Table 3.
Electrophysiological Characteristics in the 3 Patient Groups
| All | RAI | LAI | Other CCHDs | P Value | |
|---|---|---|---|---|---|
| EPS, n | 30 | 18 | 5 | 7 | |
| Twin AV node | 18 (60) | 13 (72.2) | 2 (40) | 3 (42.9) | 0.245 |
| Wenckebach cycle length, ms | 276±63 | 252±26 | 378±110 | 278±31 | 0.011 |
| SVT | 21 (70.0) | 14 (77.8) | 2 (40) | 5 (71.4) | 0.263 |
| TAVNRT | 12 (57.1) | 9 (64.3) | 1 (50) | 2 (40) | |
| Junctional tachycardia | 3 (14.3) | 2 (14.3) | 1 (50) | 0 | |
| AVRT | 6 (28.6) | 3 (21.4) | 1 (50) | 2 (40) | |
| AVNRT | 2 (9.5) | 1 (7.1) | 0 | 1 (20) | |
| Multiple mechanisms | 7 (33.3) | 5 (35.7) | 1 (50) | 1 (20) | 0.760 |
| Tachycardia cycle length, ms | 330±82 | 305±72 | 387±67 | 364±93 | 0.569 |
| Ablation (number) | 14 | 9 | 1 | 4 | |
| Ablation target | 0.168 | ||||
| Minor AV node | 10 (71.4) | 8 (88.8) | 1 (100) | 1 (25) | |
| Accessory pathway | 3 (21.4) | 1 (11.1) | 0 | 2 (50) | |
| Slow pathway (dual AV node) | 1 (7.1) | 0 | 0 | 1 (25) | |
| Success rate of ablation, % (n/n) | 85.7 (12/14) | 88.9 (8/9) | 0 (0/1) | 100 (4/4) | 0.034 |
| SVT recurrence, % (n/n) | 16.7 (2/12) | 25 (2/8) | — | 0 (0/4) | 0.515 |
Data are shown as mean±SD or number (percentage) except as noted. AV indicates atrioventricular; AVNRT, atrioventricular nodal reentrant tachycardia; AVRT, atrioventricular reentrant tachycardia; CCHD, complex congenital heart disease; EPS, electrophysiology study; LAI, left atrial isomerism; RAI, right atrial isomerism; SVT, supraventricular tachycardia; TAVNRT, twin atrioventricular nodal reentrant tachycardia.