Table 1: Schwartz score LQTS diagnostic criteria and their values in athletes.
| Schwartz Score | Points | Questionable in Athletes | |
|---|---|---|---|
| Electrocardiographic findings | |||
| A | QTc duration (ms) (Bazett formula) | ||
| ≥480 | 3 | ||
| 460–470 | 2 | x | |
| 450 (in males) | 1 | x | |
| B | Torsades de pointes* | 2 | |
| C | T-wave alternans | 1 | |
| D | Notched T wave in three leads | 1 | |
| E | Low heart rate for age | 0.5 | x |
| Clinical history | |||
| A | Syncope* | ||
| With stress | 2 | ||
| Without stress | 1 | ||
| B | Congenital deafness | 0.5 | |
| Family history | |||
| A | Family members with definite LQTS | 1 | |
| B | Unexplained sudden cardiac death below the age of 30 among immediate family members | 0.5 | |
* Mutually exclusive. Source: Schwartz PJ, et al.[22] With permission from Wolters Kluver.