Intravenous magnesium for cardiac arrhythmias: jack of all trades

Area of Science:

• Cardiology
• Electrophysiology
• Pharmacology

Background:

• Intravenous magnesium is utilized for preventing and treating cardiac arrhythmias.
• Magnesium exerts diverse electrophysiological effects on the heart's conduction system.

Purpose of the Study:

• To review the electrophysiological actions of intravenous magnesium.
• To summarize its reported clinical utility in various cardiac arrhythmias.
• To identify arrhythmias where magnesium is not effective and areas for future research.

Main Methods:

• Literature review of studies on intravenous magnesium and cardiac arrhythmias.
• Analysis of magnesium's electrophysiological effects on cardiac conduction.
• Synthesis of reported clinical outcomes in different arrhythmia types.

Main Results:

• Magnesium prolongs sinus node recovery time and reduces automaticity and conduction.
• It is effective in preventing arrhythmias post-cardiac surgery, managing atrial fibrillation, and treating specific drug-induced arrhythmias.
• Magnesium is not effective for monomorphic ventricular tachycardia and shock-resistant ventricular fibrillation.

Conclusions:

• Intravenous magnesium has a broad range of electrophysiological actions beneficial for certain arrhythmias.
• Its application is established in specific clinical scenarios, but not universally.
• Further large-scale randomized controlled studies are required to confirm its impact on patient-centered outcomes in diverse cardiac arrhythmias.