Reconstruction of a Surface Electrocardiogram From Far Field Signals Extracted of an Endocardial Electrogram
First Claim
1. A device for processing signals representative of a cardiac potential of depolarization of the myocardium, comprising:
- means for collecting a ventricular EGM signal (EGMV) and an atrial EGM signal (EGMA);
means for extracting a ventricular far field signal component(FFV) from the collected ventricular EGM signal (EGMV) and an atrial far field signal component(FFA) from the collected atrial EGM signal (EGMA); and
means for reconstructing a surface electrocardiogram (ECG) from the ventricular far field signal component and the atrial far field signal component, and delivering an output signal of a reconstructed surface electrocardiogram (ECGj*), wherein;
the means for extracting the ventricular far field signal component and the atrial far field signal component comprises, for each of a ventricular derivation and an atrial derivation;
means (22, 28) for detecting a spontaneous or stimulated (P, R) depolarization wave, receiving as an input the EGM signal and delivering as an output a corresponding pulse signal;
a near field estimator filter (24, 30), receiving as an input the pulse signal and delivering as an output a near field signal component (NFA, NFV); and
means (26, 32) for subtracting from the EGM signal (EGMA, EGMV) the near field signal component (NFA, NFV) and for delivering as an output said far field signal component (FFA, FFV); and
the means for reconstructing an ECG include;
a ventricular far field estimator filter (18), receiving as an input said ventricular far field component signal and delivering as an output a filtered ventricular far field signal component;
an atrial far field estimator filter (16), receiving as input said atrial far field signal component and delivering as an output a filtered atrial far field signal component; and
an adder (20) adding the filtered ventricular and atrial far field signal components and delivering as output said reconstructed surface electrocardiogram signal.
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Abstract
Reconstruction of a surface electrocardiogram from far field signals extracted from an endocardial electrogram in an active medical device is disclosed. The device collects a ventricular EGM signal (EGMV) and an atrial EGM signal (EGMA), and extracts a ventricular far field signal component (FFV) and an atrial far field signal component (FFA). The ventricular and atrial far field signal components are combined to deliver as an output a reconstructed surface electrogram ECG signal (ECGj*). The ventricular and atrial far field signals are respectively extracted from the collected ventricular and atrial EGM signals (FFV, FFA). The reconstruction of the ECG is operated by ventricular (18) and atrial (16) far field signal estimator filters. According to one embodiment, the far field signal estimator filters are linear or nonlinear filters, receiving as input the far field signal components. An adder (20) adds the filtered signals and delivers as output the reconstructed ECG signal (ECGj*).
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Citations
11 Claims
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1. A device for processing signals representative of a cardiac potential of depolarization of the myocardium, comprising:
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means for collecting a ventricular EGM signal (EGMV) and an atrial EGM signal (EGMA); means for extracting a ventricular far field signal component(FFV) from the collected ventricular EGM signal (EGMV) and an atrial far field signal component(FFA) from the collected atrial EGM signal (EGMA); and means for reconstructing a surface electrocardiogram (ECG) from the ventricular far field signal component and the atrial far field signal component, and delivering an output signal of a reconstructed surface electrocardiogram (ECGj*), wherein; the means for extracting the ventricular far field signal component and the atrial far field signal component comprises, for each of a ventricular derivation and an atrial derivation; means (22, 28) for detecting a spontaneous or stimulated (P, R) depolarization wave, receiving as an input the EGM signal and delivering as an output a corresponding pulse signal; a near field estimator filter (24, 30), receiving as an input the pulse signal and delivering as an output a near field signal component (NFA, NFV); and means (26, 32) for subtracting from the EGM signal (EGMA, EGMV) the near field signal component (NFA, NFV) and for delivering as an output said far field signal component (FFA, FFV); and the means for reconstructing an ECG include; a ventricular far field estimator filter (18), receiving as an input said ventricular far field component signal and delivering as an output a filtered ventricular far field signal component; an atrial far field estimator filter (16), receiving as input said atrial far field signal component and delivering as an output a filtered atrial far field signal component; and an adder (20) adding the filtered ventricular and atrial far field signal components and delivering as output said reconstructed surface electrocardiogram signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification