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Figure 3 The locations of unstable reentrant circuits are shown. The unstable reentrant circuits were observed 1) involving the septum and the atrial epicardium via BB (56%) and not via BB (6%), and 2) in the right atrial free wall (21%), and were sometimes observed 3) around the pulmonary veins (7%), 4) the inferior vena cava (5%), and 5) the superior vena cava (5%). Three (#1, 3, 5; in total; 68%) of these five location reentrant circuits involved the BB (denoted by black lines). See text for discussion.
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