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Figure 1 Classification and Regression Tree Model

Likelihood of parasympathetic response (PR) according to pre-ablation electrogram characteristics. The total number of ablation sites (n = 1,662) is represented by the pie diagram at the top. The shaded area of each pie diagram is proportional to the number of sites in that group showing a parasympathetic response to ablation. According to this tree analysis, we defined 3 electrogram patterns: normal, low-amplitude fractionated electrogram (LAFE), and high-amplitude fractionated electrogram (HAFE).