METHOD FOR GENERATING THREE STANDARD SURFACE ECG LEADS DERIVED FROM THREE ELECTRODES CONTAINED IN THE MID-HORIZONTAL PLANE OF THE TORSO

• US 20090054795A1
• Filed: 08/22/2007
• Published: 02/26/2009
• Est. Priority Date: 08/22/2007
• Status: Abandoned Application

• Current Assignee: Dale J. Misczynski, Illya Chaykovsky, Mykola Budnyk, Vladislav Bukhman
• Original Assignee: Dale J. Misczynski, Illya Chaykovsky, Mykola Budnyk, Vladislav Bukhman
• Inventors: Budnyk, Mykola, Chaykovsky, Illya, Misczynski, Dale J., Bukhman, Vladislav
• Application Number:
  US11/843,183
• Publication Number:
  US 20090054795A1
• Time in Patent Office: Days
• US Class Current: 600/509
• CPC Class Codes: A61B 5/341 Vectorcardiography [VCG]
• CPC Class Codes: A61B 5/6831 Straps, bands or harnesses

Abstract

A method for a 3-lead electrocardiographic (ECG) recording comprising three signal electrodes contained in the mid-horizontal plane of the human torso and the calculation of the standard leads I, II and III. Such electrodes are placed in-line as in a chest belt instead of the traditional positioning of electrodes in the upper and low parts of the frontal plane of the torso.

Claims

1. A method for obtaining calculated standard leads I, II, and III from placement of electrodes in a mid-frontal plane of a human torso comprising the steps of:

a) positioning at least three signal electrodes in the mid-frontal plane of the human torso;

b) calculating scaling coefficients between standard and modified electrode placement calculated by simultaneous recording of both placements;

c) calculating standard leads from modified leads using the scaling coefficients;

d) adjusting new coefficients if waveforms of calculated lead differ from templates;

e) calculating scaling coefficient for lead I utilizing a sum of lead mI and mII and obtaining a standard lead I from the modified leads;

f) calculating scaling coefficients between standard lead II and modified lead mII; and

g) refining a scaling coefficient for lead III using a difference of lead mIII and lead mII.

2. The method of claim 1, wherein a mid-horizontal placement is formed by rotating a frontal triangle of a standard electrode placement forward by 90°

.

3. The method of claim 2, wherein a harness with electrodes is placed on a thorax in a mid-horizontal plane and includes at least three signal electrodes mounted in such way that two of the three signal electrodes are positioned in 5^th Intercostal Space at Left and Right Anterior Axillary Lines and a third of the three signal electrodes is positioned in 5^th Intercostal Space at Posterior Axillary Line.

4. The method of claim 1, wherein a set of ECGs is obtained from a group of volunteers by simultaneous recording of signals using a standard lead I, II and III placement and mid-horizontal mI, mII and mIII lead placement.

5. The method of claim 4, wherein scaling coefficients during a cardiocycle are calculated for the group of volunteers by (sign <

. . . >

denoting time-averaging procedure);

k1j(t)=<

Ij(t)/mIj(t)>

, k2j(t)=<

Iij(t)/mIIj(t)>

, k3j(t)=<

IIIj(t)/mIIIj(t)>

.

6. The method of claim 5, wherein the scaling coefficients are averaged into a learning group by (sign <

<

. . . >

>

denoting averaging procedure over group);

K1(t)=<

<

k1j(t)>

>

, K2(t)=<

<

k2j(t)>

>

, K3(t)=<

<

k3j(t)>

>

.

7. The method of claim 6, wherein a normalized signal is calculated for lead I by:

Δ

Ij=max{mIj}−

min{mIj}, mINj=mIj+Δ

Ij, INj=Ij+Δ

Ij;

wherein;

Δ

Ij is a peak-to peak deviation of signal mI for j-th volunteer;

mINj is a normalized signal for a horizontal placement for the j-th volunteer; and

INj is a normalized signal for a Standard placement for the j-th volunteer.

8. The method of claim 6, wherein a normalized signal is calculated for lead II by:

Δ

IIj=max{mIIj}−

min{mIIj}, mIINj=mIIj+Δ

IIj, IINj=IIj+Δ

IIj;

wherein;

Δ

IIj is a peak-to peak deviation of signal mII for j-th volunteer;

mIINj is a normalized signal for a horizontal placement for the j-th volunteer; and

IINj is a normalized signal for a Standard placement for the j-th volunteer.

9. The method of claim 6, wherein a normalized signal is calculated for lead III by:

Δ

IIIj=max{mIIIj}−

min{mIIIj}, mIIINj=mIIIj+Δ

IIIj, IIINj=IIIj+Δ

IIIj;

wherein;

Δ

IIIj is a peak-to peak deviation of signal mIII for j-th volunteer;

mIIINj is a normalized signal for a horizontal placement for the j-th volunteer; and

IIINj is a normalized signal for a Standard placement for the j-th volunteer.

10. The method of claim 7, wherein normalized coefficients for the lead I are time averaged during the cardiocycle by:

k1Nj(t)=<

INj/mINj>

, K1N(t)=<

<

k1Nj(t)>

>

.

11. The method of claim 8, wherein normalized coefficients for the lead II are time averaged during the cardiocycle by:

k2Nj(t)=<

IINj/mIINj>

, K2N(t)=<

<

k2Nj(t)>

>

.

12. The method of claim 9, wherein normalized coefficients for the lead III are time averaged during the cardiocycle by:

k3Nj(t)=<

IIINj/mIIINj>

, K3N(t)=<

<

k3Nj(t)>

>

.

13. The method of claim 1, wherein a standard lead I is calculated by:

Ii=KIN*mINi−

Δ

Ii;

wherein;

Δ

Ii is a peak-to peak deviation of signal mI for i-th person from a control group; and

mINi is a normalized signal for a proposed placement for above i-th person.

14. The method of claim 1, wherein a standard lead II is calculated by:

Ii=KIIN*mIINi−

Δ

Ii;

wherein;

Δ

IIi is a peak-to peak deviation of signal mII for i-th person from a control group; and

mIINi is a normalized signal for a proposed placement for above i-th person.

15. The method of claim 1, wherein a standard lead III is calculated by:

IIIi=KIIIN*mIIINi−

Δ

IIi;

wherein;

Δ

IIIi is a peak-to peak deviation of signal mI for i-th person from a control group; and

mIIINi is a normalized signal for a proposed placement for above i-th person.

16. The method of claim 1, wherein calculated lead I, II and III waveforms are compared with averaged waveforms of standard leads, wherein if two signals differ by a predefined threshold then a calculated signal is included in a learning group and coefficients are recalculated and stored in a memory by replacing an old template.

17. The method of claim 1, wherein normalized coefficients of lead I are calculated by:

k1Nj(t)=<

INj(t)/[mINj(t)+mIINj(t)]>

;

wherein;

mIINj is a normalized signal for a proposed placement for j-th volunteer.

18. The method of claim 1, wherein a standard lead I is calculated by:

Ii(t)=K1N(t)*[mINi(t)+mIINi(t)]−

(Δ

Ii+Δ

IIi);

wherein;

Δ

IIi is a peak-to peak deviation of signal mII for i-th person outside from a learning group.

19. The method of claim 1, wherein the scaling coefficient for lead II is calculated by:

k2Nj(t)=<

IINj/mIINj>

, K2N(t)=<

<

k2Nj(t)>

>

;

wherein;

IINj is a normalized signal for the Standard lead II for j-th volunteer.

20. The method of claim 1, wherein the scaling coefficient for lead III is calculated by:

k3Nj(t)=<

IIINj(t)/[mIIINj(t)−

mIINj(t)]>

, K3N(t)=<

<

k3Nj(t)>

>

;

IIIi(t)=K3N(t)*[mIIINi(t)−

mIINi(t)]−

(Δ

IIIi−

Δ

IIi);

wherein;

IIINj is a normalized signal for a Standard lead III for j-th volunteer;

mINj is a normalized signal for a horizontal lead mIII for j-th volunteer; and

Δ

IIIi is a peak-to peak deviation of signal mIII for i-th person outside from a learning group.