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Flow chart of patients diagnosed with SSS who accepted pacing therapy in our study. 1 Reasons for exclusion: pacemaker replacements (n = 8), single chamber pacemaker implantations (n = 8) 2 ; Reasons for exclusion: intrinsic QRS > 120 ms, or were accordant with our exclusive criterions, or the patients refused to take part in the study (n = 42). LBBP, left bundle branch pacing; RVSP, right ventricular septum pacing; SSS, sick sinus syndrome
