Non-invasive monitoring and treatment of subjects in cardiac arrest using ECG parameters predictive of outcome
First Claim
1. An apparatus that non-intrusively provide 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 sample of electrical signals, comprising:
- an analyzer for transforming said domain samples of an electrocardiogram of a heart in one of ventricular fibrillation and asystole to a frequency domain power spectrum and for determining at least one parameter of said power spectrum that is predictive of a clinically relevant cardiac arrest outcome for the subject, said outcome being the subject surviving until an occurrence of at least one particular future event; and
a processor that resolves said at least one parameter to a clinically useful characteristic of the subject'"'"'s heart.
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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.
188 Citations
32 Claims
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1. An apparatus that non-intrusively provide 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 sample of electrical signals, comprising:
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an analyzer for transforming said domain samples of an electrocardiogram of a heart in one of ventricular fibrillation and asystole to a frequency domain power spectrum and for determining at least one parameter of said power spectrum that is predictive of a clinically relevant cardiac arrest outcome for the subject, said outcome being the subject surviving until an occurrence of at least one particular future event; and a processor that resolves said at least one parameter to a clinically useful characteristic of the subject'"'"'s heart. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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 of an electrocardiogram of a heart in one of ventricular fibrillation and asystole to a frequency domain power spectrum and for determining a value that is predictive of the subject surviving until occurrence of at least one particular future event based on 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; wherein said processor is adapted to controlling said therapy-administering device as a function of said value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. 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 of an electrocardiogram of a heart in one of ventricular fibrillation and asystole to a frequency domain power spectrum and for determining at least two frequency parameters that are predictive of a clinically relevant cardiac arrest outcome for the subject based upon 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; wherein said processor is adapted to controlling said therapy-administering device as a function of said at least two frequency parameters. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification