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Figure 2 Example of unipolar and bipolar recordings used for measurement of intervals during AF. A unipolar atrial electrogram (Eg) and a bipolar atrial electrogram adjacent to the stimulation electrode are shown with intermittent introduction of single stimuli during AF at a predetermined coupling interval (CI) after the index local activation (F0). The bipolar atrial electrogram was used for sensing, and a unipolar atrial electrogram was used for measuring F0F1. (Top) At a CI of 80 ms, the F0F1 measured on two occasions were 70 and 75 ms, which were shorter than CI, suggesting that the atrium was not captured. (Middle) At a CI of 65 ms, the F0F1 were 65 and 65 ms, which were equal to CI, suggesting a possible atrial capture. (Bottom) At a CI of 60 ms, the F0F1 were 80 and 78 ms, which were longer than CI, indicating that the atrium was not captured.
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