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Electrocardiograph device having additional lead function and method for obtaining additional-lead electrocardiogram

a technology of electrocardiogram and lead electrode, which is applied in the field of electrocardiograph with an extended lead function and extended lead electrocardiogram (ecg), can solve the problems of difficulty in obtaining multiple lead waveforms, low sensitivity of ecg waveforms to reflect the effect of coronary artery occlusion on ecg waveform, and low sensitivity of the right lateral wall of the heart muscle, so as to achieve easy to obtain an extended lead. , th

Inactive Publication Date: 2006-10-19
THE UNIV OF AIZU PUBLIC UNIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides an electrocardiograph with an extended lead function that can easily obtain an extended lead without needing to mount an additional electrode. This is achieved by measuring lead potentials of a standard 12-lead ECG and calculating an extended lead potential based on the measured lead potentials and a heart vector determined from the lead potentials. The extended lead potential can also be obtained by performing an extended lead ECG deriving method using a potential detector and calculating the extended lead potential based on the measured lead potentials and transfer coefficients. The invention provides a more convenient and efficient way to obtain an extended lead ECG, which can be useful in various medical applications."

Problems solved by technology

However, for example, in cases of home and emergency medical cares, it is often the case that there is no extra room for use of many electrodes and attachment of each electrode at the appropriate position on the body surface of the living body in view of the patient's condition.
Furthermore, it is sometimes difficult to transmit signals of multiple channels for acquisition of many lead waveforms.
On the contrary, if an occlusion of the coronary artery occurs at the posterior wall of the heart muscle, the electrode mounted locations are far from the posterior wall and the sensitivity of the ECG waveforms is thus too low to reflect the effect of the occlusion of the coronary artery on the ECG waveforms.
In addition, the sensitivity to the right lateral wall of the heart muscle is also low because most of the electrode mounted positions of the standard 12-lead ECG are on the left side of the body surface.
In addition, there also arises a problem that the electrode mounting operation is complicated.

Method used

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  • Electrocardiograph device having additional lead function and method for obtaining additional-lead electrocardiogram
  • Electrocardiograph device having additional lead function and method for obtaining additional-lead electrocardiogram
  • Electrocardiograph device having additional lead function and method for obtaining additional-lead electrocardiogram

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first embodiment

[0045] The first embodiment concerns a method and apparatus for making use of ECG signals measured at the electrode mounted locations of the standard 12-lead ECG by a potential detector of a standard 12-lead electrocardiograph, to perform an arithmetic operation to calculate, for example, extended leads including Leads V7, V8, and V9 at electrode mounted locations on extensions of the chest leads and Leads V3R, V4R, and V5R.

[0046] Namely, the first embodiment is to calculate the extended leads V7, V8, V9 and V3R, V4R, V5R, for example, from the eight ECG signals (I, II, V1, V2, V3, V4, V5, and V6) obtained by the standard 12-lead electrocardiograph, in order to calculate the heart potentials at the extended lead locations (ECG) from the ECG signals obtained by the potential detector of the 12-lead electrocardiograph.

(Principle of Method of Deriving Extended Lead ECG Using Lead Vectors)

[0047] In the clinical ECG, according to the lead theory, the cardiac source at an arbitrary ti...

second embodiment

[0070] The second embodiment will be described below. The second embodiment is different from the first embodiment in that the extended lead ECG (Leads V7, V8, V9, V3R, V4R, and V5R) is derived by use of the lead vectors, instead of the transfer coefficients α.

(Principle of Method of Deriving Extended Lead ECG Using Lead Vectors)

[0071] The principle of the method of deriving the extended lead ECG according to the second embodiment is as described below. In the clinical ECG, according to the lead theory, the cardiac source at an arbitrary time can be expressed by a Fixed Single Dipole, as described above, and a potential (V) at an arbitrary lead location can be determined by Eqs (2-1) to (2-3) below. V=L·H(2⁢-⁢1)H=(hxhyhz)(2⁢-⁢2)L=(lxlylz)(2⁢-⁢3)

[0072] In the above equations, V represents the potential, H the heart vector, and L a lead vector.

[0073] When the measured lead potentials of the standard 12-lead ECG are applied to Eq (2-1), Eq (2-4) below results. (LITLIITL1TL2TL3TL4...

third embodiment

[0081] In view of the invention in Patent Document 1 by the Inventor, Leads I and II of the limb leads and the two leads of Leads V2 and V4 of the chest leads in the standard 12-lead ECG are used as the subset of the lead system consisting of the minimum number of channels, for example, with the potential detector consisting of six electrodes to determine (1) Lead III and Leads aV (Lead aVR, Lead aVL, and Lead aVF) by the arithmetic operation based on the characteristic relationship among the leads presented in [Table 1] above. In addition, (2) the rest leads of the chest leads, Leads V1, V3, V5, and V6, are determined by the arithmetic operation based on the relationship among the potentials [V], lead vectors [L], and heart vector [H].

[0082] In the third embodiment, therefore, the extended lead potentials (ECG signals of V7, V8, V9 and V3R, V4R, V5R) of the extended lead ECG except for the standard 12-lead ECG are calculated by an arithmetic operation from the standard lead potent...

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Abstract

There are provided an electrocardiograph with an extended lead function and an extended lead ECG deriving method capable of easily deriving an ECG signal of an extended lead ECG by an arithmetic operation, based on ECG signals of a standard 12-lead ECG measured by a potential detector 10. An ECG memory 12 stores the ECG signals measured as the standard 12-lead ECG by the potential detector 10. An extended lead ECG calculator 16 calculates extended lead ECGs V7-V9 from the ECG signals stored in the ECG memory 12, using coefficients α representing a relationship among leads. The extended lead ECGs V7-V9 calculated are displayed through an extended lead ECG waveform outputting device 18 on a display monitor 20.

Description

TECHNICAL FIELD [0001] The present invention relates to an electrocardiograph with an extended lead function and an extended lead electrocardiogram (ECG) deriving method capable of easily and correctly obtaining through an arithmetic operation, an extended lead ECG effective to diagnoses of an ischemic heart disease, an acute cardiac infarction, etc. in the cardiac muscle regions difficult to diagnose even with the standard 12-lead ECG. BACKGROUND ART [0002] For measuring an ECG of a patient, ten electrodes connected to an electrocardiograph are used as mounted at six locations for measurement of chest leads and at four locations for measurement of limb leads. Then the electrocardiograph calculates and outputs the six limb lead waveforms (I, II, III, aVR, aVL, and aVF) of the standard 12 leads and the six chest lead waveforms (V1, V2, V3, V4, V5, and V6) of the standard 12 leads, based on heart potentials detected from these ten electrodes. [0003] In general, the relationship based ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61B5/0402
CPCA61B5/0402A61B5/318A61B5/329
Inventor WEI, DAMING
Owner THE UNIV OF AIZU PUBLIC UNIV CORP
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