TABLE 2.
AF Triggers and Substrates Between Index and Repeat Procedures
| Characteristic | All Patients (n = 29) |
FIRM+Conventional Index Case (n = 9) |
Conventional Index Case (n = 20) |
P |
|---|---|---|---|---|
| Index case | ||||
| Number of concurrent sources | 3.2 ± 1.4 | 4.4 ± 1.0 | 3.2 ± 1.4 | 0.02 |
| No. of left atrial AF sources | 2.3 ± 0.7 | 2.3 ± 0.7 | 1.9 ± 0.6 | 0.10 |
| Total left atrial sources | 63 | 24 | 39 | |
| No. of right atrial AF sources | 1.9 ± 0.6 | 2.0 ± 0.5 | 1.8 ± 0.6 | 0.49 |
| Total right atrial sources | 34 | 16 | 18 | |
| No. PV connected | 3.9 ± 0.4 | 3.9 ± 0.3 | 3.9 ± 0.4 | 0.95 |
| AF cycle length, milliseconds | 167 ± 19 | 165 ± 18 | 168 ± 19 | 0.67 |
| Ablation | ||||
| No. PV isolated | 3.9 ± 0.4 | 3.9 ± 0.3 | 3.9 ± 0.4 | 0.95 |
| Linear ablation | 26 | 7 | 19 | 0.45 |
| Roof | 24 | 7 | 17 | |
| Mitral isthmus | 1 | 0 | 1 | |
| Cavotricuspid isthmus | 9 | 0 | 9 | |
| Repeat case† | (n = 26) | (n = 8) | (n = 18) | |
| Time since index case/months | 21.4 ± 19.9 | 11.9 ± 4.8 | 25.7 ± 22.6 | 0.08 |
| No. of concurrent sources | 3.0 ± 1.2* | 2.9 ± 1.7* | 3.1 ± 1.0 | 0.73 |
| No. of left atrial AF sources | 2.0 ± 0.8* | 1.9 ± 0.9* | 1.9 ± 0.7 | 0.80 |
| Conserved versus index | 37/46 | 10/13 | 27/33 | 0.70 |
| New versus index | 9/46 | 3/13 | 6/33 | |
| No. of right atrial AF sources | 1.8 ± 0.7 | 1.7 ± 0.5 | 1.9 ± 0.7 | 0.51 |
| Conserved versus index | 24/29 | 9/10 | 15/19 | 0.63 |
| New versus index | 5/29 | 1/10 | 4/19 | |
| No. PV connected | 2.7 ± 1.7* | 3.0 ± 1.5* | 2.5 ± 1.7* | 0.46 |
| AF cycle length, milliseconds | 177 ± 21* | 180 ± 19* | 176 ± 23 | 0.62 |
Statistical analyses were done using Mann–Whitney U for unmatched groups, Wilcoxon signed rank test for matched pairs, and Fisher exact test for contingency tables.
P < 0.05 compared to initial case.
†
3/29 patients had atrial tachycardias and were non-inducible for AF.