Using chest velocity to process physiological signals to remove chest compression artifacts
First Claim
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1. A method of analyzing a physiological signal during application of chest compressions, the method comprising:
- acquiring a physiological signal during application of chest compressions;
acquiring the output of a sensor from which information on the velocity of chest compressions can be determined;
using the information on the velocity to reduce at least one signal artifact in the physiological signal resulting from the chest compressions; and
using a ventricular fibrillation detection algorithm for processing the physiological signal with reduced artifact to estimate whether a ventricular fibrillation is present,wherein using the information on the velocity to reduce at least one signal artifact in the physiological signal comprises using an adaptive filter that is adjusted to remove chest compression artifacts,wherein a difference signal is produced, the difference signal being representative of the difference between the physiological signal fed into the adaptive filter and the physiological signal after artifact reduction by the adaptive filter,wherein the difference signal provides a measure of the amount of artifact in the physiological signal, andfurther comprising the step of using the difference signal to modify the subsequent processing of the physiological signal,wherein, if the difference signal indicates that the amount of artifact exceeds a first threshold, the ventricular fibrillation detection algorithm is modified to make it more resistant to being influenced by the artifact.
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Abstract
A method of analyzing a physiological (e.g., an ECG) signal during application of chest compressions. The method includes acquiring a physiological signal during application of chest compressions; acquiring the output of a sensor from which information on the velocity of chest compressions can be determined; and using the information on the velocity to reduce at least one signal artifact in the physiological signal resulting from the chest compressions.
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Citations
31 Claims
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1. A method of analyzing a physiological signal during application of chest compressions, the method comprising:
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acquiring a physiological signal during application of chest compressions; acquiring the output of a sensor from which information on the velocity of chest compressions can be determined; using the information on the velocity to reduce at least one signal artifact in the physiological signal resulting from the chest compressions; and using a ventricular fibrillation detection algorithm for processing the physiological signal with reduced artifact to estimate whether a ventricular fibrillation is present, wherein using the information on the velocity to reduce at least one signal artifact in the physiological signal comprises using an adaptive filter that is adjusted to remove chest compression artifacts, wherein a difference signal is produced, the difference signal being representative of the difference between the physiological signal fed into the adaptive filter and the physiological signal after artifact reduction by the adaptive filter, wherein the difference signal provides a measure of the amount of artifact in the physiological signal, and further comprising the step of using the difference signal to modify the subsequent processing of the physiological signal, wherein, if the difference signal indicates that the amount of artifact exceeds a first threshold, the ventricular fibrillation detection algorithm is modified to make it more resistant to being influenced by the artifact. - View Dependent Claims (2)
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3. A method of analyzing a physiological signal during application of chest compressions, the method comprising:
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acquiring a physiological signal during application of chest compressions; acquiring the output of a sensor from which information on the velocity of chest compressions can be determined; and using the information on the velocity to reduce at least one signal artifact in the physiological signal resulting from the chest compressions, wherein using the information on the velocity to reduce at least one signal artifact in the physiological signal comprises using an adaptive filter that is adjusted to remove chest compression artifacts, wherein a difference signal is produced, the difference signal being representative of the difference between the physiological signal fed into the adaptive filter and the physiological signal after artifact reduction by the adaptive filter, and wherein the adaptive filter comprises the capability of being automatically reset when the difference signal exceeds a threshold.
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4. A method of analyzing a physiological signal during application of chest compressions, the method comprising:
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acquiring a physiological signal during application of chest compressions; acquiring the output of a sensor from which information on the velocity of chest compressions can be determined; and using the information on the velocity to reduce at least one signal artifact in the physiological signal resulting from the chest compressions, wherein using the information on the velocity to reduce at least one signal artifact in the physiological signal comprises using an adaptive filter that is adjusted to remove chest compression artifacts, and wherein the adaptive filter comprises the capability of dynamically changing a step size and thus improving a relationship of convergence and stability of the filter.
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5. A method of analyzing a physiological signal during application of chest compressions, the method comprising:
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acquiring a physiological signal during application of chest compressions; acquiring the output of a sensor from which information on the velocity of chest compressions can be determined; and using the information on the velocity to reduce at least one signal artifact in the physiological signal resulting from the chest compressions, wherein using the information on the velocity to reduce at least one signal artifact in the physiological signal comprises using an adaptive filter that is adjusted to remove chest compression artifacts, further comprising a ventricular fibrillation detection algorithm for processing the physiological signal with reduced artifact to estimate whether a ventricular fibrillation is present, further comprising a preprocessing step that detects when chest compressions are applied and automatically initiates the adaptive filter, further comprising a time-aligning process performed on the physiological and velocity signals, wherein the time aligning process aligns the two signals relative to the compressions, and further comprising adaptive filtering of the output of the time aligning process, wherein the adaptive filtering reduces the error between the physiological and velocity signals.
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6. A method of analyzing a physiological signal during application of chest compressions, the method comprising:
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acquiring a physiological signal during application of chest compressions; acquiring the output of a sensor from which information on the velocity of chest compressions can be determined; and using the information on the velocity to reduce at least one signal artifact in the physiological signal resulting from the chest compressions, wherein using the information on the velocity to reduce at least one signal artifact in the physiological signal comprises using an adaptive filter that is adjusted to remove chest compression artifacts and wherein the adaptive filter employs adaptive equalization. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification