Table 1.
Baseline Characteristics by Cardiac Event Trigger Type
| Characteristics | Acute Arousal (n=90) | Exercise (n=24) | Non-Arousal/Non-Exercise (n=90) | No Event (n=430) | P Value |
|---|---|---|---|---|---|
| Gender | |||||
| Female, % | 82 | 58 | 67 | 44 | <0.001 |
| ECG at enrollment | |||||
| QTc, ms | 502 ± 52 | 513 ± 58 | 505 ± 64 | 467 ± 45 | <0.001 |
| RR, ms | 934 ± 236 | 970 ± 184 | 877 ± 210 | 787 ± 244 | <0.001 |
| QRS, ms | 80 ± 14 | 82 ± 12 | 81 ± 18 | 81 ± 17 | 0.93 |
| LQTS-therapies | |||||
| β-blockers, % | 81 | 75 | 76 | 42 | <0.001 |
| LCSD, % | 7.8 | 0 | 3 | 0 | <0.001 |
| Pacemaker, % | 26 | 8 | 14 | 1 | <0.001 |
| ICD, % | 39 | 25 | 33 | 4 | <0.001 |
| Type of cardiac event | |||||
| Syncope, % | 93 | 94 | 91 | NA | 0.33 |
| ACA, % | 4 | 2 | 5 | NA | 0.12 |
| Shock, % | 1 | 1 | 0 | NA | 0.84 |
| SCD % | 2 | 3 | 4 | NA | 0.83 |
| Recurrent cardiac events* | |||||
| Subsequent events of the same type, % | 84 | 71 | 54 | NA | <0.001 |
| Subsequent events of a different type, % | 13 | 12 | 17 | NA | 0.82 |
ACA = aborted cardiac arrest; ICD = implantable cardioverter defibrillator; LCSD = left cardiac sympathetic denervation; LQTS = long-QT syndrome.
*
Denotes the proportion of patient who experienced a subsequent cardiac event at any time during follow-up that had the same/different type of trigger as the first cardiac event.