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Figure 2 The two-year cumulative event-free survival rate in patients with no changes in standard deviation of the averages of intrinsic intervals in the 288 five-minute segments of a day (SDANN) four weeks after implantation (first tertile,  change  0%), in patients with some SDANN changes (second tertile, change from 0 to 17%), and in those with large SDANN changes (third tertile, change  17%). CRT = cardiac resynchronization therapy; CV hospitalization = hospitalizations for cardiovascular reasons.
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