Non-invasive monitoring and treatment of subjects in cardiac arrest using ECG parameters predictive of outcome
First Claim
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1. A non-invasive method of guiding the administration of therapy to a subject in ventricular fibrillation or asystole, including:
- connecting electrodes to the body of the subject and detecting from the electrodes an analog electrical potential which is proportional to the electrical potential generated by the subject'"'"'s heart;
sampling the analog potential for a selected interval of time to obtain a set of time domain samples;
detecting the power distribution of said electrical potential by transforming said time domain samples to a frequency domain power spectrum;
monitoring and evaluating at least one frequency parameter of said power spectrum that is predictive of a clinically relevant cardiac arrest outcome for the subject, said at least one parameter selected from the group consisting of at least centroid frequency and peak power frequency; and
using a monitored evaluation of said selected frequency parameter in administering therapy to the subject.
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Abstract
A method and apparatus for determining the metabolic state of the myocardium of a subject in ventricular fibrillation or asystole and/or for guiding therapeutic interventions. Electrocardiogram signals of the subject'"'"'s heart are transformed to a frequency domain power spectrum, and at least one frequency parameter is monitored and processed to a value predictive of a clinically relevant cardiac arrest outcome. In the preferred embodiment, centroid frequency and/or peak power frequency of the power spectrum are monitored.
73 Citations
44 Claims
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1. A non-invasive method of guiding the administration of therapy to a subject in ventricular fibrillation or asystole, including:
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connecting electrodes to the body of the subject and detecting from the electrodes an analog electrical potential which is proportional to the electrical potential generated by the subject'"'"'s heart; sampling the analog potential for a selected interval of time to obtain a set of time domain samples; detecting the power distribution of said electrical potential by transforming said time domain samples to a frequency domain power spectrum; monitoring and evaluating at least one frequency parameter of said power spectrum that is predictive of a clinically relevant cardiac arrest outcome for the subject, said at least one parameter selected from the group consisting of at least centroid frequency and peak power frequency; and using a monitored evaluation of said selected frequency parameter in administering therapy to the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A non-invasive method of determining the metabolic state of the myocardium of a subject in ventricular fibrillation or asystole, including:
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connecting electrodes to the body of the subject and detecting from the electrodes an analog electrical potential which is proportional to the electrical potential generated by the subject'"'"'s heart; sampling the analog potential for a selected interval of time to obtain a time domain signal; detecting the power distribution of said electrical potential by transforming said time domain signal to a frequency domain power spectrum; monitoring at least one amplitude parameter of the time-domain signal and at least one frequency parameter of said power spectrum including at least the centroid frequency that is predictive of a clinically relevant cardiac arrest outcome for the subject; and resolving said monitored parameters to obtain an indication which is directly indicative of the metabolic state of the myocardium of the subject'"'"'s heart. - View Dependent Claims (23, 24, 25, 26, 27)
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28. An apparatus that non-intrusively provides a clinically useful indicator of the condition of the heart of a subject in ventricular fibrillation or asystole from an electrocardiogram of the heart, said electrocardiogram made up of time domain samples of analog electrical signals, comprising:
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an analyzer for transforming said time domain samples to a frequency domain power spectrum and for determining at least one frequency parameter of said power spectrum that is predictive of a clinically relevant cardiac arrest outcome for the subject, said at least one frequency parameter including the centroid frequency of said frequency domain power spectrum; and a processor coupled to said analyzer to resolve said at least one parameter to a clinically useful indicator of a predetermined characteristic of the subject'"'"'s heart. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. An apparatus for guiding the administration of therapy to a subject in ventricular fibrillation or asystole from an electrocardiogram of the heart made up of time domain samples of analog electrical potential, comprising:
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an analyzer for transforming said time domain samples to a frequency domain power spectrum and for determining a value that is predictive of a clinically relevant cardiac arrest outcome for the subject based on the centroid frequency of said frequency domain power spectrum and the peak power frequency of said frequency domain power spectrum; a processor coupled to said analyzer; and at least one therapy-administering device coupled to and controlled by said processor for administering therapy to the subject as a function of said determined value. - View Dependent Claims (40, 41, 42, 43, 44)
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Specification