Dynamic ST segment estimation and adjustment
First Claim
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1. A method for estimating ST segments of electrocardiographic signals comprising the steps of:
- acquiring a digital representation of electrocardiographic signals from a human subject;
creating a predetermined set of varying heartrates, each of said set having a corresponding value for ST segments;
detecting and measuring R to R intervals in said digital representation of electrocardiographic signals;
calculating an R to R interval average from detected R to R intervals within said digital electrocardiographic signals;
comparing said R to R interval average with said predetermined set of varying heartrates to determine which heartrate of said predetermined set equals said average R to R interval; and
selecting from said predetermined heartrate said corresponding value for ST segment and using said corresponding value for an estimation of ST segment.
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Abstract
A method and apparatus for dynamically estimating the ST segment of a rate varying electrocardiogram by comparing the result yielded from a mathematical relationship between calculated beat averages and a predetermined standard. Typically a table of known heartbeats is made from which means for estimating are created. An average of beat to beat intervals is compared with the means for estimating and the length of the ST segment for any particular beat is derived making it possible to dynamically alter ST segment length for any given heartrate.
49 Citations
20 Claims
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1. A method for estimating ST segments of electrocardiographic signals comprising the steps of:
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acquiring a digital representation of electrocardiographic signals from a human subject; creating a predetermined set of varying heartrates, each of said set having a corresponding value for ST segments; detecting and measuring R to R intervals in said digital representation of electrocardiographic signals; calculating an R to R interval average from detected R to R intervals within said digital electrocardiographic signals; comparing said R to R interval average with said predetermined set of varying heartrates to determine which heartrate of said predetermined set equals said average R to R interval; and selecting from said predetermined heartrate said corresponding value for ST segment and using said corresponding value for an estimation of ST segment. - View Dependent Claims (2, 3, 4)
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5. A stress test system for dynamically changing ST segment length in ECG signals in response to varying heart rates induced by exercise comprising:
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exercise means for accelerating a subject'"'"'s heart rate; ECG acquisition means for obtaining a digital representation of said subjects electrocardiographic signal; computational means for measuring and detecting QRS signals within said digital representation; estimation means derived from a predetermined set of varying heartrates for generating an estimate of ST segment values for detected QRS signals measured within said digital representation; comparison means for comparing measured QRS signals within said digital representation to said estimation means to determine an approximate ST segment length to be used as said estimated ST segment length; and means responsive to said comparison means for adjusting ST segment length within said digital representation to conform to said estimated ST length. - View Dependent Claims (6, 7, 8, 9)
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10. A method for estimating ST segments of electrocardiographic signals comprising the steps of:
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acquiring a digital representation of electrocardiographic signals from a human subject; creating estimation means for estimating ST segments from a given heartrate; calculating a heartrate interval from said digital electrocardiographic signals; comparing said heartrate interval with said estimation means to determine values to be used as an estimated ST segment; and synthesizing said digital representation to reflect said estimated ST segment. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A product for stress test systems made from the process defined by the steps of:
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acquiring a digital representation of electrocardiography signals from a human subject, said digital representation of electrocardiographic signals being from an accelerated heart; creating a predetermined set of varying heartrates, each of said set having a corresponding value for ST segments; detecting and measuring R to R intervals in said digital representation of electrocardiographic signals; calculating an R to R interval average from detected R to R intervals within said digital electrocardiographic signals; comparing said R to R interval average with said predetermined set of varying heartrates to determine which heartrate of said predetermined set equals said average R to R interval; and selecting from said predetermined heartrate said corresponding value for ST segment and using said corresponding value for an estimation of ST segment. - View Dependent Claims (18, 19, 20)
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Specification