High resolution QRS alignment and late potentials analysis

Late potentials (LP) analysis needs an improvement of the alignment procedure for the signal averaging and a knowledge of the noise effects on the clinical responses. To extract a better fiducial synchronizing mark, the authors propose the use of an optimal bandpass filter and high-resolution alignment techniques. The effects of the main sources of error either in the time or frequency domain of LP analysis were investigated on a database of 16 electrocardiogram recordings. Different sources and levels of noises were considered, and their influence on the two LP detection methods was studied