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Changes of AERP in the control, pacing, and pacing + SSYX groups after long-term intermittent atrial pacing. *P < 0.05 versus control group, †P < 0.01 versus control group; ‡P < 0.001 versus control group; §P < 0.05, pacing + SSYX group versus pacing group; ||P < 0.01, pacing + SSYX group versus pacing group. SSYX: Shensong Yangxin; AERP: Atrial effective refractory period.
