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. 2020 Aug 17;6(11):836–840. doi: 10.1016/j.hrcr.2020.08.005

Figure 3.

Figure 3

A: The distance from the left atrium (LA) breakthrough site to the persistent left superior vena cava (PLSVC) breakthrough site. LAA = left atrial appendage. B, C: The charts for the extrastimulus pacing assessment showing the results for each breakthrough point. Asterisks, circles, and triangles indicate basic cycle length (BCL) of 700 ms, 600 ms, and 400 ms, respectively. The horizontal line depicts the shortened pacing interval. The vertical line in panel B illustrates the conduction time from the pacing site to local potential at the left superior pulmonary vein (LSPV) ridge; the vertical line in panel C shows the conduction time from the pacing site to the local potential at the PLSVC. D, E: Internal electrocardiogram showing decremental conduction properties.