Method to detect noise in a wearable cardioverter defibrillator
AssigneeWest Affum Holdings DAC
InventorJaeho Kim
Life of this patent
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Abstract
In at least one example, a method to detect noise levels in electrocardiogram (ECG) signals is provided. The method includes connecting to at least three sensing electrodes and obtaining a signal from each of the at least three sensing electrodes. The method also includes defining at least three channels between the at least three electrodes. The method includes calculating a morphological similarity value of at least one combination of the at least three channels based at least in part on the obtained signal from each of the at least three sensing electrodes and determining a noise level based at least in part on the calculated morphological similarity value.
Claims20
A method for detecting noise in an electrocardiogram (ECG) signal of a patient wearing a wearable cardioverter defibrillator (WCD), the method comprising:
- receiving, by a processor of the WCD, signals from at least three sensing electrodes comprising a first sensing electrode at a first location, a second sensing electrode at a second location, and a third sensing electrode at a third location on the patient, the at least three sensing electrodes configured to monitor electrical activity of a heart of the patient;
- determining, by the processor, a number of sensing electrodes that are in an on state from the at least three sensing electrodes;
- responsive to determining that at least two of the at least three sensing electrodes are in the on state, computing, by the processor, feature correlation coefficient (FCC) values for active channels defined between the at least three sensing electrodes;
- determining, by the processor, whether the computed FCC values exceed a predetermined threshold;
- responsive to determining that the computed FCC values exceed the predetermined threshold, analyzing, by the processor, at least one of the signals from the at least three sensing electrodes for a shockable heart rhythm;
- issuing a shock alert, by the processor, to the patient for delivering shock upon detection of the shockable heart rhythm;
- and
- responsive to determining that the computed FCC values are below the predetermined threshold, suspending rhythm analysis of the at least one of the signals for a predetermined time period.
A method for detecting noise in an electrocardiogram (ECG) signal of a patient wearing a wearable cardioverter defibrillator (WCD), the method comprising:
- receiving signals from at least three sensing electrodes that include a first sensing electrode, a second sensing electrode, and a third sensing electrode, the at least three sensing electrodes configured to monitor electrical activity of a heart of the patient;
- obtaining, during the monitoring of the electrical activity of the heart of the patient, a first signal from the first sensing electrode, wherein the first signal is based on a cardiac rhythm measured by the first sensing electrode during a first time period;
- obtaining, during the monitoring, a second signal from the second sensing electrode, wherein the second signal is based on the cardiac rhythm measured by the second sensing electrode during the first time period;
- obtaining, during the monitoring, a third signal from the third sensing electrode, wherein the third signal is based on the cardiac rhythm measured by the third sensing electrode during the first time period;
- defining, during the monitoring, at least three channels between the at least three sensing electrodes;
- calculating, during the monitoring, a first morphological similarity value of at least one combination of the at least three channels by comparing the first signal with at least one of the second signal or the third signal;
- determining whether the first morphological similarity value calculated for the at least one combination of the at least three channels is below a predetermined threshold;
- responsive to determining that the first morphological similarity value is below the predetermined threshold, obtaining an additional signal from each of the at least three sensing electrodes after the first time period has elapsed;
- calculating a second morphological similarity value of at least one combination of the at least three channels based, at least in part, on the additional signal obtained from each of the at least three sensing electrodes;
- determining whether the second morphological similarity value is below the predetermined threshold;
- and
- issuing a noise alert to the patient responsive to determining that the second morphological similarity value is below the predetermined threshold.
Dependencies are inferred from the claim text.