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Magnesium deficiency: pathophysiologic and clinical overview

S M al-Ghamdi1, E C Cameron, R A Sutton

  • 1Department of Medicine, University of British Columbia, Vancouver General Hospital, Canada.

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
|November 1, 1994
PubMed
Summary
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Magnesium (Mg) is vital for many bodily functions. Low serum Mg (hypomagnesemia) is common in hospitals and can cause serious health issues, but can be detected and treated.

Area of Science:

  • Biochemistry
  • Human Physiology
  • Clinical Medicine

Background:

  • Magnesium (Mg) is an essential cation crucial for numerous enzymatic reactions and metabolic processes.
  • Serum Mg levels are tightly regulated by the kidneys and small intestine, with bone stores contributing during depletion.
  • Hypomagnesemia is prevalent in hospitalized patients, particularly in intensive care units, often masking intracellular Mg deficiency.

Purpose of the Study:

  • To review the causes, clinical presentations, and management of magnesium deficiency.
  • To highlight the diagnostic challenges and therapeutic considerations for hypomagnesemia.

Main Methods:

  • Literature review of magnesium's role in biological systems.
  • Analysis of causes of hypomagnesemia, including gastrointestinal, renal, and iatrogenic factors.

Related Experiment Videos

  • Discussion of clinical manifestations and diagnostic approaches such as urine Mg concentration and parenteral Mg load tests.

    • Main Results:

    • Hypomagnesemia can result from malabsorption, renal wasting (e.g., diuretics, certain medications), or cellular redistribution.
    • Conditions like alcoholism and diabetes are frequently associated with Mg deficiency.
    • Clinical presentations include neuromuscular irritability, cardiac arrhythmias, and refractory hypokalemia/hypocalcemia.

    Conclusions:

    • Accurate diagnosis of Mg deficiency may require urine or load tests, as serum levels can be misleading.
    • Treatment strategies for hypomagnesemia depend on clinical status, deficiency severity, and renal function.
    • Recognizing and managing magnesium deficiency is critical for improving patient outcomes.