Figure 4 Activation Maps Showing Left Atrial Breakthrough during Right Atrial Pacing in a Patient without Epicardial Connection
Representative atrial activation maps demonstrating left atrial breakthrough in a patient with epicardial connection. Local latency at the anteroseptal and carina regions are shown in each map. A magenta tag indicates the pacing site in the right atrium on each map. The activation map shows a breakthrough only at the anteroseptal region. Left atrial activations were similar during right atrial appendage pacing and right atrial posterior wall pacing.
LA = left atrium; RA = right atrium; LSPV = left superior pulmonary vein; LIPV = left inferior pulmonary vein; RSPV = right superior pulmonary vein; RIPV = right inferior pulmonary vein.