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Method and device for evaluation of myocardial damages based on the current density variations

A technology of current density and myocardial damage, applied in the medical field, can solve the problems of electrical process damage, lack of myocardium, heterogeneity and anisotropy of electrical properties, etc., and achieve the effect of improving reliability.

Inactive Publication Date: 2015-01-07
伊利娅·阿纳托利欧维奇·柴可夫斯基
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 1) Only the vector sum that only reflects the overall situation of the myocardium is analyzed; as a result, many local electrical process damages are not detected
[0005] 2) The information used is only about the difference in electric potential between points on the body surface, without information about the current density distribution (CDD) inside the myocardium, so this information is limited due to the inhomogeneity and anisotropy of the electrical properties of the body tissue around the heart misinterpreted
Another flaw is that an average index is applied, which does not take into account its variation over time

Method used

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  • Method and device for evaluation of myocardial damages based on the current density variations
  • Method and device for evaluation of myocardial damages based on the current density variations
  • Method and device for evaluation of myocardial damages based on the current density variations

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Embodiment Construction

[0084] In the main embodiment of the method of the invention, said method comprises a sequence of operations, performing the individual steps of the algorithm, each step being performed using the proposed method. A schematic diagram of the method is shown in figure 1 shown, where the dashed steps do not describe the proposed method, but are only used to illustrate its background.

[0085] Step 1. Perform MCG inspection, preliminary signal processing and calculations on the magnetic field map set.

[0086] The specific implementation of the proposed method consists of performing an MCG check initially, while performing ECG registration in a second standard lead and processing the received signal. The final step consists of multiple operations: preliminary processing of the MFM map set (filtering, removal of complexes with impulse interference, selection of cardiac cycles of the same type and averaging) and calculation, and CDD in a square area of ​​20 × 20 cm Reconstruction o...

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Abstract

Invention is related to cardiology and intended for diagnosis of ischemic myocardial injuries. Magnetocardiographic examination is executed, current density vectors maps are reconstructed during ST-T interval and 4 sub-intervals of QRS complex, quantitative diagnostic indicators are calculated. Characterized in that, for said time intervals total length of all vectors (total current), autocorrelation coefficient of the instant map and its correlation with map onto the T wave peak are derived, several quantitative indicators for these curves are calculated (area under the curve, time intervals, their ratio, etc.) and ranges of their values are divided onto 3 intervals. As a result, absence / presence of ventricles injuries is diagnosed according to the rule—injury is absent (presence minor, significant), if certain quantitative indicator is ranged in one of 3 said intervals or if score of points for separate quantitative indicators is less than or equal to 7 (8-16, 17 and more).

Description

technical field [0001] The invention relates to the field of medicine, ie cardiology, and can be used for the diagnosis of electrophysiological injuries and other myocardial injuries. Currently, reliable diagnosis of most cardiac diseases remains an ongoing clinical problem. Background technique [0002] For example, for the diagnosis of myocardial ischemia by the widely used method of analysis of the electrical activity of the heart - ECG, there are several known diagnostic criteria that can be used, characterized by the magnitude and direction of the cardiac EMF vector at different moments of the cardiac cycle. For example, in the vector-ECG method [Non-invasive diagnosis of coronary artery disease using cardiogoniometry performed at rest, W. Schupbach, B. Emese, P. Loretan et al, Swiss Medical Weekly, 2008; 138(15-16): 230 -238, www.smw.ch], 13 magnitude and angle indices characterizing repolarization and depolarization processes were used for the diagnosis of ischemic h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/05A61B5/04A61B5/0452A61B5/336
CPCA61B5/04007A61B5/7275A61B5/05A61B5/243
Inventor 伊利娅·阿纳托利欧维奇·柴可夫斯基
Owner 伊利娅·阿纳托利欧维奇·柴可夫斯基
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