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Figure 2 Kaplan-Meier event-free survival curves of patients in NSR versus AF after PMV. Numbers at the bottom represent patients alive and free of combined events (mitral valve surgery and redo-PMV) uncensored at the end of each of period of observation for 343 patients in NSR (top) and 329 patients in AF (bottom) entered at the outset of the study. Abbreviations as in Figure 1.