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The authors previously (1983) studied the spread of excitation on the ventricular surface of exposed dog hearts during normal sinus rhythm. They observed 15-24 breakthrough (BKT) sites on the anterior right and left ventricular surface and 15 sites on average on the postero-inferior surface. The authors hypothesized that the location of the epicardial BKT sites might be related to the location of...
The authors introduce a normalized Karhunen-Loeve (K-L) expansion in the spatial data reduction of BSPM (body surface potential map) data. In the normalized K-L expansion, the covariance matrix is calculated by the normalized vectors (maps), and the purpose of the normalization is to eliminate the energy inhomogeneity. The results show the superior performance of the normalized K-L expansion over...
Body surface potential mapping (BSPM) techniques have improved diagnosis of ischemia patients with normal resting ECG. The authors report BSPM data from 32 normal and 24 ischemia patients (all adults). The studies included: (1) separability of normal and ischemia from QRS integral maps (represented by normalized K-L expansion) by a two-layer forward network method; (2) evaluation of classification...
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