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Figure 7 Propagation map of the coronary sinus (CS) and left atrium during tachycardia. The upper panel shows the anteroposterior (AP) view followed by the posteroanterior (PA) view in the lower panel. This map clearly shows the earliest activation in the distal CS followed by activation of the rest of the CS musculature and finally spread of activation to the left atrium. This suggests focal origin of the tachycardia from the CS musculature.
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