Acute ischemia detection based on parameter value range analysis
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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Abstract
A heart monitor is disclosed. The monitor computes ST segment deviations and stores the results in heart rate based histograms. Periodically, the monitor analyzes the histogram data to determine a normal range of ST deviation for a particular heart rate range. The monitor computes heart rate dependent ischemia detection thresholds based on the upper and lower boundaries of the normal range.
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6 Claims
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1. A cardiac monitor comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification