HYBRID BIPOLAR/UNIPOLAR DETECTION OF ACTIVATION WAVEFRONT

摘要

A bipolar electrogram and a unipolar electrogram are recorded from electrodes of a probe, and differentiated with respect to time. Peaks are identified in the differentiated bipolar electrogram. An activity window is defined that includes bipolar activity about the peaks. An extreme negative value in the differentiated unipolar electrogram within the activity window is reported as a unipolar activation onset. In one aspect, an annotation is selected from candidate minima in the differentiated unipolar electrogram within the activity window by excluding candidates that fail to correlate with activity in the bipolar electrogram.

主权项

1. A method, comprising the steps of:
inserting a probe into a heart of a living subject, the probe having electrodes; recording a bipolar electrogram and a unipolar electrogram from a location in the heart with the electrodes; defining a time interval comprising a window-of-interest; differentiating the bipolar electrogram and the unipolar electrogram with respect to time to define a differentiated bipolar electrogram and a differentiated unipolar electrogram, respectively; identifying peaks within the window-of-interest in the differentiated bipolar electrogram; establishing a bipolar activity window about respective peaks, the bipolar activity window having activity bounds that include activity about the peaks in the bipolar electrogram; and identifying an extreme negative value (−dV/dt) in the differentiated unipolar electrogram within the activity bounds, and reporting a time corresponding to the value as a unipolar activation onset.