Table 3.
Baseline Characteristics of Cases
| All Cases | TBA | No TBA | P Value | |
|---|---|---|---|---|
| Total cases | n=118 | n=74 | n=44 | |
| Median age, y (range) | 26.3 (1.6 to 54.9) | 26.7 (1.8 to 54.9) | 24.8 (1.6 to 47) | 0.28 |
| Median weight, kg (range) | 63 (9.4 to 165) | 63 (11 to 121) | 64.5 (9.4 to 165) | 0.8 |
| Median follow‐up, d (range) | 353 (1 to 1862) | 394 (1 to 1862) | 247 (1 to 1343) | 0.06 |
| Atrial anatomy and palliation | ||||
| Classic or modified Fontan | 52 (44%) | 24 (32%) | 28 (64%) | 0.001 |
| Lateral tunnel Fontan | 34 (29%) | 24 (32%) | 10 (23%) | 0.3 |
| Extracardiac Fontan | 3 (3%) | 2 (3%) | 1 (2%) | |
| Mustard | 16 (14%) | 13 (18%) | 3 (7%) | 0.16 |
| Senning | 13 (11%) | 11 (15%) | 2 (5%) | 0.12 |
| Arrhythmia history | ||||
| IART | 94 (80%) | 61 (82%) | 33 (74%) | 0.34 |
| Atrial fibrillation | 22 (19%) | 12 (16%) | 10 (23%) | 0.46 |
| Unclassified SVT | 22 (19%) | 10 (14%) | 12 (27%) | 0.09 |
| Other | 27 (23%) | 17 (23%) | 10 (23%) | 1 |
| Indications for EPS | ||||
| Symptoms and ECG documentation | 101 (86%) | 65 (88%) | 36 (82%) | 0.42 |
| Arrest or syncope and ECG documentation | 6 (5%) | 5 (7%) | 1 (2%) | 0.4 |
| Symptoms only | 4 (3%) | 1 (1%) | 3 (7%) | |
| Asymptomatic ECG documentation | 6 (5%) | 2 (3%) | 4 (9%) | 0.19 |
| Preexitation only | 1 (1%) | 1 (1%) | 0 (0%) | |
ECG indicates echocardiogram; EPS, electrophysiology study; IART, intra‐atrial reentry tachycardia; SVT, supraventricular tachycardia; TBA, transbaffle access.