Serum magnesium concentrations in atrial fibrillation

Area of Science:

• Cardiology
• Clinical Pharmacology
• Biochemistry

Background:

• Atrial fibrillation is a common arrhythmia often managed with digoxin.
• Digoxin efficacy can be influenced by electrolyte levels.
• Chronic rheumatic heart disease is a known cause of atrial fibrillation.

Purpose of the Study:

• To investigate the relationship between serum magnesium levels and digoxin treatment in patients with atrial fibrillation.
• To assess the prevalence of hypomagnesemia in this patient group.
• To evaluate the effect of magnesium supplementation on ventricular rate control.

Main Methods:

• Serum magnesium and digoxin levels were measured in 13 patients with atrial fibrillation.
• Ventricular rates were monitored.
• Comparison was made with healthy controls.
• Magnesium sulfate was administered to hypomagnesemic patients.

Main Results:

• A good correlation was observed between serum digoxin levels and ventricular rates.
• Hypomagnesemia was prevalent, affecting 7 out of 13 patients.
• Mean serum magnesium levels were significantly lower in patients compared to controls.
• Magnesium sulfate administration successfully controlled ventricular rates in deficient patients.

Conclusions:

• Hypomagnesemia is common in patients with atrial fibrillation on digoxin therapy.
• Magnesium deficiency may impact digoxin's effectiveness in rate control.
• Magnesium supplementation is a viable strategy for managing ventricular rates in hypomagnesemic patients.