Prioritized rule based method and apparatus for diagnosis and treatment of arrhythmias
First Claim
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1. A rule-based cardiac arrhythmia detection software system, comprising:
- a set of parameters defining a plurality of hierarchical cardiac event pattern code rules, each of said pattern code rules prescribing criteria corresponding to a specific type of cardiac rhythm;
an instruction set for storing information regarding each occurrence of a cardiac event according to type;
an instruction set that computes time-based features for each occurrence of the cardiac event;
an instruction set that computes a pattern code for each occurrence of the cardiac event which is based at least in part on the computed time-based features;
an instruction set that computes counts of adherence based on the computed pattern code;
an instruction set that applies the pattern code rules to the computed counts of adherence to determine a positive or a negative compliance status with any of said pattern code rules;
an instruction set that selects a highest priority rule that is determined to have a positive compliance status; and
an instruction set that provides an output indication of the specific type of cardiac rhythm corresponding to the selected highest priority rule.
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Abstract
An implantable antiarrhythmia device which detects and classifies arrhythmias of the human heart, and delivers appropriate therapy. The device employs a method of arrhythmia classification based on a set of prioritized rules, each of the rules defining a plurality of criteria based upon characteristics of sensed depolarizations of heart tissue, each rule being met when the criteria associated with the rule are met. Some rules, when met, trigger delivery of antiarrhythmia therapy. Other rules, when met, inhibit delivery of antiarrhythmia therapy. The rules may be met simultaneously, and if so, the highest priority rule governs the behavior of the device.
310 Citations
13 Claims
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1. A rule-based cardiac arrhythmia detection software system, comprising:
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a set of parameters defining a plurality of hierarchical cardiac event pattern code rules, each of said pattern code rules prescribing criteria corresponding to a specific type of cardiac rhythm;
an instruction set for storing information regarding each occurrence of a cardiac event according to type;
an instruction set that computes time-based features for each occurrence of the cardiac event;
an instruction set that computes a pattern code for each occurrence of the cardiac event which is based at least in part on the computed time-based features;
an instruction set that computes counts of adherence based on the computed pattern code;
an instruction set that applies the pattern code rules to the computed counts of adherence to determine a positive or a negative compliance status with any of said pattern code rules;
an instruction set that selects a highest priority rule that is determined to have a positive compliance status; and
an instruction set that provides an output indication of the specific type of cardiac rhythm corresponding to the selected highest priority rule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
the number of at least one atrial event during the R—
R interval,a duration of the P-R interval associated with the R—
R interval, anda duration of the R-P interval associated with the R—
R interval.
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10. A system of claim 9,
wherein the number of at least one atrial event during the R— - R interval constitutes a P count,
wherein the R-P interval is the time in milliseconds from the beginning of a ventricular event in the R—
R interval to a first of the at least one atrial event within the R—
R interval, andwherein the P-R interval is the time in milliseconds from a last one of said at least one atrial event in the R—
R interval to the first of the at least one atrial event within the R—
R interval to a concluding ventricular event in the R—
R interval.
- R interval constitutes a P count,
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11. A system of claim 10 wherein a beat count of between zero to nine is generated by the instruction set that computes time-based features based on the P count and a recorded event time of the at least one atrial event.
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12. A system of claim 2, further comprising:
an instruction set that counts a number of uninterrupted atrial events after a prior ventricular event and that then counts a number of uninterrupted ventricular events after a last atrial event, all according to said pattern code rules.
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13. A system of claim 1 wherein the cardiac event pattern code rules specify said specific type of cardiac rhythm including:
- a ventricular fibrillation type, a fast ventricular tachycardia type, a ventricular tachycardia type, a simultaneous ventricular and supraventricular tachycardia type, an atrial fibrillation type, an atrial flutter type, a sinus tachycardia type, an AV nodal re-entrant tachycardia type, and a normal sinus rhythm type.
Specification