Cardiac event detection over varying time scale
First Claim
1. A system for tracking the cardiovascular condition of a human patient the system including:
- at least two electrodes positioned to sense the electrical signal from the patient'"'"'s heart, the electrical signal consisting of a multiplicity of beats;
a histogram memory including memory capacity to store at least one histogram, the at least one histogram including at least two bins, each bin being a counter; and
a processor to compute the amplitude of the ST segment of the electrical signal for at least a portion of the multiplicity of beats, each beat of the portion of the multiplicity of beats that is processed being a processed beat, the processor also being designed to compute the R-R interval for each processed beat, the processor further being designed increment one of the at least two bins of the at least one histogram where the choice of bin to be incremented is dependent on the computed amplitude of the ST segment for one or more processed beats, the histogram only being incremented when a computed R-R interval associated with the one or more of the processed beats is within a particular heart rate range, any histogram stored in the histogram memory being incremented by the processor only for a data collection time period.
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Accused Products
Abstract
Disclosed is a “tracker system” that includes implanted electrical leads which are part of an implanted cardiotracker plus external equipment that includes external alarm means and a physician'"'"'s programmer. The tracker system is designed to monitor the degradation of a patient'"'"'s cardiovascular condition from one or more causes. These causes include the rejection of a transplanted heart and/or the progression of a stenosis in a coronary artery. As one or more stenoses in a coronary artery become progressively more narrow thereby causing reduced blood flow to the heart muscle coronary circulation, the tracker system can alert the patient by either or both internal and/or external alarm means to take the appropriate medical action. The physician'"'"'s programmer can be used to display histograms of key heart signal parameters that are indicative of the patient'"'"'s cardiovascular condition.
37 Citations
19 Claims
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1. A system for tracking the cardiovascular condition of a human patient the system including:
- at least two electrodes positioned to sense the electrical signal from the patient'"'"'s heart, the electrical signal consisting of a multiplicity of beats;
a histogram memory including memory capacity to store at least one histogram, the at least one histogram including at least two bins, each bin being a counter; and
a processor to compute the amplitude of the ST segment of the electrical signal for at least a portion of the multiplicity of beats, each beat of the portion of the multiplicity of beats that is processed being a processed beat, the processor also being designed to compute the R-R interval for each processed beat, the processor further being designed increment one of the at least two bins of the at least one histogram where the choice of bin to be incremented is dependent on the computed amplitude of the ST segment for one or more processed beats, the histogram only being incremented when a computed R-R interval associated with the one or more of the processed beats is within a particular heart rate range, any histogram stored in the histogram memory being incremented by the processor only for a data collection time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- at least two electrodes positioned to sense the electrical signal from the patient'"'"'s heart, the electrical signal consisting of a multiplicity of beats;
Specification