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Figure 2 Kaplan-Meier Curve Showing the Outcomes of Pulmonary Vein Cryoisolation

After a mean follow-up of 33 ± 15 months, pulmonary vein cryoisolation was effective in 82% of patients. An event was considered a patient who, at any time, reported <50% improvement. The table shows the number of events compared with patients at risk over time. AF = atrial fibrillation.