Dynamic Changes in Electrogram Morphology at Functional Lines of Block in Reentrant Circuits During Ventricular Tachycardia in the Infarcted Canine Heart

Localization of Reentrant Circuits Using ATM. Introduction: Fractionated, low‐amplitude or long‐duration electrograms have limited specificity for locating reentrant circuits causing ventricular tachycardia (VT). In this study a new method is described, adaptive template matching (ATM), based on the quantification of beat‐to‐beat changes in electrograms, for locating functional reentrant circuits that are relatively stable and cause monomorphic VT.

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