Fig 2.

Left: Mesh of a multi-electrode sock allowing recording from 240 cardiac sites. The nodes of the mesh represent the electrodes and colors the AT. Right: Unfiltered unipolar electrograms during ventricular apical pacing. Symbols mark the position of the electrodes where signals were recorded. Signals exhibited the typical morphology associated with early (QS complex and positive T-wave), mid (RS complex and positive/biphasic T-wave), and late (R monomorphic wave and biphasic/negative T-wave) activation during ventricular pacing.