Lessons from individualized cryoballoon sizing. Is there a role for the small balloon?

Area of Science:

• Cardiology
• Electrophysiology

Background:

• Cryoablation is a standard treatment for paroxysmal atrial fibrillation (PAF).
• The second-generation cryoballoon (CBG2) with a single-big-balloon strategy is commonly used for pulmonary vein isolation (PVI).
• Individualized PV anatomy may necessitate an anatomic approach using different CB sizes (23-mm or 28-mm).

Purpose of the Study:

• To evaluate the efficacy and safety of an individualized anatomic approach using 23-mm or 28-mm cryoballoon (CB) sizes for pulmonary vein isolation (PVI) in patients with paroxysmal atrial fibrillation (PAF).

Main Methods:

• A prospective, non-randomized, single-center study enrolled 197 patients with symptomatic PAF.
• Patients received either the 28-mm CB, 23-mm CB, or both sizes based on preprocedural imaging and procedural difficulty.
• The primary endpoint was arrhythmia-free survival; secondary endpoints included procedural results and complications.

Main Results:

• Acute PVI was achieved in 99.9% of pulmonary veins.
• The 28-mm CB was used as the primary catheter in 47% of patients, and the 23-mm CB in 53%.
• Both CB sizes demonstrated similar safety and effectiveness, with an 18-month success rate of 71% and a low complication rate.

Conclusions:

• Cryoballoon ablation can be challenging, but both 23-mm and 28-mm CB sizes are safe and effective for PVI.
• The 28-mm CB is generally preferred, but the 23-mm CB is a valuable option for achieving PVI in smaller veins or when the 28-mm balloon is difficult to position.
• Further research is needed to determine if the 23-mm CB could be beneficial as the primary choice in specific patient groups, such as females with smaller body height and short left atrial diameters.