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Figure 2 Cumulative proportion of 15 patients with atrial fibrillation (AF) after surgical left atrial appendage obliteration (LAPTONI) without thromboembolism (straight line). The reference lines are based on thromboembolism rates for non-anticoagulated AF patients aged 65 to 75 years in the Atrial Fibrillation Investigators' (AFI) meta-analysis with at least one risk factor (upper dashed line) (1) and for non-anticoagulated AF patients of any age with a history of prior thromboembolism in AFI and the European Atrial Fibrillation Trial (EAFT) (bottom dashed line) (1,2).