Ryan, Maki, Mann & Hohenfeldt
Systems and methods for acquiring endocardially or epicardially paced electrocardiograms
 Systems and methods acquire electrocardiograms using a first electrode associated with a region of heart tissue and a second body surface electrode. An analog or digital processing element is coupled to the first and second electrodes for conditioning the first electrode to emit a pacing signal and for conditioning the second electrode to sense paced electrocardiograms occurring as a result of the pacing signal. The systems and methods also employ a template of an electrocardiogram of a cardiac event of known diagnosis; for example an arrhythmia that the physician seeks to treat. This event-specific template comprises a plot of biopotentials over time and not a spacial distribution of endocardial surface activation. The systems and methods compare this event-specific template to a sample of a paced electrocardiogram. The paced electrocardiogram sample comprises a plot of biopotentials over time and not a spacial distribution of endocardial surface activation. The comparison yields a matching coefficient indicating how alike the input sample is to the input template. The matching coefficient can be used by the physician, for example, to aid in the location of sites that are potentially appropriate for ablation. 
EP Technologies, Inc.
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Dorin James G. David K.
Panescu Whayne Swanson