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METHOD AND APPARATUS FOR PACING SAFETY MARGIN

  • US 20110245890A1
  • Filed: 03/25/2011
  • Published: 10/06/2011
  • Est. Priority Date: 03/30/2010
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a cardiac signal sensing circuit configured to provide an electrical cardiac signal representative of cardiac activity of a subject;

    a therapy circuit configured to deliver electrical pacing stimulation energy to a heart of a subject; and

    a controller circuit communicatively coupled to the cardiac signal sensing circuit and the therapy circuit, and including a capture detection circuit configured to detect cardiac capture, wherein the controller circuit is configured to;

    initiate delivery of pacing stimulation energy to the heart using a first energy level;

    change the stimulation energy level by at least one of;

    a) increasing the stimulation energy from the first energy level until detecting that the pacing stimulation energy induces stable capture, or b) reducing the stimulation energy from the first energy level until detecting that the stimulation energy fails to induce cardiac capture; and

    continue the changing of the stimulation energy level until confirming the stable capture or the failure to induce capture;

    wherein the controller circuit includes a safety margin calculation circuit configured to calculate a safety margin of pacing stimulation energy using at least one of;

    a determined stability of a parameter associated with evoked response; and

    a determined range of energy levels corresponding to intermittent failure to induce capture.

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