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Related Experiment Videos

Functional magnesium deficiency in critically ill patients identified using a magnesium-loading test

P Hébert1, N Mehta, J Wang

  • 1Department of Pathology, Ottawa General Hospital, University of Ottawa, ON, Canada.

Critical Care Medicine
|May 1, 1997
PubMed
Summary

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The magnesium-loading test is feasible for critically ill patients and helps identify magnesium deficiency. However, serum ionized magnesium levels may not accurately reflect this deficiency in these patients.

Area of Science:

  • Critical Care Medicine
  • Clinical Chemistry
  • Nutritional Science

Background:

  • Magnesium deficiency is common in critically ill patients.
  • Accurate assessment of magnesium status is crucial for effective treatment.
  • Existing biochemical markers may have limitations in this population.

Purpose of the Study:

  • To evaluate the feasibility of the magnesium-loading test in critically ill patients.
  • To validate serum ionized magnesium assays against the magnesium-loading test.
  • To identify functional magnesium deficiency in the critically ill.

Main Methods:

  • A double-blind, randomized, controlled trial was conducted in a tertiary intensive care unit.
  • Forty-four critically ill patients without renal insufficiency received either magnesium sulfate or saline for 3 days.

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  • Serial serum biochemistry and 24-hour urine collections were performed.

    • Main Results:

    • The magnesium-loading test was feasible and demonstrated significant increases in serum magnesium levels.
    • Magnesium-loaded patients showed increased magnesium excretion compared to controls.
    • Patients were classified as functional magnesium-deficient retainers or nonretainers based on excretion rates.

    Conclusions:

    • The magnesium-loading test is a feasible and valid method for assessing magnesium status in critically ill patients.
    • Serum ionized magnesium appears to be an insensitive marker for functional hypomagnesemia in this group.
    • Further research is needed to determine the prevalence and risk factors of magnesium deficiency in the critically ill.