Table 2.
Comparison of procedural data
| Group I (bonus-freeze) |
Group II (no bonus-freeze) |
p | |
|---|---|---|---|
| Number of PVs, n | 231 | 237 | |
| Total CB cycles per PV | 2 (2, 2) | 1 (1, 1) | <0.001 |
| Total CB cycles per PV until PVI | 1 (1, 1) | 1 (1, 1) | 0.24 |
| Number of isolated PVs, n (%) | 230/231 (99) | 235/237 (99) | 0.66 |
| Minimal CB2 temperature (°C) | −51.1 ± 6 | −48.2 ± 6 | <0.001 |
| Minimal esophageal temp. (°C) | 34.6 (31, 36) | 35.3 (34, 36) | 0.05 |
| Time to PVI (s) | 40 (27, 65) | 38 (28, 55) | 0.32 |
| Procedure time (min) | 138.2 ± 29 | 113.8 ± 32 | 0.03 |
| Fluoroscopy time (min) | 24.3 ± 8 | 19.2 ± 6 | 0.02 |
| Amount of contrast medium (ml) | 160 (150, 200) | 120 (100, 140) | <0.001 |
| Phrenic nerve palsy, n (%) | 2 (3) | 3 (5) | 1.00 |
Values are expressed as mean and SD if data were normally distributed or as median (1st, 3rd quartile)
PV(s) Pulmonary vein(s), CB2 second-generation 28 mm cryoballoon, PVI pulmonary vein isolation