Figure 1. Potential ablation strategies during repeat AF procedures: a) repeat pulmonary vein isolation only with confirmation of entrance and exit block from each vein; b) pulmonary vein isolation with ad-ditional linear lesions (posterior wall isolation with linear lesions connecting the superior and infe-rior pulmonary veins; mitral isthmus ablation; +/- right atrial linear lesions); c) pulmonary vein iso-lation and ablation of non-pulmonary vein triggers (i = coronary sinus; ii = LA posterior wall (and left atrial appendage, not pictured); iii = fossa ovalis/interatrial septum; iv = crista terminalis/right atrium; v = superior vena cava).