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Methods and apparatus for cardiac R-wave sensing in a subcutaneous ECG waveform

  • US 20040049120A1
  • Filed: 09/11/2002
  • Published: 03/11/2004
  • Est. Priority Date: 09/11/2002
  • Status: Active Grant
First Claim
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1. A method of detecting R-waves produced by a depolarization event of a heart in an ECG waveform, comprising the steps of:

  • programming a minimum threshold;

    applying a first threshold for a first period of time;

    applying a second threshold for a second period of time beginning at the end of the first period of time;

    applying a third threshold for a third period of time beginning at the end of the second period of time;

    sensing ECG signals emanating from near a heart with at least one electrode; and

    recording each event as an R-wave, noise, an arrhythmia, or an asystole based on the whether features of the sensed ECG waveform exceed or fail to exceed one or more of the minimum, first, second or third thresholds.

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