Table 1.
Baseline Characteristics of Patients With SQTS at Admission
| Variables | N=17 |
|---|---|
| Demographics | |
| Age, median (IQR) | 42.45 (0–67) |
| Men, No. (%) | 8 (48) |
| Symptoms, No. (%) | |
| Syncope | 5 (29) |
| Palpitation | 8 (47) |
| SCD | 3 (17.6) |
| Atrial flutter | 2 (12) |
| Atrial fibrillation | 7 (41) |
| ECG data, mean±SD | |
| QTc interval, ms | 324.9±40.8 |
| Quinidine, No. (%) | |
| Yes | 6 (35) |
| ECG after quinidine, mean±SD | |
| QTc interval, ms | 409±41.63 |
| ICD implantation, No. (%) | |
| Yes | 5 (29) |
| No | 11 (65) |
| Event recorder | 1 (6) |
| Genetic screening, No. (%) | |
| Unknown mutation | 4 (24) |
| Known mutation | 13 (76) |
| CaCN2b | 6 (35) |
| CaCNA1C | 3 (17) |
| KCNH2 | 4 (23) |
| SCN5a | 1 (6) |
| Positive ajmalin test, No. (%) | 7 (41) |
ICD indicates implantable cardioverter‐defibrillator; IQR, interquartile range; QTc, corrected QT; SCD, sudden cardiac death; SQTS, short QT syndrome.