Randomized Trial of Concomitant Maze Procedure Using Nitrous Oxide- Versus Argon-Based Cryoablation

Area of Science:

• Cardiology
• Surgical Innovation
• Medical Device Technology

Background:

• Two cryoprobe types, nitrous oxide (N₂O) and argon gas, are used for atrial fibrillation (AF) ablation.
• Limited comparative data exists on the clinical outcomes of these cryoprobe technologies.

Purpose of the Study:

• To compare the early outcomes of concomitant maze procedures using N₂O-based versus argon gas-based cryoablation.
• To evaluate the efficacy and safety of N₂O and argon cryoablation in patients with persistent AF.

Main Methods:

• A prospective, randomized controlled trial involving 60 patients with persistent AF.
• Patients were randomized to N₂O cryoablation (n=30) or argon cryoablation (n=30).
• Follow-up included ECG, 24-hour Holter monitoring, and echocardiography at 3, 6, and 12 months.

Main Results:

• No significant differences in preoperative variables, morbidity, or mortality between groups.
• Similar 1-year sinus rhythm maintenance rates (86.7% for both N₂O and argon groups).
• N₂O group demonstrated earlier recovery of left atrial activity, though this difference was not sustained at 6 months.

Conclusions:

• Both N₂O and argon cryoablation are effective for achieving 1-year sinus rhythm maintenance in persistent AF.
• N₂O cryoablation may offer a benefit of earlier left atrial function recovery post-procedure.