Why the study?
There is limited evidence available regarding the treatment of atrial fibrillation using the new POLARx FIT cryoballoon, expandable from 28 to 31 mm in diameter.
Does the 31 mm mode of an expandable cryoballoon improve pulmonary vein occlusion compared to the 28 mm mode in patients with atrial fibrillation and large pulmonary veins?
Does the 31 mm mode of an expandable cryoballoon improve pulmonary vein occlusion compared to the 28 mm mode in patients with atrial fibrillation and large pulmonary veins?
The use of a 31 mm expandable cryoballoon provides effective pulmonary vein occlusion and isolation in patients with large left atria and complex pulmonary vein geometries.
May facilitate occlusion in select large-vein AF cases; hypothesis-generating pending controlled trials.
Background: It is established that pulmonary vein isolation using the POLARx™ (Boston Scientific, Marlborough, MA, USA) cryoballoon is a rapid, safe, and effective approach. The new POLARx™ FIT (Boston Scientific), which is expandable from 28 to 31 mm in diameter, is currently available. However, there is limited evidence available regarding the treatment of atrial fibrillation in this setting. In this article, we report a case series of cryoballoon ablation in patients with atrial fibrillation using POLARx™ FIT. Case summary: This case series describes a comparison of obstruction in three patients with pulmonary veins of different shapes and diameters undergoing cryoballoon ablation and pulmonary vein isolation with a 31 mm diameter balloon. Discussion: Cryoballoon ablation using the 31 mm mode of POLARx™ FIT has the potential to provide safe and stable pulmonary vein isolation with good occlusion for a variety of pulmonary vein geometries. In this case series, the 31 mm mode of the POLARx™ FIT resulted in better pulmonary vein occlusion than the 28 mm mode in patients with large left atria and large pulmonary veins, including the left common pulmonary vein. This approach may be considered a first-line therapy option of cryoballoon ablation in patients with atrial fibrillation.
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Yoshizawa et al. (2023) studied this question.
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