Method and apparatus for detecting changes in electrocardiogram signals
First Claim
1. A method, comprising:
- sensing a first cardiac electrogram signal, where the first cardiac electrogram signal has a voltage and includes a first cardiac complex;
detecting an occurrence of a ventricular activation from the first cardiac complex;
measuring a first voltage value of the first cardiac electrogram signal at a first specified time after the ventricular activation determined from the first cardiac complex;
measuring a second voltage value at a defined portion of the first cardiac electrogram signal;
calculating a comparison value from the first and second voltage values; and
recording the first voltage value when the comparison value is greater than or equal to a predetermined value.
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Abstract
Method and apparatus for detecting changes in electrocardiogram signals. A first cardiac electrogram signal is sensed, where the first cardiac electrogram signal has a voltage and includes a first cardiac complex. A ventricular activation is detected in the first cardiac complex and a first timer is started, where the first timer times a first specified time. A first voltage value is measured from the first cardiac electrogram signal at the first specified time after the ventricular activation. A second voltage value is also measured from a defined portion of the first cardiac electrogram signal. A comparison value is then calculated from the first and second voltage values measured from the first cardiac electrogram signal. The first voltage value is recorded when the comparison value is greater than or equal to a predetermined value.
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Citations
26 Claims
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1. A method, comprising:
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sensing a first cardiac electrogram signal, where the first cardiac electrogram signal has a voltage and includes a first cardiac complex; detecting an occurrence of a ventricular activation from the first cardiac complex; measuring a first voltage value of the first cardiac electrogram signal at a first specified time after the ventricular activation determined from the first cardiac complex; measuring a second voltage value at a defined portion of the first cardiac electrogram signal; calculating a comparison value from the first and second voltage values; and recording the first voltage value when the comparison value is greater than or equal to a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An implantable cardiac rhythm management device, comprising:
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a connector block having at least a first input/output socket; and control circuitry within an implantable housing, the control circuitry including; a ventricular activation detector circuit coupled to the first input/output socket, where the ventricular activation detector circuit receives a first cardiac signal through the first input/output socket and analyzes the first cardiac signal for the occurrence of a ventricular activation in a first cardiac complex; a cardiac morphology detector circuit coupled to the first input/output socket, wherein the cardiac morphology detector circuit is coupled to the ventricular activation detector circuit, and wherein the cardiac morphology detector circuit receives the first cardiac signal through the first input/output socket, analyzes the first cardiac signal for the occurrence of the first cardiac complex, measures a first voltage value from the first cardiac signal at a first specified time after the ventricular activation in the first cardiac complex, and measures a second voltage value of the first cardiac electrogram signal at a defined portion of the first cardiac complex; a cardiac data processing circuit coupled to the ventricular activation detector circuit and the cardiac morphology detector circuit, wherein the cardiac data processing circuit calculates a comparison value from the first and second voltage values; and a microcontroller coupled to the cardiac data processing circuit the ventricular activation detector circuit and the cardiac morphology detector circuit, wherein a memory circuit is coupled to the microcontroller and wherein the microcontroller receives the comparison value from the cardiac data processing circuit and records the first voltage value in the memory when the comparison value is greater than or equal to a predetermined value. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification