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Ischemia detection systems for paced-patients using beat-type dependent baseline datasets

  • US 8,805,498 B1
  • Filed: 11/24/2009
  • Issued: 08/12/2014
  • Est. Priority Date: 11/24/2009
  • Status: Expired due to Fees
First Claim
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1. An implantable device with ischemia detection and heart pacing capability, including:

  • at least one electrode adapted for implantation in a body;

    circuitry coupled to the electrode to sense signals therefrom and to generate corresponding digital signals;

    pacemaker circuitry;

    a processor configured to;

    distinguish between at least two beat types, including ventricularly paced and supraventricular beats;

    collect data from the digital signals for the ventricularly paced and the supraventricular beats within a plurality of heart beat segments;

    derive a ventricularly paced baseline for use with the ventricularly paced beats and a supraventricular baseline for use with the supraventricular beats, wherein the ventricularly paced baseline and the supraventricular baseline are indicative of a normal value of a heart signal parameter over a period of at least one hour defining a first time interval;

    (a) determine whether a current beat during a second time interval is supraventricular or paced, thereby establishing a current beat type;

    (b) determine whether the baseline corresponding to the current beat type is valid for the second time interval;

    (c) when the corresponding baseline in said first time interval is valid for said second time interval, apply predetermined ischemia criteria based on the corresponding baseline to the current beat;

    (d) when the corresponding baseline is invalid for said second time interval, apply ischemia criteria selected from the group of;

    collecting a plurality of the current beat type over a predetermined time interval;

    apply a time rate of change of a heart rate feature over said predetermined time interval;

    or apply the baseline in said first time interval with a correction factor over said second time interval.

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