Magnesium deficiency and cardiac disorders

Area of Science:

• Cardiology
• Electrophysiology
• Clinical Biochemistry

Background:

• Magnesium deficiency is associated with various medical conditions, including congestive heart failure, diuretic use, digitalis intoxication, and alcoholism.
• Neurologic symptoms like weakness, tremors, and coma, along with serious cardiac arrhythmias, can manifest with magnesium depletion.
• Cardiac arrhythmias, including tachyarrhythmias, are frequently observed in cases of magnesium imbalance.

Purpose of the Study:

• To describe two cases of severe ventricular arrhythmias linked to magnesium depletion.
• To highlight the clinical manifestations of magnesium deficiency, focusing on neurologic and cardiac symptoms.
• To evaluate the efficacy of magnesium sulfate in treating various tachyarrhythmias.

Main Methods:

• Case study of two patients with ventricular arrhythmias and magnesium depletion.
• Intravenous administration of magnesium sulfate (20% solution) followed by a continuous infusion (2% in 5% dextrose).
• Monitoring for recurrence of arrhythmias and potential side effects like hypermagnesemia.

Main Results:

• Both described cases presented with serious ventricular arrhythmias attributed to magnesium depletion.
• Magnesium therapy was effective in managing hypomagnesemic and digitalis-toxic tachyarrhythmias.
• Recurrence of arrhythmias was noted, necessitating further magnesium sulfate infusions in some instances.

Conclusions:

• Magnesium depletion can precipitate severe cardiac arrhythmias, underscoring the importance of monitoring serum magnesium levels.
• Magnesium sulfate is a valuable therapeutic agent for both hypomagnesemic and potentially normomagnesemic tachyarrhythmias.
• Careful monitoring of serum magnesium levels is crucial, especially in patients with renal insufficiency, to avoid hypermagnesemia.