Arrhythmia

Long QT syndromes

Normal QTc is 300-440 (men) or 300-450 (women).

Feature Score Feature Score Interpretation Score
ECG findings   Clinical history      
QTc   Syncope      
    > 480ms 3     With stress 2 High probability >3
    460-470ms 2     Without stress 1 Intermediate probability 2-3
    450ms (men) 2 Congenital deafness 0.5 Low probability 0-1
Torsades de pointes 2 Family history      
T-wave alternans 1 Definite LQTS 1    
Notched T wave in three leads 1 Unexplained sudden cardiac death age <30 years 0.5    
Low heart rate for age 0.5        
Brugada syndrome ECGs

Brugada syndrome