Multi-parameter arrhythmia discrimination
First Claim
1. An arrhythmia discrimination method, comprising:
- sensing electrocardiogram signals at a subcutaneous non-intrathoracic location;
receiving signals associated with a non-electrophysiological cardiac source, the received signals comprising at least one of heart sound signals, pulse oximetry signals, impedance signals indicative of cardiac activity, acoustic emission information, blood-flow information, and heart rate information;
verifying that the electrocardiogram signals comprise a cardiac signal using the non-electrophysiological signal;
discriminating, using the electrocardiogram signals and non-electrophysiologic signals, between a normal sinus rhythm and a cardiac arrhythmia; and
withholding delivery of subcutaneous non-intrathoracic cardiac stimulation therapy if the sensed electrocardiogram signals do not comprise the cardiac signal.
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Accused Products
Abstract
An arrhythmia discrimination device and method involves receiving electrocardiogram signals and non-electrophysiologic signals at subcutaneous locations. Both the electrocardiogram-signals and non-electrophysiologic signals are used to discriminate between normal sinus rhythm and an arrhythmia. An arrhythmia may be detected using electrocardiogram signals, and verified using the non-electrophysiologic signals. A detection window may be initiated in response to receiving the electrocardiogram signal, and used to determine whether the non-electrophysiologic signal is received at a time falling within the detection window. Heart rates may be computed based on both the electrocardiogram signals and non-electrophysiologic signals. The rates may be used to discriminate between normal sinus rhythm and arrhythmia, and used to determining absence of an arrhythmia.
232 Citations
33 Claims
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1. An arrhythmia discrimination method, comprising:
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sensing electrocardiogram signals at a subcutaneous non-intrathoracic location; receiving signals associated with a non-electrophysiological cardiac source, the received signals comprising at least one of heart sound signals, pulse oximetry signals, impedance signals indicative of cardiac activity, acoustic emission information, blood-flow information, and heart rate information; verifying that the electrocardiogram signals comprise a cardiac signal using the non-electrophysiological signal; discriminating, using the electrocardiogram signals and non-electrophysiologic signals, between a normal sinus rhythm and a cardiac arrhythmia; and withholding delivery of subcutaneous non-intrathoracic cardiac stimulation therapy if the sensed electrocardiogram signals do not comprise the cardiac signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An arrhythmia discrimination method, comprising:
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sensing an electrocardiogram signal at a subcutaneous non-intrathoracic location; receiving a signal associated with a non-electrophysiological cardiac source; verifying that the sensed electrocardiogram signal comprises a cardiac signal using the non-electrophysiological cardiac signal; detecting a cardiac arrhythmia using one of the sensed electrocardiogram signal and the verified cardiac signal; confirming the detection of the cardiac arrhythmia by performing a correlation between the electrocardiogram signal and the non-electrophysiological cardiac signal; and withholding treatment of the cardiac arrhythmia if the sensed electrocardiogram signal does not comprise the cardiac signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An implantable cardiac device, comprising:
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an implantable housing; an electrode arrangement configured for subcutaneous non-intrathoracic placement; detection circuitry provided in the housing and coupled to the electrode arrangement, the detection circuitry configured to detect electrocardiogram signals; a sensor configured to sense signals associated with a non-electrophysiological cardiac source, the sensor comprising at least one of a microphone, acoustic transducer, blood-flow transducer, pulse oximeter, and photoplethysmography circuitry; energy delivery circuitry coupled to the electrode arrangement; and a processor provided in the housing and coupled to the detection circuitry, sensor, and energy delivery circuitry, the processor using the non-electrophysiological signals to verify that the detected electrocardiogram signals comprise a cardiac signal, the processor withholding energy delivery if the detected electrocardiogram signals do not comprise the cardiac signal. - View Dependent Claims (29, 30, 31, 32, 33)
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Specification