Fig. 4.

Example of conduction velocity maps calculated using triangulation of electroanatomic mapping data obtained during sinus rhythm. Data are interpolated up to a maximum distance of 5 mm. (A) Map of conduction speed. Regions of rapid conduction are shown in blue, while regions of slow conduction are shown in white. Circles denote locations of electrogram recordings. (B) Conduction velocity vectors, overlaid on a map of local activation. Earliest activation is shown in red, through to latest activation shown in blue. (For interpretation of the references to color in this figure caption, the reader is referred to the web version of this article.)