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Magnesium deficiency: pathogenesis, prevalence, and clinical implications
Insights
Magnesium deficiency is underdiagnosed, especially in cardiovascular patients on diuretics or digitalis. Supplementation can correct refractory potassium depletion and prevent sudden death risk.
Area of Science:
- Cardiology
- Electrolyte Balance
- Clinical Medicine
Background:
- Hypomagnesemia is a frequently underdiagnosed electrolyte imbalance.
- Patients with cardiovascular disease (CVD) treated with diuretics or digitalis are at high risk for magnesium deficiency.
- Both potassium and magnesium deficiencies are linked to ventricular ectopy and sudden cardiac death.
Purpose of the Study:
- To highlight the underdiagnosis of hypomagnesemia.
- To emphasize the link between magnesium deficiency and cardiovascular health.
- To recommend routine magnesium testing and supplementation.
Main Methods:
- Review of current medical practice regarding electrolyte deficiencies.
- Analysis of patient populations at risk for magnesium depletion (e.g., those on diuretics/digitalis).
- Correlation of electrolyte levels with cardiac events and treatment outcomes.
Main Results:
- Magnesium deficiency is common and often overlooked, particularly in CVD patients.
- Concomitant magnesium depletion can cause refractory potassium repletion.
- Magnesium supplementation can correct refractory hypokalemia.
Conclusions:
- Routine serum magnesium testing is recommended for patients requiring electrolyte level checks, especially those on diuretics or digitalis.
- Both potassium and magnesium should be repleted in hypokalemic patients, as hypomagnesemia may not be evident.
- Potassium-/magnesium-sparing diuretics may aid in preventing these deficiencies.
Abstract:
Hypomagnesemia is probably the most underdiagnosed electrolyte deficiency in current medical practice. Patients with cardiovascular disease who are at greatest risk for the development of magnesium deficiency are those treated with diuretics or digitalis. Both potassium and magnesium deficiencies are associated with increased ventricular ectopy and may increase the risk of sudden unexpected death. Refractory potassium repletion can be caused by concomitant magnesium depletion, and can be corrected with magnesium supplementation. Routine serum magnesium determination is recommended whenever the testing of electrolyte levels is required, especially in patients taking diuretic drugs or digitalis. Because hypomagnesemia is not necessarily present in a magnesium-deficient state, it is recommended that both potassium and magnesium be repleted in patients with hypokalemia. Potassium-/magnesium-sparing diuretics may be helpful in the prevention of these electrolyte deficiencies.