Method for discriminating between ventricular and supraventricular arrhythmias
AssigneeCameron Health, Inc.
InventorsAlan H. Ostroff, Jay A. Warren, Gust H. Bardy
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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.
Claims21
(canceled)
An implantable cardiac device comprising a battery, operational circuitry coupled to the battery, and a housing for at least the operational circuitry, in which the operational circuitry includes input circuitry configured to couple to at least three electrodes to define a plurality of sensing vectors, wherein the operational circuitry is configured to analyze electrical signals in the plurality of sensing vectors as follows:
- monitoring at least two sensing vectors to identify a signal-to-noise ratio (SNR) for each of the at least two sensing vectors;
- calculating templates for each of the at least two sensing vectors;
- on a cardiac complex-by-cardiac complex basis, selecting a best sensing vector as distinguished by SNR;
- and
- using a corresponding template to assess whether a ventricular arrhythmia is occurring.
An implantable cardiac system comprising a canister housing a battery and operational circuitry coupled to the battery, and a lead having at least three electrodes to define a plurality of sensing vectors, wherein the operational circuitry includes inputs for the at least three electrodes and is configured to analyze electrical signals in the plurality of sensing vectors as follows:
- monitoring at least two sensing vectors to identify a signal-to-noise ratio (SNR) for cardiac complexes captured in each of the at least two sensing vectors;
- calculating templates for each of the at least two sensing vectors;
- on a cardiac complex-by-cardiac complex basis, selecting a best sensing vector as distinguished by SNR;
- and
- performing a template analysis using a template corresponding to the best sensing vector to assess whether a ventricular arrhythmia is occurring.
A method of operation in an implantable cardiac system comprising operational circuitry and at least three of electrodes coupled thereto, in which the operational circuitry includes input circuitry configured to couple to the at least three electrodes to define a plurality of sensing vectors, wherein the method comprises:
- the operational circuitry monitoring at least two sensing vectors to identify a signal-to-noise ratio (SNR) for each of the at least two sensing vectors;
- the operational circuitry calculating templates for each of the at least two sensing vectors;
- on a cardiac complex-by-cardiac complex basis, the operational circuitry selecting a best sensing vector as distinguished by SNR;
- and
- the operational circuitry performing a template analysis using a corresponding template for the best sensing vector to assess whether a ventricular arrhythmia is occurring.
Dependencies are inferred from the claim text.