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Figure 3 Organization of the electrical activity before and after lesion creation. In many cases as linear lesions were created the local atrial electrical activity progressively organized to the point of conversion to normal sinus rhythm (shown on panel D during lesion creation in position 2). Panel B depicts the marked reduction in the local electrical activity amplitude as a result of the lesion created in position 1 when compared with the preablation recordings shown in panel A (all the recordings are bipolar: 1 and 2, 3 and 4, etc.). HRA = high right atrium; CS = coronary sinus; 1 to 24 = ring electrodes.
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