NOISE DETECTION AND RESPONSE FOR USE WHEN MONITORING FOR ARRHYTHMIAS
First Claim
1. A method of noise detection and response for use when monitoring for arrhythmias, comprising:
- (a) using at least two electrodes to obtain a signal indicative of cardiac electrical activity;
(b) bandpass filtering the signal to obtain a filtered signal;
(c) monitoring for ventricular depolarizations based on comparisons of the filtered signal to a first threshold;
(d) monitoring for arrhythmias based on ventricular depolarization detections that occur as a result of the monitoring at step (c);
(e) monitoring for noise during one or more noise detection windows;
(f) determining, based on results of the monitoring for noise, when it is likely that the monitoring for arrhythmias is adversely affected by noise; and
(g) modifying whether and/or how the monitoring for arrhythmias is performed, when it is determined that the monitoring for arrhythmias is likely adversely affected by noise.
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Accused Products
Abstract
Methods and systems of noise detection and response for use when monitoring for arrhythmias are described herein. At least two electrodes are used to obtain a signal indicative of cardiac electrical activity. The signal is bandpass filtered to obtain a filtered signal. Ventricular depolarizations are monitored for based on comparisons of the filtered signal to a first threshold. Arrhythmias are monitored for based on ventricular depolarization detections that occur as a result of monitoring for ventricular depolarizations. During one or more noise detection windows, noise is monitored for and a likelihood that monitoring for arrhythmias is adversely affected by noise is determined based on results thereof. Whether and/or how the monitoring for arrhythmias is performed is modified when it is determined that monitoring for arrhythmias is likely adversely affected by noise.
55 Citations
27 Claims
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1. A method of noise detection and response for use when monitoring for arrhythmias, comprising:
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(a) using at least two electrodes to obtain a signal indicative of cardiac electrical activity; (b) bandpass filtering the signal to obtain a filtered signal; (c) monitoring for ventricular depolarizations based on comparisons of the filtered signal to a first threshold; (d) monitoring for arrhythmias based on ventricular depolarization detections that occur as a result of the monitoring at step (c); (e) monitoring for noise during one or more noise detection windows; (f) determining, based on results of the monitoring for noise, when it is likely that the monitoring for arrhythmias is adversely affected by noise; and (g) modifying whether and/or how the monitoring for arrhythmias is performed, when it is determined that the monitoring for arrhythmias is likely adversely affected by noise. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An implantable device, comprising:
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one or more sensing circuits configured to obtain, using at least two electrodes, a signal indicative of cardiac electrical activity; one or more filters configured to filter the signal to obtain a bandpass filtered signal; one or more monitors, processors and/or controllers configured to detect ventricular depolarizations based on comparisons of the bandpass filtered signal to a first threshold; monitor for arrhythmias based on ventricular depolarization detections; monitor for noise during one or more noise detection windows; determine when it is likely that the arrhythmia monitoring is adversely affected by noise; and modify whether and/or how the arrhythmias are to be monitored for, when it is determined that the arrhythmia monitoring is likely adversely affected by noise. - View Dependent Claims (22, 23, 24, 25)
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26. A non-implantable device, comprising:
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one or more sensing circuits configured to obtain, using at least two surface electrodes, a signal indicative of cardiac electrical activity; one or more filters configured to filter the signal to obtain a bandpass filtered signal; one or more monitors, processors and/or controllers configured to detect ventricular depolarizations based on comparisons of the bandpass filtered signal to a first threshold; monitor for arrhythmias based on ventricular depolarization detections; monitor for noise during one or more noise detection windows; determine when it is likely that the arrhythmia monitoring is adversely affected by noise; and modify whether and/or how the arrhythmias are to be monitored for, when it is determined that the arrhythmia monitoring is likely adversely affected by noise. - View Dependent Claims (27)
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Specification