Method and device for motion and noise immunity in hemodynamic measurement
First Claim
1. A method of measuring hemodynamic performance of a patient'"'"'s heart, comprising:
- obtaining a template waveform representing hemodynamic performance of the heart during a first hemodynamic state;
obtaining an autocharacterization of the template waveform;
identifying a measure from the autocharacterization;
obtaining a test waveform during a second hemodynamic state;
performing a cross-characterization of the template waveform and the test waveform to obtain a cross-characterization function;
identifying a measure from the cross-characterization function; and
measuring a hemodynamic status of the second hemodynamic state by comparing the autocharacterization measure with the cross-characterization measure.
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Abstract
A method and device, such as an implantable cardiac device, for motion and noise immunity in hemodynamic measurement is presented. The method includes obtaining a template waveform representing hemodynamic performance of a heart during a first hemodynamic state and obtaining an autocharacterization measure from an autocharacterization (e.g., autocorrelation) of the template waveform. The method further includes obtaining a test waveform during a second hemodynamic state, performing a cross-characterization (e.g., cross-correlation) of the template waveform and test waveform to identify a cross-characterization measure, and comparing the autocharacterization measure with the cross-characterization measure as a measurement of hemodynamic status of the second hemodynamic state. The device includes hardware and/or software for performing the described method.
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Citations
20 Claims
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1. A method of measuring hemodynamic performance of a patient'"'"'s heart, comprising:
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obtaining a template waveform representing hemodynamic performance of the heart during a first hemodynamic state; obtaining an autocharacterization of the template waveform; identifying a measure from the autocharacterization; obtaining a test waveform during a second hemodynamic state; performing a cross-characterization of the template waveform and the test waveform to obtain a cross-characterization function; identifying a measure from the cross-characterization function; and measuring a hemodynamic status of the second hemodynamic state by comparing the autocharacterization measure with the cross-characterization measure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A device for measuring hemodynamic performance of a patient'"'"'s heart, comprising:
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means for obtaining a template waveform representing hemodynamic performance of the heart during a first hemodynamic state; means for obtaining an autocharacterization of the template waveform; means for identifying a measure from the autocharacterization; means for obtaining a test waveform during a second hemodynamic state; means for performing a cross-characterization of the template waveform and the test waveform to obtain a cross-characterization function; means for identifying a measure from the cross-characterization function; and means for measuring a hemodynamic status of the second hemodynamic state by comparing the autocharacterization measure with the cross-characterization measure. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification