Schwartz Score for Long QT Syndrome (LQTS)*
CRITERIA | POINTS |
|---|---|
Patient History | |
Syncope with stress† | 2 |
Syncope without stress† | 1 |
Congenital deafness | 0.5 |
Family History | |
Family member with known LQTS‡ | 1 |
Family member with unexplained cardiac death before age 30 ‡ | 0.5 |
Electrocardiography§ | |
QTc ≥ 480 msec | 3 |
QTc 460-479 msec | 2 |
QTc 450-459 msec (males only) | 1 |
QTc ≥ 480 msec during 4th minute of recovery from an exercise test | 1 |
Torsades de pointe arrhythmia§ | 2 |
T wave alternans | 1 |
Notched T wave in 3 leads | 1 |
Resting heart rate < 2nd percentile for age | 0.5 |
* SCORE: ≤ 1 low probability; 1.5–3 intermediate probability; ≥ 3.5 high probability | |
† Mutually exclusive (ie, if syncope occurs with stress, no points are given for syncope without stress) | |
‡ Mutually exclusive | |
§ If torsades de pointe present, do not score syncope | |
Data from Schwartz PJ, Crotti L: QTc behavior during exercise and genetic testing for the long-QT syndrome. Circulation 124:2181–2184, 2011. doi: 10.1161/CIRCULATIONAHA.111.062182 | |