Anterior Upper Lateral Versus Anterior-Lateral Electrode Positions for External Cardioversion in Atrial Fibrillation

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Electrical cardioversion is the primary treatment for symptomatic persistent atrial fibrillation (AF).
• Current standard electrode positions (anterior-posterior, anterior-lateral) are ineffective in over 10% of patients.
• There is a need for improved cardioversion techniques to increase success rates.

Purpose of the Study:

• To evaluate the efficacy and safety of anterior upper lateral electrode positioning for external cardioversion in patients with AF.
• To compare the success rates of anterior upper lateral positioning against the standard anterior-lateral positioning.

Main Methods:

• A randomized, open-label trial involving 333 patients with AF undergoing elective cardioversion.
• Patients were assigned to either anterior upper lateral or anterior-lateral electrode positioning groups.
• Primary outcome: proportion of patients achieving sinus rhythm after the first shock; Secondary outcome: sinus rhythm after up to three shocks.

Main Results:

• The anterior upper lateral group showed a significantly higher success rate for sinus rhythm after the first shock (75% vs. 53%).
• Overall success after up to three shocks was also higher in the anterior upper lateral group (93% vs. 85%).
• No significant differences in safety outcomes, including arrhythmias and skin irritation, were observed between the groups.

Conclusions:

• Anterior upper lateral electrode positioning is a more effective strategy than anterior-lateral positioning for biphasic cardioversion in AF.
• This novel positioning enhances cardioversion success without increasing adverse events.
• The findings suggest a potential improvement in AF management guidelines.