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Method and apparatus for improving the accuracy of atrial fibrillation detection in lossy data systems

  • US 7,734,335 B2
  • Filed: 09/29/2005
  • Issued: 06/08/2010
  • Est. Priority Date: 09/29/2005
  • Status: Expired due to Fees
First Claim
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1. A method of detecting a cardiac atrial fibrillation event in a non-continuous electrocardiogram (EKG) signal, the method comprising:

  • a) detecting a portion of the EKG signal comprising cardiac beats, wherein the portion includes at least one gap;

    b) measuring a duration of the gap in the detected portion of the EKG signal;

    c) computing a plurality of inter-beat intervals using the cardiac beats, wherein a computed inter-beat interval of the plurality is selected if the measured gap duration in the detected portion of the EKG signal is not more than a fraction alpha of the computed inter-beat interval;

    d) computing a variance of the selected inter-beat intervals;

    e) classifying the portion of the EKG signal as indicative of an atrial fibrillation event if the computed variance of the classified portion of the EKG signal exceeds a pre-determined value V;

    f) discarding the portion of the EKG signal classified as indicative of atrial fibrillation if the classified portion has a duration less than a pre-determined threshold S; and

    g) annotating the EKG signal, a non-discarded portion of the EKG signal having the computed variance that exceeds the pre-determined value V being annotated as an atrial fibrillation event.

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