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Method and apparatus for atrial arrhythmia episode detection

  • US 9,486,155 B2
  • Filed: 04/24/2015
  • Issued: 11/08/2016
  • Est. Priority Date: 02/18/2015
  • Status: Active Grant
First Claim
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1. A method of determining a P-wave of a cardiac signal in an implantable medical device, comprising:

  • sensing the cardiac signal;

    identifying one or more R-waves within the cardiac signal;

    determining one or more P-wave sensing windows, wherein each of the P-wave sensing window is associated with one of the one or more identified R-waves;

    determining a characteristic P-wave sensing window based on the one or more determined P-wave sensing windows, the characteristic P-wave sensing window having a first portion and a second portion;

    determining a first derivative signal of the cardiac signal within the characteristic P-wave sensing window;

    determining a second derivative signal of the cardiac signal within the characteristic P-wave sensing window;

    analyzing the first derivative and the second derivative of the cardiac signal within the characteristic P-wave window to determine a first set of signal characteristics of the cardiac signal within the first portion of the characteristic P-wave sensing window and a second set of signal characteristics of the cardiac signal within the second portion of the characteristic P-wave sensing window, the signal characteristics including zero crossings of the first derivative signal and amplitudes of the second derivative signal corresponding to the determined zero crossings; and

    detecting the P-wave based on the first and the second set of signal characteristics.

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