Systems for processing electrocardiac signals having superimposed complexes
A system and a computed implemented methodology is disclosed for processing electrical signals recorded from the heart and, more particularly, for objectively deriving sub-components and comparing signals and their sub-components.
1. In an electrophysiology computer system, a processor configured to derive a non-synchronous subcomponent from a first heartbeat signal having a composite waveform which includes a synchronous subcomponent overlapping the non-synchronous subcomponent, by executing the steps of:
(a) selecting a synchronous subcomponent of a second heartbeat signal which corresponds to the synchronous subcomponent of the first heartbeat signal;
(b) permitting a user to mark a begin point and an end point of the selected synchronous subcomponent;
(c) defining a reference template as being a waveform segment between the marked begin and end points of the selected synchronous subcomponent;
(d) acquiring the composite waveform of the first heartbeat signal at the signal processing unit from multiple leads; and
(e) processing the composite waveform beat so as to derive the non-synchronous subcomponent;
wherein the selected synchronous subcomponent is from a single beat.
2. In an electrophysiology computer system, a processor configured to derive a non-synchronous subcomponent from a first heartbeat signal having a composite waveform which includes a synchronous subcomponent overlapping the non-synchronous subcomponent, by executing the steps of:
(a) selecting a synchronous subcomponent of a second heartbeat signal which corresponds to the synchronous subcomponent of the first heartbeat signal;
(b) permitting a user to mark a begin point and an end point of the selected synchronous subcomponent;
(c) defining a reference template as being a waveform segment between the marked begin and end points of the selected synchronous subcomponent;
(d) acquiring the composite waveform of the first heartbeat signal at the signal processing unit from multiple leads;
(e) processing the composite waveform beat so as to derive the non-synchronous subcomponent; and
(f) synchronizing the reference template and the composite waveform by aligning respective synchronous waveform segments thereof;
wherein the alignment is by using a correlation coefficient calculation on the acquired data to identify a best fit between the respective synchronous waveform segments; and the processor being configured to implement the additional step of permitting the person to shift the alignment thereby causing a change in the correlation coefficient calculation.
3. In an electrophysiology computer system, a processor configured to derive a non-synchronous subcomponent from a first heartbeat signal having a composite waveform which includes a synchronous subcomponent overlapping the non-synchronous subcomponent, by executing the steps of:
(a) selecting a synchronous subcomponent of a second heartbeat signal which corresponds to the synchronous subcomponent of the first heartbeat signal;
(b) permitting a user to mark a begin point and an end point of the selected synchronous subcomponent;
(c) defining a reference template as being a waveform segment between the marked begin and end points of the selected synchronous subcomponent;
(d) acquiring the composite waveform of the first heartbeat signal at the signal processing unit from multiple leads;
(e) processing the composite waveform beat so as to derive the non-synchronous subcomponent; and
(f) synchronizing the reference template and the composite waveform by aligning respective synchronous waveform segments thereof;
wherein the alignment is by using a correlation coefficient calculation on the acquired data to identify a best fit between the respective synchronous waveform segments; and the processor being configured to implement the additional step of permitting the person to shift the reference template to a waveform segment between corresponding begin and end points of a different heartbeat thereby causing a change in the correlation coefficient calculation.
4. In an electrophysiology computer system, a processor configured to derive a non-synchronous subcomponent from a first heartbeat signal having a composite waveform which includes a synchronous subcomponent overlapping the non-synchronous subcomponent, by executing the steps of:
(a) selecting a synchronous subcomponent of a second heartbeat signal which corresponds to the synchronous subcomponent of the first heartbeat signal;
(b) permitting a user to mark a begin point and an end point of the selected synchronous subcomponent;
(c) defining a reference template as being a waveform segment between the marked begin and end points of the selected synchronous subcomponent;
(d) acquiring the composite waveform of the first heartbeat signal at the signal processing unit from multiple leads; and
(e) processing the composite waveform beat so as to derive the non-synchronous subcomponent;
the processor being configured to implement the additional steps of: repeating the acquiring and processing steps so as to derive non-synchronous subcomponents from at least two different composite waveforms, and comparing the derived non-synchronous subcomponents to one another;
wherein the comparing step comprises performing a cross correlation waveform analysis.
5. In an electrophysiology computer system, a processor configured to derive a non-synchronous subcomponent from a first heartbeat signal having a composite waveform which includes a synchronous subcomponent overlapping the non-synchronous subcomponent, by executing the steps of:
(a) selecting a synchronous subcomponent of a second heartbeat signal which corresponds to the synchronous subcomponent of the first heartbeat signal;
(b) permitting a user to mark a begin point and an end point of the selected synchronous subcomponent;
(c) defining a reference template as being a waveform segment between the marked begin and end points of the selected synchronous subcomponent;
(d) acquiring the composite waveform of the first heartbeat signal at the signal processing unit from multiple leads; and
(e) processing the composite waveform beat so as to derive the non-synchronous subcomponent;
the processor being configured to implement the additional steps of: repeating the acquiring and processing steps so as to derive non-synchronous subcomponents from at least two different composite waveforms, and comparing the derived non-synchronous subcomponents to one another the processor being configured to implement the additional step of selectively indicating on an output device a quality of a match as a function of the comparing step to thereby provide an indicator as to whether the derived non-synchronous subcomponents have the same focal origin.
6. In an electrophysiology computer system, a processor configured to derive a non-synchronous subcomponent from a first heartbeat signal having a composite waveform which includes a synchronous subcomponent overlapping the non-synchronous subcomponent, by executing the steps of:
(a) selecting a synchronous subcomponent of a second heartbeat signal which corresponds to the synchronous subcomponent of the first heartbeat signal;
(b) permitting a user to mark a begin point and an end point of the selected synchronous subcomponent;
(c) defining a reference template as being a waveform segment between the marked begin and end points of the selected synchronous subcomponent;
(d) acquiring the composite waveform of the first heartbeat signal at the signal processing unit from multiple leads; and
(e) processing the composite waveform beat so as to derive the non-synchronous subcomponent;
the processor being configured to implement the additional steps of comparing the derived non-synchronous subcomponent to a library of non-synchronous subcomponents of known focal origin, and predicting the most likely site of the origin as a function of the comparison.
7. In an electrophysiology computer system, a processor configured to derive a non-synchronous subcomponent from a first heartbeat signal having a composite waveform which includes a synchronous subcomponent overlapping the non-synchronous subcomponent, by executing the steps of:
(a) selecting a synchronous subcomponent of a second heartbeat signal which corresponds to the synchronous subcomponent of the first heartbeat signal;
(b) permitting a user to mark a begin point and an end point of the selected synchronous subcomponent;
(c) defining a reference template as being a waveform segment between the marked begin and end points of the selected synchronous subcomponent;
(d) acquiring the composite waveform of the first heartbeat signal at the signal processing unit from multiple leads; and
(e) processing the composite waveform beat so as to derive the non-synchronous subcomponent;
wherein the derived non-synchronous subcomponent is a derived, spontaneous non-synchronous subcomponent, the processor being configured to implement the additional steps of maneuvering a pace mapping catheter within or adjacent the atria while pacing the heart, and repeating the acquiring and processing steps so as to derive a paced non-synchronous subcomponent until such time that the derived paced and spontaneous subcomponents correlate with one another within a prescribed criterion.
8. In an electrophysiology computer system, a processor configured to derive a non-synchronous subcomponent from a first heartbeat signal having a composite waveform which includes a synchronous subcomponent overlapping the non-synchronous subcomponent, by executing the steps of:
(a) selecting a synchronous subcomponent of a second heartbeat signal which corresponds to the synchronous subcomponent of the first heartbeat signal;
(b) permitting a user to mark a begin point and an end point of the selected synchronous subcomponent;
(c) defining a reference template as being a waveform segment between the marked begin and end points of the selected synchronous subcomponent;
(d) acquiring the composite waveform of the first heartbeat signal at the signal processing unit from multiple leads; and
(e) processing the composite waveform beat so as to derive the non-synchronous subcomponent;
the processor being configured to implement the additional step of determining an integral value of the area of the derived non-synchronous subcomponent.
9. The processor of claim 8 , the processor being configured to implement the additional step of normalizing the integral value over a length of the derived non-synchronous subcomponent.
10. In an electrophysiology computer system, a processor configured to derive a non-synchronous subcomponent from a first heartbeat signal having a composite waveform which includes a synchronous subcomponent overlapping the non-synchronous subcomponent, by executing the steps of:
(a) selecting a synchronous subcomponent of a second heartbeat signal which corresponds to the synchronous subcomponent of the first heartbeat signal;
(b) permitting a user to mark a begin point and an end point of the selected synchronous subcomponent;
(c) defining a reference template as being a waveform segment between the marked begin and end points of the selected synchronous subcomponent;
(d) acquiring the composite waveform of the first heartbeat signal at the signal processing unit from multiple leads; and
(e) processing the composite waveform beat so as to derive the non-synchronous subcomponent;
the processor being configured to implement the additional steps of comparing the derived non-synchronous subcomponent to a library of non-synchronous subcomponents of known focal origin, the derived non-synchronous subcomponent being a spontaneous non-synchronous subcomponent; predicting the most likely site of the origin as a function of the comparison; maneuvering a pace mapping catheter within or adjacent the heart while pacing the heart in real-time; repeating the acquiring and processing steps so as to derive a paced non-synchronous subcomponent until such time that the derived, paced and spontaneous subcomponents correlate with one another within a prescribed criterion.