QTc in milliseconds | |
<370 | 1 |
<350 | 2 |
<330 | 3 |
J point-T peak interval | |
<120 | 1 |
Clinical History | |
Sudden cardiac arrest | 2 |
Polymorphic VT or VF | 2 |
Unexplained syncope | 1 |
Atrial fibrillation | 1 |
Family History | |
1s or 2nd degree relative to SQTS | 2 |
1st or 2nd degree relative to sudden death | 1 |
Sudden infant death syndrome | 1 |
Genotype | |
Genotype positive | 2 |
Mutation of undetermined significance in a culprit gene | 1 |