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Acute ischemia detection based on parameter value range analysis

  • US 8,682,422 B2
  • Filed: 03/07/2013
  • Issued: 03/25/2014
  • Est. Priority Date: 08/25/2010
  • Status: Active Grant
First Claim
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1. A cardiac monitor comprising:

  • (a) a sensor adapted to sense an analog signal from a 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 ST deviations from the digitized waveform, the plurality of ST deviations being characterized by a statistical distribution having a lower boundary and an upper boundary;

    (ii) storing data pertaining to the plurality of ST deviations in a form that enables characteristics of the statistical distribution to be computed;

    (iii) locate the lower boundary value of the stored data from said statistical distribution;

    (iv) form a lower detection threshold that is a function of the difference between the lower boundary value and a preset value;

    (v) compute a subsequent ST deviation from the digitized waveform; and

    (vi) apply a test to detect a cardiac event, wherein the test is based on the subsequent ST deviation and the lower detection threshold.

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