (eclampsia)
• reduces chance of post infarction ventricular arrhythmias by increasing membrane stability and decreasing ventricular excitability
• may result in relaxation of bronchial and vascular smooth muscle which is probably secondary to Ca blockade

Question 1

Magnesium - Class (3)

Answer 1

• electrolyte
• CNS depressant
• anticonvulsant

Question 2

Magnesium - Indications (7)

Answer 2

• refactory VF/VT
• Torsades de pointes
• refractory sz related to hypomag in alcoholics
• eclampsia
• hyper-reflex of toxemia of pregnancy (pre-eclampsia)
• cardiac arrhythmias due to dig toxicity
• controversial: refractory bronchospasm not responsive to Beta agonist/steroid/aminophyline

Question 3

Magnesium - Contraindications (2)

Answer 3

• heart block

- controversy in acute MI pt

Question 4

Magnesium - Side Effects (2)

Answer 4

• Rapid admin: flushing/hypotension/sweating/mild bradycardia
• Hypermagnesemia: may produce depressed reflexes, flaccid paralysis, circulatory collapse, respiratory depression/paralysis, and diarrhea

Question 5

Magnesium - Precautions (3)

Answer 5

• monitor respiratory rate due to resp. depression side effect
• IV CaCh available as antagonist
• concurrent use w/ CNS depressant req lower dosage