Systems for detecting cardiac arrhythmias
First Claim
1. A system for calculating a variability value that is indicative of AF using a sequence of RR intervals, wherein said system comprises a non-volatile computer readable medium storing a plurality of programmatic instructions and wherein said programmatic instructions, when executed:
- obtain a signal sequence comprising a plurality of RR intervals wherein said signal sequence is obtained by monitoring the time intervals between successive heart beats of a patient'"'"'s heart by measuring at least one of electrical activity;
acoustic activity;
trans-thoracic impedance;
blood pressure;
blood velocity;
blood oxygenation;
heart movement and/or deformation;
convert each RR interval in said sequence into an instantaneous heart rate value;
sort said instantaneous heart rate values into ascending order;
calculate differences between each of said sorted successive instantaneous heart rates;
discard two largest differences generated in the previous step; and
calculate a variability value by adding differences which were not discarded.
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Accused Products
Abstract
A system for calculating a variability value that is indicative of AF by obtaining a signal sequence of a plurality of RR intervals by monitoring electrical activity of a patient'"'"'s heart. Each RR interval is converted into an instantaneous heart rate value and sorted into ascending order. The difference between each successive heart rate is calculated, discarding the two largest differences. The variability value is calculated by adding the retained differences.
16 Citations
31 Claims
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1. A system for calculating a variability value that is indicative of AF using a sequence of RR intervals, wherein said system comprises a non-volatile computer readable medium storing a plurality of programmatic instructions and wherein said programmatic instructions, when executed:
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obtain a signal sequence comprising a plurality of RR intervals wherein said signal sequence is obtained by monitoring the time intervals between successive heart beats of a patient'"'"'s heart by measuring at least one of electrical activity;
acoustic activity;
trans-thoracic impedance;
blood pressure;
blood velocity;
blood oxygenation;
heart movement and/or deformation;convert each RR interval in said sequence into an instantaneous heart rate value; sort said instantaneous heart rate values into ascending order; calculate differences between each of said sorted successive instantaneous heart rates; discard two largest differences generated in the previous step; and calculate a variability value by adding differences which were not discarded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A system for calculating a variability value that is indicative of AF using a sequence of NN intervals, wherein said system comprises a plurality of programmatic instructions that, when executed:
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obtain a signal sequence comprising a plurality of NN intervals wherein said signal sequence is obtained via monitoring the time intervals between successive heart beats of a patient'"'"'s heart by measuring and analyzing at least one of electrical activity;
acoustic activity;trans-thoracic impedance;
blood pressure;
blood velocity;
blood oxygenation;
heart movement and/or deformation;convert each NN interval in said sequence into an instantaneous heart rate value; sort said instantaneous heart rate values into ascending order; calculate differences between each of said sorted successive instantaneous heart rates; determine two largest differences of said calculated differences; discard said two largest differences, thereby leaving a plurality of retained differences; and calculate a variability value by adding the retained differences.
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Specification