Within subject analysis examining the effect of propagation distance (covariate), transmural recording depth (treatment), and pacing depth (treatment) on minimally filtered unipolar electrogram parameters measured.

Probabilities for the interaction term Depth*Distance represents whether there was a significant effect of propagation distance on electrogram amplitude recorded at each intra-myocardial depth level. Probabilities for the interaction term Depth*Pacing Depth indicate whether pacing depth had a significant effect on electrogram amplitude recorded at different intra-myocardial depth levels. Mean ± SD where indicated. Within subject analysis examining the effect of propagation distance (covariate), transmural recording depth (treatment), and pacing depth (treatment) on minimally filtered unipolar electrogram parameters measured.