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2015 ; 10
(10
): e0140123
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Superiority of Classification Tree versus Cluster, Fuzzy and Discriminant Models
in a Heartbeat Classification System
#MMPMID26461492
Krasteva V
; Jekova I
; Leber R
; Schmid R
; Abächerli R
PLoS One
2015[]; 10
(10
): e0140123
PMID26461492
show ga
This study presents a 2-stage heartbeat classifier of supraventricular (SVB) and
ventricular (VB) beats. Stage 1 makes computationally-efficient classification of
SVB-beats, using simple correlation threshold criterion for finding close match
with a predominant normal (reference) beat template. The non-matched beats are
next subjected to measurement of 20 basic features, tracking the beat and
reference template morphology and RR-variability for subsequent refined
classification in SVB or VB-class by Stage 2. Four linear classifiers are
compared: cluster, fuzzy, linear discriminant analysis (LDA) and classification
tree (CT), all subjected to iterative training for selection of the optimal
feature space among extended 210-sized set, embodying interactive second-order
effects between 20 independent features. The optimization process minimizes at
equal weight the false positives in SVB-class and false negatives in VB-class.
The training with European ST-T, AHA, MIT-BIH Supraventricular Arrhythmia
databases found the best performance settings of all classification models:
Cluster (30 features), Fuzzy (72 features), LDA (142 coefficients), CT (221
decision nodes) with top-3 best scored features: normalized current RR-interval,
higher/lower frequency content ratio, beat-to-template correlation. Unbiased
test-validation with MIT-BIH Arrhythmia database rates the classifiers in
descending order of their specificity for SVB-class: CT (99.9%), LDA (99.6%),
Cluster (99.5%), Fuzzy (99.4%); sensitivity for ventricular ectopic beats as part
from VB-class (commonly reported in published beat-classification studies): CT
(96.7%), Fuzzy (94.4%), LDA (94.2%), Cluster (92.4%); positive predictivity: CT
(99.2%), Cluster (93.6%), LDA (93.0%), Fuzzy (92.4%). CT has superior accuracy by
0.3-6.8% points, with the advantage for easy model complexity configuration by
pruning the tree consisted of easy interpretable 'if-then' rules.