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Assessment of LV dyssynchrony at baseline, 48 h after implantation, and at 6-month follow-up in patients without baseline LV dyssynchrony. At baseline, all patients showed LV dyssynchrony <60 ms [22 ms (inter-quartile range: 16–34 ms)]. At 48 h after cardiac resynchronization therapy implantation, LV dyssynchrony increased to 40 ms (inter-quartile range: 24–56 ms) and at 6-month follow-up remained unchanged [40 ms (inter-quartile range: 24–67 ms)] (P< 0.001).
