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 varying in relation to cardiac activity;
verifying that the electrocardiogram signals comprise a cardiac signal using the received signals;
discriminating, using the electrocardiogram signals and received 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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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 an arrhythmia, and used to determine absence of an arrhythmia.
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Citations
28 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 varying in relation to cardiac activity;
verifying that the electrocardiogram signals comprise a cardiac signal using the received signals;
discriminating, using the electrocardiogram signals and received 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, 14, 15, 16)
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17. 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 and that vary in relation to cardiac activity;
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 sensor signals to verify that the detected electrocardiogram signals comprise a cardiac signal, the processor withholding treatment of the cardiac arrhythmia if the detected electrocardiogram signals do not comprise the cardiac signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification