Single beat detection of ventricular late potentials at the body surface

A system to detect a very small ventricular late potential in a noninvasive manner was developed. It does not utilize signal (time) averaging, so that it records single-beat activity continuously. Instead of signal averaging, modified spatial averaging with multiple electrodes was applied. The potential was calculated by the finite-element method with a special electrical node arrangement. The results revealed that the duration of the late potential altered in every cardiac cycle. This results in the attenuation of high-frequency components of time-averaged waveforms and degrades conventionally obtained late potentials.<>