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| Spontaneous type 1 ECG pattern |
| Male sex |
| Syncopal episodes |
| Nocturnal agonal respiration |
| Previous ventricular tachycardia/ventricular fibrillation |
| Fragmented QRS complex (i.e. increased number of deflections) |
| Prolonged QRS |
| T-wave alternans |
| Ventricular refractory period <200 ms (identified at invasive electrophysiology study) |
| Early repolarisation pattern in inferolateral leads |
