Classification of supraventricular and ventricular cardiac rhythms using cross channel timing algorithm
First Claim
1. An implantable cardiac defibrillator configured to be coupled to a first defibrillation electrode, a second defibrillation electrode, a supraventricular pacing electrode, and a further pacing electrode, the defibrillator comprising:
- a sensing system configured to be coupled to the first defibrillation electrode, the second defibrillation electrode, and the further pacing electrode, and the sensing system configured to detect a first cardiac signal between the first defibrillation electrode and the second defibrillation electrode and a second cardiac signal through the further pacing electrode;
a control system coupled to the sensing system and configured to monitor the first cardiac signal for first cardiac complexes including first model cardiac complexes and first sensed cardiac complexes and the second cardiac signal for second model cardiac complexes;
a pace output circuit coupled to the control system and configured to be coupled to the supraventricular electrode and deliver electrical pulses to the supraventricular pacing electrode under control of the control system, wherein the control system is configured to monitor the first cardiac signal for the first model cardiac complexes and the second cardiac signal for the second model cardiac complexes as the electrical pulses are delivered to the supraventricular pacing electrode;
a morphology analyzing circuit coupled to the control system and configured to create a template feature vector using the first model cardiac complexes and the second model cardiac complexes; and
a vector comparison circuit coupled to the morphology analyzing circuit and configured to classify each of the first sensed cardiac complexes as being between a ventricular tachycardia complex or a supraventricular complex using the template feature vector.
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Abstract
A system and method for classifying cardiac complexes sensed during a tachycardia episode. A first cardiac signal and a second cardiac signal are sensed, where the first cardiac signal has a voltage. A first cardiac complex and a second cardiac complex of a cardiac cycle are detected in the first and second cardiac signal, respectively. A predetermined alignment feature is identified in the second cardiac complex. A datum is defined, or positioned, at a specified interval from the predetermined alignment feature of the second cardiac complex. Voltage values are then measured from the first cardiac complex at each of two or more measurement intervals from the datum. The voltage values are then compared voltage values measured from NSR cardiac complexes to classify the first cardiac complex is either a ventricular tachycardia complex or a supraventricular tachycardiac complex.
158 Citations
20 Claims
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1. An implantable cardiac defibrillator configured to be coupled to a first defibrillation electrode, a second defibrillation electrode, a supraventricular pacing electrode, and a further pacing electrode, the defibrillator comprising:
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a sensing system configured to be coupled to the first defibrillation electrode, the second defibrillation electrode, and the further pacing electrode, and the sensing system configured to detect a first cardiac signal between the first defibrillation electrode and the second defibrillation electrode and a second cardiac signal through the further pacing electrode; a control system coupled to the sensing system and configured to monitor the first cardiac signal for first cardiac complexes including first model cardiac complexes and first sensed cardiac complexes and the second cardiac signal for second model cardiac complexes; a pace output circuit coupled to the control system and configured to be coupled to the supraventricular electrode and deliver electrical pulses to the supraventricular pacing electrode under control of the control system, wherein the control system is configured to monitor the first cardiac signal for the first model cardiac complexes and the second cardiac signal for the second model cardiac complexes as the electrical pulses are delivered to the supraventricular pacing electrode; a morphology analyzing circuit coupled to the control system and configured to create a template feature vector using the first model cardiac complexes and the second model cardiac complexes; and a vector comparison circuit coupled to the morphology analyzing circuit and configured to classify each of the first sensed cardiac complexes as being between a ventricular tachycardia complex or a supraventricular complex using the template feature vector. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system, comprising:
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a supraventricular pacing electrode; a further pacing electrode; at least a first defibrillation electrode and a second defibrillation electrode; a sensing system coupled to the supraventricular pacing electrode, the further pacing electrode, the first defibrillation electrode, and the second defibrillation electrode, the sensing system configured to detect a first cardiac signal between the first defibrillation electrode and the second defibrillation electrode and detect a second cardiac signal through the further pacing electrode; a control system coupled to the sensing system and configured to monitor the first cardiac signal for first cardiac complexes including first model cardiac complexes and first sensed cardiac complexes and the second cardiac signal for second model cardiac complexes; a pace output circuit coupled to the control system and configured to deliver electrical pulses to the supraventricular pacing electrode under control of the control system, wherein the control system is configured to monitor the first cardiac signal for the first model cardiac complexes and monitor the second cardiac signal for second model cardiac complexes as the electrical pulses are delivered to the supraventricular pacing electrode; an R-wave detector circuit coupled to the control system and configured to detect the second model cardiac complexes in the second cardiac signal; an alignment circuit coupled to the R-wave detector and configured to analyze each of the second model cardiac complexes to locate a predetermined alignment feature on each of the second model cardiac complexes and positions a datum at a specified interval from the alignment feature on each of the second model cardiac complexes; and a morphology analyzing circuit coupled to the control system and configured to receive the first model cardiac complexes for creation of a template feature vector for classification of the first sensed cardiac complexes and measure a voltage value of the first cardiac signal at each of two or more measurement intervals from the datum for each of the first model cardiac complexes from which the template feature vector is created from the voltage value of the first cardiac signal at each of two or more measurement intervals from the datum for each of the first model cardiac complexes. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An implantable cardiac defibrillator configured to be coupled to a first defibrillation electrode, a second defibrillation electrode, a supraventricular pacing electrode, and a further pacing electrode, the defibrillator comprising:
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a sensing system configured to be coupled to the first defibrillation electrode, the second defibrillation electrode, and the further pacing electrode and detect a first cardiac signal between the first defibrillation electrode and the second defibrillation electrode and a second cardiac signal through the further pacing electrode; a control system coupled to the sensing system and configured to monitor the first cardiac signal for first cardiac complexes including first model cardiac complexes and first sensed cardiac complexes and the second cardiac signal for second model cardiac complexes; a pace output circuit coupled to the control system and configured to be coupled to the supraventricular electrode and deliver electrical pulses to the supraventricular pacing electrode under control of the control system, wherein the control system is configured to monitor the first cardiac signal for the first model cardiac complexes and the second cardiac signal for second model cardiac complexes as the electrical pulses are delivered to the supraventricular pacing electrode; an R-wave detector circuit coupled to the control system and configured to detect the second model cardiac complexes in the second cardiac signal; an alignment circuit coupled to the R-wave detector and configured to analyze each of the second model cardiac complexes to locate a predetermined alignment feature on each of the second model cardiac complexes and positions a datum at a specified interval from the alignment feature on the each of the second model cardiac complexes; and a morphology analyzing circuit coupled to the control system and configured to receive the first model cardiac complexes for creation of a template feature vector for classification of the first sensed cardiac complexes and measure a voltage value of the first cardiac signal at each of two or more measurement intervals from the datum for each of the first model cardiac complexes from which the template feature vector is created from the voltage value of the first cardiac signal at each of two or more measurement intervals from the datum for each of the first model cardiac complexes. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification