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©2013 UpToDate ® Print Email Bipolar and unipolar electrograms The upper tracing shows a bipolar electrogram and the lower tracing shows overlapping simultaneous unipolar recordings from the two poles comprising the bipole. The solid line is from unipolar #1 and the dashed line is from the inverted tracing from unipolar #2; unipolar #2 is inverted to correspond to the recording vector it serves in the bipolar recording. In the unipolar recordings, there is a gradual upsloping and downsloping of the potential, which is generated by far-field activation. The shaded area between the two unipolar tracings represents the portion of the signal subtracted out in the bipolar recording.