Method for discriminating between ventricular and supraventricular arrhythmias
First Claim
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1. A method of cardiac signal analysis in an implantable medical device having at least a housing containing operational circuitry and a plurality of electrodes coupled to the operational circuitry for capturing cardiac signals comprising:
- capturing a cardiac event using at least first and second vector views from the electrodes;
analyzing the captured cardiac event using a first method of analysis by comparing the captured cardiac event as seen from the first vector view to a stored sinus template of the first vector view;
analyzing the captured cardiac event using a second method of analysis including comparing the captured cardiac event as seen from the second vector view to a cardiac event just previous to the captured cardiac event, as seen from the second vector view;
identifying whether an arrhythmia is likely occurring and, if so, distinguishing a supraventricular arrhythmia from a ventricular originating arrhythmia using results from the first and second methods to determine whether a ventricular originating arrhythmia is occurring; and
if a ventricular originating arrhythmia is occurring, directing cardiac defibrillation therapy to the patient.
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Abstract
The present invention is directed toward a detection architecture for use in implantable cardiac rhythm devices. The detection architecture of the present invention provides methods and devices for discriminating between arrhythmias. Moreover, by exploiting the enhanced specificity in the origin of the identified arrhythmia, the detection architecture can better discriminate between rhythms appropriate for device therapy and those that are not.
46 Citations
12 Claims
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1. A method of cardiac signal analysis in an implantable medical device having at least a housing containing operational circuitry and a plurality of electrodes coupled to the operational circuitry for capturing cardiac signals comprising:
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capturing a cardiac event using at least first and second vector views from the electrodes; analyzing the captured cardiac event using a first method of analysis by comparing the captured cardiac event as seen from the first vector view to a stored sinus template of the first vector view; analyzing the captured cardiac event using a second method of analysis including comparing the captured cardiac event as seen from the second vector view to a cardiac event just previous to the captured cardiac event, as seen from the second vector view; identifying whether an arrhythmia is likely occurring and, if so, distinguishing a supraventricular arrhythmia from a ventricular originating arrhythmia using results from the first and second methods to determine whether a ventricular originating arrhythmia is occurring; and if a ventricular originating arrhythmia is occurring, directing cardiac defibrillation therapy to the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An implantable cardiac stimulus device system comprising:
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a housing containing operational circuitry including at least a battery and a controller, the operational circuitry configured to observe electrical cardiac activity of the patient and, if determined necessary, to provide electrical cardiac stimulus to a patient if implanted in the patient; and a lead electrode assembly comprising at least one electrode for use in at least one of observing electrical cardiac activity and/or delivering electrical cardiac stimulus to a patient; wherein the operational circuitry is configured to observe electrical cardiac activity as follows in order to determine whether electrical cardiac stimulus is indicated; capture a cardiac event using at least first and second vector views defined by electrodes included in the lead electrode assembly and/or located on the canister; analyze the captured cardiac event using a first method of analysis which includes comparing the captured cardiac event as seen from the first vector view to a stored sinus template of the first vector view; analyze the captured cardiac event using a second method of analysis including comparing the captured cardiac event as seen from the second vector view to a cardiac event just previous to the captured cardiac event as seen from the second vector view; identify whether an arrhythmia is likely occurring and, if so, distinguish a supraventricular arrhythmia from a ventricular originating arrhythmia using results from the first and second methods to determine whether a ventricular originating arrhythmia is occurring; and determine electrical cardiac stimulus is indicated if a ventricular originating arrhythmia is occurring. - View Dependent Claims (9, 10, 11, 12)
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Specification