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A preliminary investigation of the probabilistic approach to the 12-lead exercise ECG diagnosing
Cigale, Boris ; Zazula, Damjan ; Kozmann, György
The following paper, we are discussing a correlation between the two-parameter combinations of J point, ST slope and ST integral, automatically measured in a standard 12-lead ECG system, and the ...clinical diagnosis provided by other independent means. We tested 90 patients from the database of the KFKI Institute from Budapest and calculated diagnostically relevant parameters, using the algorithms of the CardioA package developed in the System Software Laboratory at the University of Maribor, Slovenia. The classification was done in three parametric planes: J point/ST slope, J point/ST integral and ST integral/ST slope. The planes were segmented according to the maximum sensitivity for helathy persons, giving the probabilities of a patient's condition. These probabilities averaged through all 12 leads were taken as diagnostic indexed. The correct recognition rate was 91% for the CAD and 86% for healthy subjects during the rest, and 77% for the CAD and 91% for healthy subjects at submaximum exercise load. We used our probabilistic approach to measure sensitivities for different CADs referring to the individual leads, too. The ST integral/ST slope plane was found the most sensitive for AL MI in V1, for PB MI in V3, V4, and V5, and for P MI in V4, all measured at rest. However, the highest sensitivity at submaximum exercise appeared in the J point/ST integral plane in V2, V3, and II for PB MI, and I for P MI.
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