Table 1: Diagnostic criteria for LQTS.

ECG findings cQT  ≥480 msec 3 points  460–470 msec 2 points  450 msec (in males) 1 points Torsade de pointes 2 points T-wave alternans 1 points Notched T wave in 3 derivation 1 points Low heart rate for age 0.5 points Clinical history Syncope  With stress 2 points  Without stress 1 points Congenital deafness 0.5 points Family history Siblings with LQTS 1 points History of sudden death before 30 years of age 0.5 points