Contouring of epicardial activation using spatial autocorrelation estimates

The authors examine the procedure involved in producing contour maps of epicardial activation. The key step is to generate a mathematical model of activation. Spectral analysis of heart surface activation reveals a low frequency trend, representing uniform conduction, with disordered conduction concentrated in higher frequency bands. A method of mapping which uses the spatial autocorrelation function to assist in generating the epicardial activation model was compared with traditional, wholly empirical methods. Use of spatial autocorrelation appears to improve the resolution of map generation