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Threshold adjustment schemes for acute ischemia detection

  • US 8,428,704 B2
  • Filed: 10/28/2010
  • Issued: 04/23/2013
  • Est. Priority Date: 08/25/2010
  • Status: Active Grant
First Claim
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1. A cardiac monitor for detecting a cardiac event, the monitor comprising:

  • (a) a sensor for sensing an analog signal from a human heart;

    (b) a device coupled to the sensor, the device having an analog-to-digital circuit system contained therein for digitizing the analog signal to produce a digitized waveform;

    (c) a processor electrically coupled to the analog-to-digital circuit system, said processor configured to;

    (i) compute a plurality of values of a heart signal parameter from the digitized waveform, the plurality of values of the heart signal parameter being characterized by a plurality of statistical distributions corresponding to a plurality of heart rates, wherein each statistical distribution is characterized by an upper boundary and a lower boundary and a dispersion;

    (ii) store data pertaining to the plurality of values of the heart signal parameter in a form that enables characteristics of first and second statistical distributions to be computed for first and second heart rates;

    (iii) determine a boundary value of the heart signal parameter associated with the second heart rate;

    (iv) determine a measure of the number of data points of the first statistical distribution;

    (v) operative when the number of data points indicates the first statistical distribution is insufficient, compute a detection threshold associated with the first heart rate, wherein the detection threshold is based on the boundary value of the heart signal parameter associated with the second heart rate;

    (vi) apply a test to detect a cardiac event, wherein the test is based on the detection threshold.

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