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Methods and Systems for Discriminating Between Ventricular Waveforms When Ventricular Rate Exceeds Atrial Rate

  • US 20100185111A1
  • Filed: 01/20/2009
  • Published: 07/22/2010
  • Est. Priority Date: 01/20/2009
  • Status: Active Grant
First Claim
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1. A method for discriminating between cardiac signal waveforms using an implantable medical device, said method comprising:

  • sensing atrial waveforms of a heart and determining an atrial rate based on the atrial waveforms;

    sensing ventricular waveforms of the heart and determining a ventricular rate based on first candidate waveforms and second candidate waveforms within the ventricular waveforms;

    determining if the ventricular rate exceeds the atrial rate;

    if the ventricular rate exceeds the atrial rate, comparing each of the first candidate waveforms of the ventricular waveforms and the second candidate waveforms of the ventricular waveforms to a first predetermined waveform template to obtain a first morphology indicator and a second morphology indicator, wherein the first and second morphology indicators represent a degree to which the respective first and second candidate waveforms match the first predetermined waveform template.

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