Ventricular Fibrillation Detection
First Claim
1. A method for detecting a ventricular fibrillation event in an electrocardiogram (ECG) signal, the method comprising:
- obtaining an ECG signal;
applying a transform to the ECG signal to obtain an analytical pair, the analytical pair including the ECG signal and the transformed ECG signal;
determining a speed-amplitude from the analytical pair; and
identifying an onset of a ventricular fibrillation event based on at least one of a value of a cost function of the speed-amplitude over a window and a quantity of occurrences that the speed-amplitude crosses a threshold over the window.
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Accused Products
Abstract
Systems and techniques are disclosed for determining the onset and offset of a ventricular fibrillation event and for distinguishing ventricular fibrillation from noise. In some examples, an electrocardiogram (ECG) signal is obtained; a transform is applied to the ECG signal to obtain an analytical pair, the analytical pair including the ECG signal and the transformed ECG signal; a speed-amplitude is determined from the analytical pair; and an onset of a ventricular fibrillation event is identified based at least one of a value of a cost function of the speed-amplitude over a window and a quantity of occurrences the speed-amplitude crosses a threshold over the window.
61 Citations
33 Claims
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1. A method for detecting a ventricular fibrillation event in an electrocardiogram (ECG) signal, the method comprising:
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obtaining an ECG signal; applying a transform to the ECG signal to obtain an analytical pair, the analytical pair including the ECG signal and the transformed ECG signal; determining a speed-amplitude from the analytical pair; and identifying an onset of a ventricular fibrillation event based on at least one of a value of a cost function of the speed-amplitude over a window and a quantity of occurrences that the speed-amplitude crosses a threshold over the window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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obtaining an electrocardiogram (ECG) signal; applying a transform to the ECG signal to obtain an analytical pair, the analytical pair including the ECG signal and the transformed ECG signal; determining a speed-amplitude from the analytical pair; and identifying an offset of a ventricular fibrillation event based on at least one of a value of a cost function of the speed-amplitude over a window and a quantity of occurrences that the speed-amplitude crosses a threshold over the window. - View Dependent Claims (10, 11)
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12. A machine-readable medium encoding a computer program product operable to cause data processing apparatus to perform operations comprising:
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obtaining an ECG signal; applying a transform to the ECG signal to obtain an analytical pair, the analytical pair including the ECG signal and the transformed ECG signal; determining a speed-amplitude from the analytical pair; and identifying an onset of a ventricular fibrillation event based on at least one of a value of a cost function of the speed-amplitude over a window and a quantity of occurrences that the speed-amplitude crosses a threshold over the window. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A machine-readable medium encoding a computer program product operable to cause data processing apparatus to perform operations comprising:
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obtaining an electrocardiogram (ECG) signal; applying a transform to the ECG signal to obtain an analytical pair, the analytical pair including the ECG signal and the transformed ECG signal; determining a speed-amplitude from the analytical pair; and identifying an offset of a ventricular fibrillation event based on at least one of a value of a cost function of the speed-amplitude over a window and a quantity of occurrences that the speed-amplitude crosses a threshold over the window. - View Dependent Claims (21, 22)
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23. A cardiac monitoring apparatus comprising:
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an input element; a processor; and a machine-readable medium encoding instructions operable to cause the processor to perform operations comprising; obtaining an ECG signal; applying a transform to the ECG signal to obtain an analytical pair, the analytical pair including the ECG signal and the transformed ECG signal; determining a speed-amplitude from the analytical pair; and identifying an onset of a ventricular fibrillation event based on at least one of a value of a cost function of the speed-amplitude over a window and a quantity of occurrences that the speed-amplitude crosses a threshold over the window. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. A cardiac monitoring apparatus comprising:
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an input element; a processor; and a machine-readable medium encoding instructions operable to cause the processor to perform operations comprising; obtaining an electrocardiogram (ECG) signal; applying a transform to the ECG signal to obtain an analytical pair, the analytical pair including the ECG signal and the transformed ECG signal; determining a speed-amplitude from the analytical pair; and identifying an offset of a ventricular fibrillation event based on at least one of a value of a cost function of the speed-amplitude over a window and a quantity of occurrences that the speed-amplitude crosses a threshold over the window. - View Dependent Claims (32, 33)
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Specification