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Theme: Magnesium!
  1. M Davey
  1. Emergency Department, Royal Adelaide Hospital, South Australia, Australia
  1. Correspondence to Dr M Davey, Emergency Department, Royal Adelaide Hospital, Adelaide 5000, Australia; michael.davey{at}health.sa.gov.au

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Question 1

Which of the following are true regarding magnesium physiology?

  1. Serum magnesium concentration closely parallels total body magnesium levels.

  2. It is a divalent cation of pivotal importance to the function of the sodium–potassium ATPase pump.

  3. Renal magnesium reabsorption occurs mainly in the thick ascending limb of the loop of Henle.

  4. Magnesium depletion is common in alcoholism, users of diuretics, diabetic ketoacidosis and patients admitted to intensive care units.

Question 2

Which of the following are true regarding the clinical utility of magnesium sulphate (MgSO4)?

  1. MgSO4 administered intravenously has proved to be of clinical benefit in severe asthma.

  2. MgSO4 is more effective than phenytoin …

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