Table 4. Cryoablation characteristics.
Data presented as N (%) or mean ± SD. LSPV, left superior pulmonary vein; LIPV, left inferior pulmonary vein; RSPV, right superior pulmonary vein; RIPV, right inferior pulmonary vein
| Polarx™ (N, 30) | Arctic Front™ (N, 30) | P value | |
|---|---|---|---|
| LSPV | |||
| Number of occlusion | 1.17 ± 0.46 | 1.07 ± 0.25 | 0.3 |
| Cumulative freeze duration | 225.13 ± 112.86 | 214.0 ± 78.28 | 0.65 |
| Time to 0ºC, seconds | 15.0 ± 1.53 | 11.93 ± 1.68 | < 0.001 |
| Time to -40ºC, seconds | 30.7 ± 4.35 | 44.17 ± 10.71 | < 0.001 |
| Temperature at 60 secs, ºC | -52.33 ± 4.17 | -45.0 ± 4.25 | < 0.001 |
| Nadir temperature, ºC | -57.7 ± 5.42 | -52.8 ± 4.57 | < 0.001 |
| Real time isolation | 27 (90%) | 22 (73%) | 0.09 |
| Isolation time, seconds | 43.81 ± 19.30 | 48.43 ± 39.98 | 0.6 |
| Isolation temperature, ºC | -44.3 ± 10.6 | -35.50 ± 12.59 | 0.01 |
| Thaw time to 0ºC, seconds | 19.34 ± 6.92 | 11.50 ± 4.01 | < 0.001 |
| LIPV | |||
| Number of occlusion | 1.0 ± 0 | 1.27 ± 0.64 | 0.02 |
| Cumulative freeze duration | 180.43 ± 19.76 | 249.07 ± 91.78 | < 0.001 |
| Time to 0ºC, seconds | 13.27 ± 2.28 | 10.47 ± 1.54 | < 0.001 |
| Time to -40ºC, seconds | 33.30 ± 14.0 | 54.93 ± 22.37 | < 0.001 |
| Temperature at 60 secs, ºC | -49.90 ± 5.24 | -41.0 ± 4.22 | < 0.001 |
| Nadir temperature, ºC | -55.33 ± 5.96 | -45.37 ± 6.86 | < 0.001 |
| Real time isolation | 25 (83%) | 18 (60%) | 0.04 |
| Isolation time, seconds | 26.24 ± 9.65 | 26.11 ± 18.56 | 0.9 |
| Isolation temperature, ºC | -29.52 ± 11.83 | -25.28 ± 11.17 | 0.2 |
| Thaw time to 0ºC, seconds | 17.71 ± 5.99 | 8.63 ± 3.8 | < 0.001 |
| RSPV | |||
| Number of occlusion | 1.13 ± 0.34 | 1.23 ± 0.62 | 0.4 |
| Cumulative freeze duration | 205.9 ± 71.31 | 214.27 ± 78.5 | 0.6 |
| Time to 0ºC, seconds | 13.4 ± 2.41 | 10.07 ± 1.31 | < 0.001 |
| Time to -40ºC, seconds | 30.53 ± 13.7 | 43.74 ± 15.0 | 0.001 |
| Temperature at 60 secs, ºC | -52.47 ± 5.72 | -43.83 ± 4.52 | < 0.001 |
| Nadir temperature, ºC | -59.67 ± 6.83 | -51.77 ± 5.66 | < 0.001 |
| Real time isolation | 24 (80%) | 24 (80%) | 1.0 |
| Isolation time, seconds | 32.83 ± 28.64 | 24.96 ± 13.97 | 0.2 |
| Isolation temperature, ºC | -31.71 ± 12.07 | -26.75 ± 10.65 | 0.1 |
| Thaw time to 0ºC, seconds | 20.81 ± 10.36 | 10.36 ± 4.76 | < 0.001 |
| RIPV | |||
| Number of occlusion | 1.07 ± 0.25 | 1.20 ± 0.4 | 0.1 |
| Cumulative freeze duration | 202.07 ± 45.13 | 222.27 ± 65.38 | 0.1 |
| Time to 0ºC, seconds | 13.37 ± 1.69 | 10.33 ± 1.51 | < 0.001 |
| Time to -40ºC, seconds | 27.2 ± 14.91 | 49.28 ±16.0 | < 0.001 |
| Temperature at 60 secs, ºC | -52.0 ± 4.92 | -41.57 ± 3.62 | < 0.001 |
| Nadir temperature, ºC | -58.83 ± 6.17 | -48.60 ± 4.73 | < 0.001 |
| Real time isolation | 25 (83%) | 20 (66%) | 0.1 |
| Isolation time, seconds | 34.16 ± 20.58 | 36.95 ± 20.38 | 0.6 |
| Isolation temperature, ºC | -35.64 ± 14.21 | -30.35 ± 7.88 | 0.1 |
| Thaw time to 0ºC, seconds | 19.41 ± 7.93 | 9.52 ± 3.52 | < 0.001 |
| Total | |||
| Number of occlusion | 1.09 ± 0.3 | 1.19 ± 0.5 | 0.6 |
| Cumulative freeze duration | 203.38 ± 72.03 | 224.9 ± 79.35 | 0.02 |
| Time to 0ºC, seconds | 13.76 ± 2.11 | 10.69 ± 1.66 | < 0.001 |
| Time to -40ºC, seconds | 30.43 ± 12.53 | 47.96 ± 16.91 | < 0.001 |
| Temperature at 60 secs, ºC | -51.67 ± 5.09 | -42.87 ± 4.41 | < 0.001 |
| Nadir temperature, ºC | -58.13 ± 6.26 | -49.63 ± 6.19 | < 0.001 |
| Real time isolation | 101 (84%) | 84 (70%) | 0.009 |
| Isolation time, seconds | 34.47 ± 21.23 | 34.18 ± 26.79 | 0.9 |
| Isolation temperature, ºC | -35.5 ± 13.36 | -29.58 ± 11.27 | 0.002 |
| Thaw time to 0ºC, seconds | 19.31 ± 7.9 | 10.0 ± 4.13 | < 0.001 |