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Figure 2 Intracardiac electrograms downloaded for cross correlation with the mapping catheter positioned in the left atrial appendage as seen in Fig. 1. On each panel from top to bottom, electrocardiographic (ECG) lead V1, the unipolar contact electrogram (Uni MDU D), and the virtual unipolar electrogram (EnGuide virtual) are shown recorded at the endocardial surface where the map catheter is positioned. The top panel is before a bolus of adenosine was given and the bottom panel during an atrioventricular block induced by adenosine. In this example, the correlation coefficient (r) between the contact and virtual electrograms is 0.72, but it deteriorates to 0.53 during the adenosine bolus. The time units are in milliseconds.
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