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Cryoablation System

Clinical evidence

Numerous studies have demonstrated the safety and efficacy of the POLARx™ Cryoablation System in the treatment of paroxysmal atrial fibrillation. It has been studied and is in use in multiple countries across the globe.


FROzEN-AF US IDE Clinical Trial

In a global, prospective, single-arm study, researchers evaluated the safety and effectiveness of the POLARx™ Cryoablation System for treatment of symptomatic, drug refractory, recurrent, paroxysmal atrial fibrillation (PAF). At 12 months, data revealed a 96.0% freedom from primary safety events (100% for the POLARx™ FIT 6-month extension arm study) and a 79.9% freedom from atrial arrhythmias (88% in the FIT extension study). The findings also point to an increase in Grade 4 occlusions and in successful single-shot therapy with POLARx FIT at 31 mm cryoballoon expansion.1
Clinical evidence chart
Mean ± SD
*Only ablations with duration >60S included in ablation counts
Six-month data on POLARx™ FIT showed low arrhythmia recurrence and freedom from primary safety events, with a high rate of Grade 3 or 4 occlusions achieved.1

Freedom from atrial arrhythmias

at follow-up (6 months) after using POLARx FIT

Major adverse events

including esophageal fistulas, persistent phrenic nerve palsy and PV stenosis

High-grade occlusion rate

resulting in either Grade 3 or Grade 4 occlusion level

Frozen AF clinical trial

download the clinical compendium


POLAR ICE multicenter study

In a prospective, nonrandomized study conducted from 2020–2023 in multiple experienced European centers, researchers using the POLARx™ Cryoablation System for pulmonary vein isolation found the device to be effective, safe and efficient.2,3
POLAR ICE study - safety chart
Procedural characteristics3
POLAR ICE study - Procedural characteristics chart
12- month efficacy2
POLAR ICE study - Efficacy chart
Performance and biophysical characteristics3
POLAR ICE study - Performance and biophysical characteristics chart
POLAR ICE multicenter study


ANTARCTICA observational study

In a multicenter prospective assessment of the POLARx™ system's efficacy and safety for PVI in an early-adopter setting of acute efficacy and safety, researchers found that use of POLARx™ resulted in a high rate of real-time pulmonary vein isolation (PVI) visualization and durable lesion creation. Following a short 25-patient learning curve, experienced operators also incurred significantly fewer adverse safety events.4

Acute PV isolation

Real-time PVI visualization

Freedom from recurrence

at 226 ± 115 days

ANTARTICA observational study


Performance vs. existing cyroablation systems

In a propensity score-matched comparison (covarying in age, gender, CHA2DS2VASc and left atrial dilation) between POLARx™ and Arctic Front Advance™ Pro, POLARx™ demonstrated significantly lower procedure time and greater visualization of time-to-isolation.5

Faster procedure time

vs. Arctic Front Advance
(61 min. vs 73 min.)

Faster to -40˚C

vs. Arctic Front Advance
(30 min. vs 48 min.)

Greater real-time isolation rate

vs. Arctic Front Advance
(70% vs 84%)

Procedural characteristics

Polarx vs. Arctic Front - Procedural characteristics
Mojica comparison study

Studies comparing POLARx™ and other cryoablation systems

Doctor looking at a laptop screen



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1. Ellenbogen, et al. One-year outcomes of pulmonary vein isolation with a novel cryoballoon in 325 patients: primary results of the FROzEN-AF trial. Presented at: Heart Rhythm Society 2023; May 19-21, 2023; New Orleans, LA, USA.
2. Luik A, Anic A, Asmundis C, et al. Long-term success rates of a stable, low pressure cryoballoon for the treatment of paroxysmal atrial fibrillation: Results of the prospective, international, multicenter POLAR-ICE Study. Presented at: 2023 ESC Congress, Aug. 25-28, 2023; Amsterdam, Netherlands.
3. Martin CA, Tilz RRR, Anic A, et al. Acute procedural efficacy and safety of a novel cryoballoon for the treatment of paroxysmal atrial fibrillation: Results from the POLAR ICE study. J Cardiovasc Electrophysiol. 2023 Apr;34(4):833-840. doi: 10.1111/jce.15861. Epub 2023 Feb 23. PMID: 36786515.
4. Heeger CH, Pott A, Sohns C, et al. Novel cryoballoon ablation system for pulmonary vein isolation: multicenter assessment of efficacy and safety-ANTARCTICA study. Europace. 2022 Dec 9;24(12):1917-25 5.
5. Mojica J, Lipartiti F, Al Housari M, et al. Procedural safety and efficacy for pulmonary vein isolation with the novel POLARx™ Cryoablation System: A propensity score matched comparison with the Arctic Front™ Cryoballoon in the setting of paroxysmal atrial fibrillation. J Atr Fibrillation. 2021 Jun 30;14(1):20200455.

† Updated analysis with corrected data.