PARAMETER VALUE REJECTION FOR A CARDIAC MONITOR
First Claim
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1. A cardiac monitor for estimating the value of a heart signal parameter, 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) analyze the waveform to detect a plurality of beats;
(ii) analyze the plurality of beats to generate a corresponding plurality of values of a heart signal parameter;
(iii) compute a parameter value time series by low pass filtering the plurality of values of the heart signal parameter;
(iv) compute a long term average value of the heart signal parameter from the plurality of values over a time period that is at least ten minutes long;
(v) measure the value of the heart signal parameter for a current beat that is one of the plurality of beats, thereby generating a current beat value;
(vi) compare the current beat value with the long term average value of the heart signal parameter, thereby generating a first comparison result indicative of the distance between the current beat value and the long term average value,(vii) based on the first comparison result, selectively updating the time series based on the value of the heart signal parameter for the current beat.
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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 median value of ST deviation. Subsequently, beats are excluded from the computation of the time series if their ST deviations both varies too far from the long term median value and varies too far from the then current time series value.
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Citations
13 Claims
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1. A cardiac monitor for estimating the value of a heart signal parameter, the monitor comprising:
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(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) analyze the waveform to detect a plurality of beats; (ii) analyze the plurality of beats to generate a corresponding plurality of values of a heart signal parameter; (iii) compute a parameter value time series by low pass filtering the plurality of values of the heart signal parameter; (iv) compute a long term average value of the heart signal parameter from the plurality of values over a time period that is at least ten minutes long; (v) measure the value of the heart signal parameter for a current beat that is one of the plurality of beats, thereby generating a current beat value; (vi) compare the current beat value with the long term average value of the heart signal parameter, thereby generating a first comparison result indicative of the distance between the current beat value and the long term average value, (vii) based on the first comparison result, selectively updating the time series based on the value of the heart signal parameter for the current beat. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A cardiac monitor for estimating the value of a heart signal parameter, the monitor comprising:
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(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) analyze the waveform to detect a plurality of beats; (ii) analyze the plurality of beats to generate a corresponding plurality of values of a heart signal parameter; (iii) compute a parameter value time series by low pass filtering the plurality of values of the heart signal parameter; (iv) measuring the value of the heart signal parameter for a current beat that is one of the plurality of beats, thereby generating a current beat value; (v) comparing the current beat value with a measure of a current value of the time series, thereby generating a first comparison result indicative of the distance between the current beat value and the measure of the current value of the time series, (vi) based on the first comparison result, selectively updating the time series based on the value of the heart signal parameter for the current beat.
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Specification