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Figure 6 The location of earliest ventricular activation as computed by noninvasive imaging of cardiac electrophysiology is indicated in red. The ablation points are denoted by grey markers, and the location of successful ablation is given by a purple marker, indicating the ventricular insertion site of the accessory pathway. A left posterolateral accessory pathway was identified in patient 2, a left anterolateral accessory pathway in patient 5, a left posterolateral accessory pathway in patient 4, and a right posteroseptal accessory pathway in patient 6. Upper panels show activation sequences during normal atrioventricular (AV) conduction ("W"), lower panels show activation sequences during adenosine-induced AV block ("A"). Head icons indicate point of view. Isochrones are plotted in 20-ms intervals.