Ablation of typical atrial flutter using mini electrode measurements for maximum voltage-guided ablation: A...

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Novel ablation catheters with mini electrode (ME) sensing are available, but their clinical utility remains unclear.
• Cavotricuspid isthmus (CTI) ablation is a standard procedure for treating atrial flutter (AFL).

Purpose of the Study:

• To investigate if using ME signals improves the effectiveness of CTI ablation for AFL compared to standard bipolar signals.
• To evaluate procedural characteristics and outcomes when using ME signals versus conventional signals.

Main Methods:

• A randomized trial involving 61 patients with CTI-dependent AFL undergoing ablation.
• Patients were randomized to ablation using a standard 8 mm catheter with bipolar signals or an IntellaTip MiFi catheter with ME signals.
• A maximum voltage-guided approach was employed in both groups.

Main Results:

• Acute bidirectional block was achieved in 97% of patients.
• No significant differences were observed in AFL recurrence rates (17% vs. 11%), procedure duration, or fluoroscopy times between the groups.
• ME signal amplitudes were significantly larger, and ME signals were clearer in some cases where bipolar signals were difficult to interpret, but this did not translate to improved outcomes.

Conclusions:

• Ablation guided by ME signals demonstrated no significant difference in effectiveness compared to standard bipolar signals for CTI ablation in AFL.
• Despite larger signal amplitudes and improved clarity in certain situations, ME signals did not enhance procedural efficiency or patient outcomes.
• Future research should prioritize evaluating lesion integrity over signal sensing characteristics in CTI ablation procedures.