Back to results
US 6,266,554 B1Granted
System and method for classifying cardiac complexes
AssigneeCardiac Pacemakers, Inc.
InventorsWilliam Hsu, Joseph Martin Smith
Life of this patent
Estimating the term…
Abstract
A system and a method for classifying cardiac complexes based on cardiac information derived from two or more cardiac signals. Two or more cardiac signals containing cardiac complexes are monitored. A cardiac complex in the two or more cardiac signals is isolated in an analysis window. The morphology of the cardiac complex in each of the two or more cardiac signals is then compared to the morphology of a template cardiac complex representing a predetermined cardiac condition. Based on this comparison, the cardiac complex is classified as either belonging or not belonging to the predetermined cardiac condition.
Claims50
A method, comprising:
- monitoring a first signal and a second signal representative of electrical cardiac activity;
- detecting a cardiac complex in each of the first signal and the second signal;
- analyzing at least the first signal to detect a tachycardia episode;
- when the tachycardia episode is detected, detecting the cardiac complex in the first signal and the second signal;
- locating a predetermined feature in the cardiac complex detected in the first signal and a first NSR representative complex, wherein the predetermined feature includes a repeatably identifiable complex section common to the cardiac complex detected in the first signal and the first NSR representative complex;
- aligning the predetermined feature in the cardiac complex detected in the first signal and the first NSR representative complex;
- comparing the cardiac complex detected in the second signal to a second NSR representative complex;
- and
- classifying the cardiac complex as an arrhythmic cardiac complex based on the comparison of the morphology of the cardiac complex in the second cardiac signal to the second NSR representative complex.
6 more elements
A method, comprising:
- monitoring two or more cardiac signals representative of electrical cardiac activity;
- detecting a cardiac complex in each of the two or more cardiac signals;
- locating at least one predetermined feature in the cardiac complex for each of the two or more cardiac signals, wherein the at least one predetermined feature includes a repeatably identifiable complex portion;
- generating a scalar value as a function of a position of the at least one predetermined feature for each of the two or more cardiac signals;
- using the scalar values to create a cardiac vector, where the cardiac vector represents the cardiac complex comparing the cardiac vector to one or more classification vectors, where each of the one or more classification vectors represents a predetermined cardiac condition;
- determining a similarity coefficient from each comparison of the cardiac vector and the one or more classification vectors;
- and
- classifying the cardiac complex as the predetermined cardiac condition when the cardiac complex similarity coefficient exceed a predetermined threshold.
5 more elements
A method, comprising:
- monitoring a first cardiac signal and a second cardiac signal;
- detecting a cardiac complex in each of the first cardiac signal and the second cardiac signal;
- comparing the morphology of the cardiac complex in the first cardiac signal to a first template morphology and comparing the morphology of the cardiac complex in the second cardiac signal to a second template morphology;
- and
- classifying the cardiac complex as one of a predetermined arrhythmic complex based on the comparison of the morphology of the cardiac complex in the first cardiac signal and the second cardiac signal to the first template morphology and the second template morphology.
2 more elements
A system, comprising:
- at least one catheter having at least a first cardiac electrode and a second cardiac electrode;
- a sensing system attached to the first cardiac electrode and the second cardiac electrode, wherein the sensing system senses a first signal and a second signal representative of electrical cardiac activity;
- a morphology analyzer circuit coupled to the sensing system, wherein the morphology analyzer circuit locates a position of at least one predetermined feature in the morphology of the cardiac complex in the first signal and the second signal and generates two or more scalar values as a function of the position of the at least one predetermined feature for each of the first signal and the second signal;
- a template generator coupled to the morphology analyzer, wherein the template generator circuit creates a cardiac complex vector from the two or more scalar values generated by morphology analyzer circuit;
- and
- a signal feature comparison circuit coupled to the morphology analyzer circuit and the template generator circuit, wherein the signal feature comparison circuit compares the cardiac complex vector to one or more classification vectors to classify the cardiac complex.
3 more elements
A system, comprising:
- at least one catheter having at least a first cardiac electrode and a second cardiac electrode;
- a sensing system attached to the first cardiac electrode and the second cardiac electrode, wherein the sensing system senses a first signal and a second signal representative of electrical cardiac activity;
- a template generator circuit coupled to the sensing system, wherein the template generator circuit determines a first NSR representative complex and a second NSR representative complex from a plurality cardiac complexes sensed during normal sinus rhythm;
- a morphology analyzer circuit coupled to the sensing system, where the morphology analyzer circuit locates a predetermined feature in a cardiac complex detected in the first signal and in the first NSR representative complex, wherein the predetermined feature includes a repeatably identifiable complex section common to the cardiac complex detected in the first signal and the first NSR representative complex;
- and
- a signal feature comparison circuit coupled to the morphology analyzer circuit and the template generator circuit, where the signal feature comparison circuit aligns the predetermined feature in the cardiac complex monitored in the first signal with the predetermined feature on the first NSR representative complex and compares the cardiac complex monitored in the second signal to the second NSR representative complex to determine whether the cardiac complex is an arrhythmic complex.
3 more elements
Dependencies are inferred from the claim text.