Methods for processing electrocardiac signals having superimposed complexes
First Claim
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1. A method for locating an ectopic beat during pace-mapping with a roving catheter, comprising the steps of:
- (a) eliciting at least first and second paced signals from respective first and second locations of the roving catheter;
(b) using a correlation coefficient calculation on the elicited first and second paced signals to identify a best fit between a reference template and each of the first and second paced signals; and
(c) simultaneously displaying on a display the best fit for each of the first and second paced signals.
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Abstract
Computer implemented methods and associated systems are disclosed for processing electrical signals recorded from the heart and, more particularly, for objectively deriving sub-components and comparing signals and their sub-components.
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Citations
30 Claims
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1. A method for locating an ectopic beat during pace-mapping with a roving catheter, comprising the steps of:
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(a) eliciting at least first and second paced signals from respective first and second locations of the roving catheter;
(b) using a correlation coefficient calculation on the elicited first and second paced signals to identify a best fit between a reference template and each of the first and second paced signals; and
(c) simultaneously displaying on a display the best fit for each of the first and second paced signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for tracking ectopic beats through template matching, comprising the steps of:
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(a) establishing a reference template over an interval of a first ECG signal;
(b) monitoring a data signal for a triggering event;
(c) initiating an offset period in response to the triggering event; and
(d) after the offset period has elapsed, using a correlation coefficient calculation on the data signal to identify a best fit between the reference template and the data signal over the interval. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for identifying multiple distinct arrhythmias comprising the steps of:
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(a) acquiring a first arrhythmia signal within a sinus rhythm;
(b) defining the first arrhythmia signal as a first template;
(c) acquiring a second arrhythmia signal;
(d) correlating the first template and the second arrhythmia signal;
(e) identifying the second arrhythmia signal as a second, distinct arrhythmia if the correlation fails prescribed criteria.
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18. A method for identifying multiple distinct arrhythmias comprising the steps of:
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(a) acquiring a first arrhythmia signal;
(b) defining the first arrhythmia signal as a first template;
(c) acquiring a second arrhythmia signal;
(d) correlating the first template and the second arrhythmia signal;
(e) identifying the second arrhythmia signal as a second, distinct arrhythmia if the correlation fails prescribed criteria wherein greater than two arrhythmia signals are present, and comprise a set of templates, the method further comprising the steps of;
(f) defining the second, distinct arrhythmia as a second template;
(g) acquiring an additional arrhythmia signal;
(h) sequentially correlating the additional arrhythmia signal to each template in the set of templates;
(i) identifying the additional arrhythmia signal as a distinct arrhythmia signal if the correlation fails prescribed criteria;
(j) defining the additional distinct arrhythmia signal as an additional template and repeating steps (f)-(j) until no additional arrhythmia signals remain that fail the prescribed criteria. - View Dependent Claims (19, 20, 21)
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22. A method for deriving a p-wave signal from a premature atrial contraction (“
- PAC”
) beat to assist a person in diagnosing a heart, comprising the steps of;(a) selecting a QRS-T segment of a reference ECG signal;
(b) permitting a user to mark a begin a point and an end point of the selected segment of the reference ECG signal;
(c) defining a reference template as being a waveform segment between the marked begin and end points of the selected segment of the reference ECG signal;
(d) acquiring the PAC beat at the signal processing unit from multiple leads;
(e) processing the PAC beat so as to derive the p-wave signal, wherein the derived p-wave is a derived, spontaneous p-wave template;
(f) maneuvering a pace mapping catheter within or adjacent the atria while pacing the heart while repeating the acquiring and processing steps so as to derive a paced p-wave; and
(g) comparing the derived, paced p- wave to the derived, spontaneous p-wave using a correlation coefficient to identify a best fit between the derived, spontaneous p-wave template and the derived, paced p-wave. - View Dependent Claims (23, 24)
- PAC”
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25. A method for determining a most likely site of origin of a spontaneous P-wave comprising:
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(a) defining a spontaneous P-wave as a template;
(b) maneuvering a pace mapping catheter within or adjacent the atria (c) pacing at a location in or adjacent the atria using a pace-mapping catheter;
(d) acquiring a paced P-wave signal from the pace-mapping catheter;
(e) comparing the spontaneous P-wave template to the paced P-wave signal; and
(f) repeating steps (b), (c), (d), and (e) until such time that the spontaneous P-wave template and the paced P-wave signal correlate with one another within a prescribed criterion. - View Dependent Claims (26, 27)
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28. A method for tracking ectopic beats through template matching, comprising the steps of:
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(a) capturing a first ECG signal in a signal processing unit;
(b) permitting a user to mark a begin point and an end point of the captured first ECG signal;
(c) defining a reference template as being a waveform segment between the marked begin and end points of the first ECG signal;
(d) acquiring data at the signal processing unit; and
(e) using a correlation coefficient calculation on the acquired data to identify a best fit between the reference template and the acquired data;
wherein the defining step comprises defining the reference template as a set of waveform segments that are obtained from a plurality of electrocardiac leads between marked begin and end points. - View Dependent Claims (29, 30)
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Specification