Assessing common classification methods for the identification of abnormal repolarization using indicators of T-wave morphology and QT interval.
Various parameters based on QTc and T-wave morphology have been shown to be useful discriminators for drug induced I(Kr)-blocking. Using different classification methods this study compares the potential of these two features for identifying abnormal repolarization on the ECG. A group of healthy volunteers and LQT2 carriers were used to train classification algorithms using measures of T-wave morphology and QTc. The ability to correctly classify a third group of test subjects before and after receiving d,l-sotalol was evaluated using classification rules derived from training. As a single electrocardiographic feature, T-wave morphology separates normal from abnormal repolarization better than QTc. It is further indicated that nonlinear boundaries can provide stronger classifiers than a linear boundaries. Whether this is true in general with other ECG markers and other data sets is uncertain because the approach has not been tested in this setting.
Center for Sensory Motor Interaction, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark. saeedsh@hst.aau.dk
Saeed
S
Shakibfar
Claus
C
Graff
Lars H
LH
Ehlers
Egon
E
Toft
Jørgen K
JK
Kanters
Johannes J
JJ
Struijk
D000328:Adult; D000465:Algorithms; D016000:Cluster Analysis; D016002:Discriminant Analysis; D004562:Electrocardiography / Q000145:classification* / Q000379:methods*; D005260:Female; D017143:Fuzzy Logic; D006801:Humans; D008133:Long QT Syndrome / Q000503:physiopathology; D008297:Male; D015999:Multivariate Analysis; D012372:ROC Curve; D012815:Signal Processing, Computer-Assisted