Patent ID: 6889081
Filing Date: 2005-05-03
Classification: A61B,G16H

Abstract:
1. A system, comprising: at least one pacing electrode; at least a first defibrillation electrode and a second defibrillation electrode; a sensing system coupled to the at least one pacing electrode and the first defibrillation electrode and the second defibrillation electrode, wherein the sensing system detects a first cardiac signal between the first defibrillation electrode and the second defibrillation electrode and a second cardiac signal through the at least one pacing electrode; a control system coupled to the sensing system, wherein the control system monitors the first cardiac signal for a first cardiac complex and the second cardiac signal for a second cardiac complex, wherein the first cardiac complex and the second cardiac complex represent a cardiac cycle; an alignment circuit coupled to the control system, wherein the alignment circuit detects the first cardiac complex in the first cardiac signal; an R-wave detector circuit coupled to the control system, wherein the R-wave detector circuit detects the second cardiac complex in the second cardiac signal and provides the second cardiac signal to the alignment circuit, wherein the alignment circuit analyzes the second cardiac complex to locate a predetermined alignment feature on the second cardiac complex and positions a datum at a specified interval from the alignment feature on the second cardiac complex, and wherein the alignment circuit selects two or more morphological features alone the first cardiac complex and determines two or more measurement intervals between the datum and the two or more morphological features; and a morphology analyzing circuit coupled to the control system, wherein the morphology analyzing circuit measures a voltage value of the first cardiac signal at each of the two or more measurement intervals from the datum.