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Figure 1 Kaplan-Meier survival curves of patients in normal sinus rhythm versus atrial fibrillation after PMV. Numbers at the bottom represent patients alive and 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. AF = atrial fibrillation; NSR = normal sinus rhythm; PMV = percutaneous balloon mitral valvuloplasty.