Table 2. Procedural characteristics and follow-up.

Pulmonary veins isolation (PVI). Mean ±SD, numbers (%), median [25-75 percentiles].

Procedural characteristics and follow-up	Abbott Safire N=37	Boston Scientific MiFi N=13	P value
Ablation:
Number of RF-applications	6 [3.5-10]	8 [2.5-14]	0.838
Average duration per application (sec)	70.2 ±33.7	60.5 ±22.6	0.343
Average temperature (Celsius)	49.5 ±1.9	52.53 ±3.5	0.059
Average impedance (ohm)	74.5 ±5.6	74.2 ±6.1	0.912
Average power (Watts)	46.4 ±11.6	45.24 ±12.9	0.365
Total ablation time (sec)	456 [263-661.8]	364 [181-821]	0.550
Procedure:
Concomitant PVI	0	1 (7.7)	0.260
Cross-over	0 (0)	0 (0)	-
Steerable sheath	2 (5.4)	2 (15.4)	0.275
Time to bi-directional block (min)	23 [12.5-37.5]	16 [3-23]	0.217
Fluoroscopic time (min)	13 [8-17]	18 [7-22]	0.631
Procedure time (min)	65 [53-80.5]	50 [34.75-73.25]	0.133
Follow-up:
Recurrence of atrial flutter at one-year	0 (0)	0(0)
Recurrence of symptoms	13 (35.1)	4 (30.8)	0.774
Occurrence of other atrial arrhythmia	14 (37.8)	5 (38.5)	0.960