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Figure 6 Electrograms from the decapolar catheters that were placed in the left atrium (LA) and the right atrium (RA). Biatrial rapid burst pacing for 2 s resulted in the termination of atrial fibrillation. During the pacing, both atria are captured. The channels labeled RA3 and LA3 were selected for pacing (pacing artifact during the pacing train is not uniformly displayed in the RA3 and LA3 channels because of limitations of the physiologic recorder software).