Reduced electrode electrocardiography system
First Claim
1. A method of synthesizing electrocardiographic (ECG) signals comprising receiving signals from a first group of electrodes connected to predetermined locations on a human body to acquire a first set of ECG signals and deriving at least one further ECG signal using predetermined transformation(s) on said first set of ECG signals or a subset thereof to form a desired set of signals, wherein the first group of electrodes comprises standard 12 lead electrode site V5, standard 12 lead electrode site V2 replaced by an electrode position Vc, which is defined to be on the sternum directly between the standard electrode sites V1 and V2, at least one electrode positioned substantially level with V5 on the right anterior axillary line, and at least one further electrode positioned on each of the right hand side and left hand side of the body, wherein said ECG signals are synthesized from data obtained from less than ten electrode sites.
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Abstract
Electrocardio-graphic (ECG) signals such as the standard 12-lead are synthesized from a novel reduced electrode set. Signals are received from a group of electrodes connected to predetermined locations on a human body, and deriving at least one further ECG signal using predetermined transformation(s) (130) on said first set of ECG signals. This forms a desired set of signals. The group of electrodes may comprise the standard 12 lead electrode sites V2 and V5 plus one electrode positioned substantially level with V5 on the right anterior axillary line, and a further electrode on each of the right hand side and left hand side of the body. In an alternative arrangement the electrode position V2 is replaced by an electrode position Vc on the sternum directly between the standard electrode sites V1 and V2. Also disclosed is a method of improving accuracy of synthesized signals by detecting body posture and modifying the transformations.
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Citations
40 Claims
- 1. A method of synthesizing electrocardiographic (ECG) signals comprising receiving signals from a first group of electrodes connected to predetermined locations on a human body to acquire a first set of ECG signals and deriving at least one further ECG signal using predetermined transformation(s) on said first set of ECG signals or a subset thereof to form a desired set of signals, wherein the first group of electrodes comprises standard 12 lead electrode site V5, standard 12 lead electrode site V2 replaced by an electrode position Vc, which is defined to be on the sternum directly between the standard electrode sites V1 and V2, at least one electrode positioned substantially level with V5 on the right anterior axillary line, and at least one further electrode positioned on each of the right hand side and left hand side of the body, wherein said ECG signals are synthesized from data obtained from less than ten electrode sites.
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14. A method for obtaining a set of electrocardiographic (ECG) signals of the general type comprising synthesizing ECG signals by receiving signals from a first group of electrodes connected to predetermined locations on a human body to acquire a first set of ECG signals and deriving at least one further ECG signal using predetermined transformation(s) on said first set of ECG signals or a subset thereof to form a desired set of signals, wherein said first group includes at least electrodes located at the following sites:
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R and L;
placed on or near the right and left upper limbs respectively; andVc;
placed on the sternum wherein site Vc is located on the sternum directly between the standard electrode sites V1 and V2. - View Dependent Claims (15, 16, 17, 18, 37, 38)
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19. A method for obtaining a set of ECG signals of the general type comprising synthesizing electrocardiographic (ECG) signals by receiving signals from a first group of electrodes connected to predetermined locations on a human body to acquire a first set of ECG signals and deriving at least one further ECG signal using predetermined transformation(s) on said first set of ECG signals or a subset thereof to form a desired set of signals, wherein said first group includes at least electrodes located at the following sites:
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Vm;
one of the standard 12 lead electrode sites V4, V5 and V6 (m=4, 5 or
6);VnR;
level with one of the standard electrode sites V4, V5 and V6 (n=4, 5 or
6) on the right midclavicular line, right anterior axillary line or right midaxilliary line respectively; andVc;
placed on the sternum, wherein Vc is be located directly between the standard electrode sites V1 and V2. - View Dependent Claims (20, 21, 39, 40)
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29. A method of synthesizing electrocardiographic (ECG) signals comprising a) receiving signals from a first group of electrodes connected to predetermined locations on a human body to acquire a first set of ECG signals, b) deriving at least one further ECG signal using predetermined transformation(s) on said first set of ECG signals or a subset thereof to form a desired set of signals, wherein the first group of electrodes comprises the standard 12 lead electrode sites V2 and V5 plus at least one electrode positioned substantially level with V5 on the right anterior axillary line, and at least one further electrode positioned on each of the right hand side and left hand side of the body, c) deriving an ECG signal from a temporary electrode that is not connected for the full duration the ECG measurement, and d) defining a reference potential for each temporary electrode from one of the following options:
- the electrical potential of an ECG electrode;
the electrical potential of a different temporary electrode or a potential formed by a combination of ECG electrode(s) and/or temporary electrode(s).
- the electrical potential of an ECG electrode;
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30. A method of synthesizing electrocardiographic (ECG) signals comprising a) receiving signals from a first group of electrodes connected to predetermined locations on a human body to acquire a first set of ECG signals, b) deriving at least one further ECG signal using predetermined transformation(s) on said first set of ECG signals or a subset thereof to form a desired set of signals, wherein the first group of electrodes comprises the standard 12 lead electrode sites V2 and V5 plus at least one electrode positioned substantially level with V5 on the right anterior axillary line, and at least one further electrode positioned on each of the right hand side and left hand side of the body, and c) deriving an ECG signal from a temporary electrode that is not connected for the full duration the ECG measurement, wherein at least one temporary electrode is located at any point on the right arm, shoulder or hand.
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31. A method of synthesizing electrocardiographic (ECG) signals comprising a) receiving signals from a first group of electrodes connected to predetermined locations on a human body to acquire a first set of ECG signals, b) deriving at least one further ECG signal using predetermined transformation(s) on said first set of ECG signals or a subset thereof to form a desired set of signals, wherein the first group of electrodes comprises the standard 12 lead electrode sites V2 and V5 plus at least one electrode positioned substantially level with V5 on the right anterior axillary line, and at least one further electrode positioned on each of the right hand side and left hand side of the body, and c) deriving an ECG signal from a temporary electrode that is not connected for the full duration the ECG measurement, wherein at least one temporary electrode is located at any point on the left arm, shoulder or hand.
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32. A method of synthesizing electrocardiographic (ECG) signals comprising a) receiving signals from a first group of electrodes connected to predetermined locations on a human body to acquire a first set of ECG signals, b) deriving at least one further ECG signal using predetermined transformation(s) on said first set of ECG signals or a subset thereof to form a desired set of signals, wherein the first group of electrodes comprises the standard 12 lead electrode sites V2 and V5 plus at least one electrode positioned substantially level with V5 on the right anterior axillary line, and at least one further electrode positioned on each of the right hand side and left hand side of the body, and c) deriving an ECG signal from a temporary electrode that is not connected for the full duration the ECG measurement, wherein the temporary electrode(s) are connected at a different time from when the first set of ECG signals is acquired, or equivalently, activated temporarily, and the subject-specific transformations retrospectively calculated.
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33. A method of synthesizing electrocardiographic (ECG) signals comprising a) receiving signals from a first group of electrodes connected to predetermined locations on a human body to acquire a first set of ECG signals, b) deriving at least one further ECG signal using predetermined transformation(s) on said first set of ECG signals or a subset thereof to form a desired set of signals, wherein the first group of electrodes comprises the standard 12 lead electrode sites V2 and V5 plus at least one electrode positioned substantially level with V5 on the right anterior axillary line, and at least one further electrode positioned on each of the right hand side and left hand side of the body, and c) deriving an ECG signal from a temporary electrode that is not connected for the full duration the ECG measurement, wherein a temporary electrode, after initial use, is used to perform functions other than that of supplying electrocardiogram signal data.
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34. A method of synthesizing electrocardiographic (ECG) signals comprising a) receiving signals from a first group of electrodes connected to predetermined locations on a human body to acquire a first set of ECG signals, b) deriving at least one further ECG signal using predetermined transformation(s) on said first set of ECG signals or a subset thereof to form a desired set of signals, wherein the first group of electrodes comprises the standard 12 lead electrode sites V2 and V5 plus at least one electrode positioned substantially level with V5 on the right anterior axillary line, and at least one further electrode positioned on each of the right hand side and left hand side of the body, and c) deriving an ECG signal from a temporary electrode that is not connected for the full duration the ECG measurement, wherein an input connection to a measurement means or device used to obtain a signal from an ECG electrode(s) has a secondary use to obtain a signal from a temporary electrode.
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35. A method of synthesizing electrocardiographic (ECG) signals comprising a) receiving signals from a first group of electrodes connected to predetermined locations on a human body to acquire a first set of ECG signals, b) deriving at least one further ECG signal using predetermined transformation(s) on said first set of ECG signals or a subset thereof to form a desired set of signals, wherein the first group of electrodes comprises the standard 12 lead electrode sites V2 and V5 plus at least one electrode positioned substantially level with V5 on the right anterior axillary line, and at least one further electrode positioned on each of the right hand side and left hand side of the body, wherein said ECG signals are synthesized from data obtained from less than ten electrode sites, and c) switching an electrode between separate modes of operation wherein in a first mode, the electrode measures an ECG signal and in a second mode, the electrode forms a reference electrical connection between a subject and an ECG measurement means.
Specification