Fig. 1.

Inflated arctic front advance cryoballoon with spiral mapping catheter introduced through the balloon inner lumen and positioned in the PV at the closest achievable proximity to enable real-time PV potential observation. a 1st generation 8-polar spiral mapping catheter (Achieve, SMC1) with 20 mm diameter. b 2nd generation 10-polar spiral mapping catheter (Achieve Advance, SMC2) with 25 mm diameter and 10 electrodes enables more proximal electrode localization at the PV ostium. Fluoroscopic images recorded in RAO 30°. c The SMC1 was constructed with a steel jacket containing electrical wires. SMC2 was designed without a steel jacket, instead SMC2 was designed with a solid core wire and electrical wires are put around in a polyimite coating. d SMC1 and SMC2 are available as 15 mm and 20 mm diameter and 8 electrodes. SMC2 is available in addition as 25 mm diameter and with 10 electrodes