RESUMEN
The first part of this study analyzed the spatial-temporal error distribution of the Lux-type limited lead system. Quantitative new evidence is reported that the 32-lead anterior subset estimates the further 160 leads with an average amplitude error less than 38.5 microV. The spatial error distribution revealed 8 sites where the error is the highest, primarily on the anterior side, independent of the clinical classification. The second part of the study examined inter-lead-system conversion strategies for interpolating the Lux-192 lead maps from the Montreal-63 data. The methodology based on the Laplacian interpolation yielded an average amplitude error of 143.7 microV and an average correlation of 0.87 for pattern fidelity. In this specific case a modified linear interpolation surpassed the Laplacian method. A presented example illustrates that even in cases when the fidelity of the signal information is heavily compromised the diagnostic information may remain less influenced.
Asunto(s)
Mapeo del Potencial de Superficie Corporal , Bases de Datos Factuales , Humanos , Procesamiento de Señales Asistido por ComputadorRESUMEN
The main goal of the present paper is to study the temporal and spatial course of cardiac electrical activation noninvasively, and to acquire more information than can be obtained from conventional methods, such as electrocardiography or vectorcardiography. The single moving resultant heart dipole is determined from a set of measured body surface potential maps before dipolar and nondipolar theoretical body surface potential maps are calculated. These three kinds of maps are studied together in different electro-cardiological situations (normal, left and right bundle branch block, and necrosis) during the entire cardiac cycle. The set of nondipolar maps is suitable for localizing and following the changes of minor positivity and negativity to detect small extensions of infarcts.