External discrimination between pace pulses at different heart locations
First Claim
1. A system comprising:
- first, second, and third input terminals to receive heart signals from respective external first, second, and third electrodes attached to a subject;
at least one pace pulse detector circuit, coupled to the first, second, and third input terminals, to detect from the heart signals first and second pace pulses delivered to different locations of the heart, the pace pulse detector circuit comprising an amplifier circuit to provide polarity information about the first and second pace pulses; and
a logic circuit, coupled to the pace pulse detector circuit, to assign a first location assignment to the first and a second location assignment to the second pace pulse using at least in part the polarity information about the first and second pace pulses.
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Abstract
This document discusses, among other things, an external device capable of independently distinguishing between pace pulses delivered by an implantable cardiac rhythm management device to different locations of a subject'"'"'s heart. In one example, polarity of the pace pulses is detected along two different electrocardiograph (ECG) vectors defined by three external skin electrodes. In a further example, the detection of a ventricular depolarization is also used to assign location information to pace pulses. In another example, characterizing information (e.g., polarity, amplitude, pulsewidth, time difference between a pace pulse and a corresponding heart depolarization) is used to classify pace pulses into distinct classes to which location information can be assigned. An ECG display/recorder of the external device is capable of annotating pace pulses or markers using the location information.
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Citations
21 Claims
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1. A system comprising:
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first, second, and third input terminals to receive heart signals from respective external first, second, and third electrodes attached to a subject;
at least one pace pulse detector circuit, coupled to the first, second, and third input terminals, to detect from the heart signals first and second pace pulses delivered to different locations of the heart, the pace pulse detector circuit comprising an amplifier circuit to provide polarity information about the first and second pace pulses; and
a logic circuit, coupled to the pace pulse detector circuit, to assign a first location assignment to the first and a second location assignment to the second pace pulse using at least in part the polarity information about the first and second pace pulses. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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receiving heart signals from external first, second, and third electrodes attached to a subject;
detecting respective electric fields of at least one first pacing pulse delivered to a first location of the heart and at least one second pacing pulse delivered to a second location of the heart; and
assigning one of first and second location assignments to each of the first and second pacing pulses at least in part using respective polarities of the respective electric fields. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system comprising:
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first, second, and third input terminals to receive heart signals from respective external first, second, and third electrodes attached to a subject;
at least one pace pulse detector circuit, coupled to the first, second, and third input terminals, to detect from the heart signals first and second pace pulses delivered to different locations of the heart, and to provide at least one of an amplitude of the pace pulses, a pulsewidth of the pace pulses, and a time difference between one of the pace pulses and a corresponding heart depolarization associated with said one of the pace pulses;
a depolarization detector circuit, coupled to at least one of the first, second, and third inputs, to detect whether a corresponding heart depolarization occurred within a predetermined time period of at least one of the first and second pace pulses; and
a logic circuit, coupled to the pace pulse detector circuit, and configured to classify the pace pulses into distinct classes using at least one of the amplitude, the pulsewidth, the polarity, and the time difference, and to compute location assignments for the distinct classes at least in part using the detected heart depolarizations associated with the pace pulses. - View Dependent Claims (16, 17, 18)
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19. A method comprising:
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receiving heart signals from external first, second, and third electrodes attached to a subject;
detecting pace pulses from the heart signals;
detecting any heart depolarizations associated with the pace pulses;
detecting at least one of an amplitude of the pace pulses, a pulsewidth of the pace pulses, a polarity of the pace pulses, and a time difference between each one of the pace pulses and a corresponding heart depolarization associated with said one of the pace pulses;
classifying the pace pulses into distinct classes using at least one of the amplitude, the pulsewidth, the polarity, and the time difference; and
computing location assignments for the distinct classes at least in part using the detected heart depolarizations associated with the pace pulses. - View Dependent Claims (20, 21)
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Specification