LONG-TERM MONITORING FOR DISCRIMINATION OF DIFFERENT HEART RHYTHMS
First Claim
1. A method for discrimination between different types of arrhythmia, the method comprising:
- monitoring the electrical activity of a heart;
determining the duration of heart beat intervals of the heart;
selecting a number of heart beat intervals that will comprise an analysis segment;
calculating an instantaneous heart rate for each of the heart beat intervals in the analysis segment from the duration of the heart beat intervals;
calculating a mean instantaneous heart rate for the analysis segment;
determining a deviation from the mean instantaneous heart rate for each heart beat interval in the analysis segment;
determining a non-linear average value representing the deviation from the mean instantaneous heart rate in the analysis segment;
calculating a test result from a linear combination of the mean instantaneous heart rate and the non-linear average value; and
comparing the test result with a predetermined threshold to discriminate between different types of arrhythmia.
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Abstract
A method and a system for detection of an arrhythmia and discrimination between different types of arrhythmia to determine whether to administer an electric shock to the heart, the method comprising monitoring the electrical activity of a beating heart, selecting a number of heart beat intervals that will comprise an analysis segment; determining an instantaneous heart rate for each of the heart beat intervals with the segment; calculating the mean instantaneous heart rate for the segment; determining the variability of the instantaneous heart rates compared to a mean; using a linear combination of the mean and the non-linear value for comparison with a predetermined threshold to discriminate the type of arrhythmia to automatically decide if intervention is indicated.
24 Citations
20 Claims
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1. A method for discrimination between different types of arrhythmia, the method comprising:
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monitoring the electrical activity of a heart; determining the duration of heart beat intervals of the heart; selecting a number of heart beat intervals that will comprise an analysis segment; calculating an instantaneous heart rate for each of the heart beat intervals in the analysis segment from the duration of the heart beat intervals; calculating a mean instantaneous heart rate for the analysis segment; determining a deviation from the mean instantaneous heart rate for each heart beat interval in the analysis segment; determining a non-linear average value representing the deviation from the mean instantaneous heart rate in the analysis segment; calculating a test result from a linear combination of the mean instantaneous heart rate and the non-linear average value; and comparing the test result with a predetermined threshold to discriminate between different types of arrhythmia. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for automatically determining if intervention with a beating heart is indicated, the method comprising:
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monitoring the electrical activity of a beating heart to detect the arrival time of QRS complex portions of the heart beat; determining the duration of heart beat intervals from the detected arrival time of the QRS complex portions; selecting a number of heart beat intervals to comprise an analysis segment; calculating an instantaneous heart rate for each of the heart beat intervals in an analysis segment; calculating a mean instantaneous heart rate for the analysis segment; determining a deviation from the mean instantaneous heart rate for each heart beat interval in the analysis segment; determining a non-linear average value representing the deviation from the mean instantaneous heart rate in the analysis segment; calculating a test result from a linear combination of the mean instantaneous heart rate and the non-linear average value; and comparing the test result with a predetermined threshold wherein if the test result exceeds the predetermined threshold then intervention is indicated. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification