JP2014042755A - Electrocardiogram information display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that, in an electrocardiogram information display method for displaying standard 12-lead electrocardiogram waveforms, 6 lead electrocardiogram waveforms as coronal plane lead electrocardiograms and 6 lead electrocardiogram waveforms as thoracic horizontal lead electrocardiograms are displayed, however, it is not easy to highly accurately acquire, by a visual observation of an electrocardiogram, an angle of a maximum QRS vector in the coronal plane and the thoracic horizontal plane, a position of an ischemic part of the heart muscle, and the like.SOLUTION: When a voltage at a same time point with respect to each electrocardiogram waveform on each plane of the coronal plane and the thoracic horizontal plane, is displayed on an axis where an angle of a lead axis of the electrocardiogram waveform and an angle of each axis radially disposed from a center of a graph match, and a radar graph having the radial axes is displayed, it becomes easy to understand a relation between the electrocardiogram voltages and the angles of the lead axes. Further, when an interpolation is performed in the angle direction of each lead axis to increase electrocardiogram waveforms and a radar graph is displayed, the smoothly changing radar graph is provided, so that an operator can highly accurately read the angle of the maximum QRS vector of the heart, the position of the ischemic part of the heart muscle, and the like.

Description

  The present invention relates to an electrocardiogram information display method for displaying electrocardiogram information comprising a standard 12-lead electrocardiogram waveform. For the frontal lead electrocardiogram information and the thoracic horizontal lead electrocardiogram information, the maximum QRS vector of the heart and the position of the myocardial ischemia are The present invention relates to an electrocardiogram information display method that can be easily and simply specified. The standard 12 guidance is a concept including standard limb guidance, monopolar limb guidance, and monopolar chest guidance.

  In the electrocardiograph displaying the standard 12-lead ECG waveform, the standard 12-lead ECG waveform is the frontal lead ECG waveform (I, II, III, aVR, aVL, aVF) and the chest horizontal plane as described in Non-Patent Document 1. It is composed of guided electrocardiogram waveforms (V1, V2, V3, V4, V5, V6). Here, leads I, II and III are standard limb leads, leads aVR, aVL and aVF are unipolar limb leads, and leads V1, V2, V3, V4, V5 and V6 are unipolar chest leads.

Frontal lead electrocardiogram waveforms (I, II, III, aVR, aVL, aVF) are measured with electrodes attached to the right hand, left hand, and left foot.
Leads I, II, and III are bipolar limb leads, and are obtained by the following formula.
I = vL-vR, II = vF-vR, III = vF-vL,
However, vR is a voltage detected at the right hand electrode mounting position, vL is a voltage detected at the left hand electrode mounting position, and vF is a voltage detected at the left foot electrode mounting position.
Here, the angle of the lead axis for lead I is the angle at which the right hand electrode is viewed from the left hand electrode.
The angle of the lead axis for lead II is the angle at which the right hand electrode is viewed from the left foot electrode
The angle of the lead axis of lead III is an angle at which the left hand electrode is viewed from the left foot electrode.
Therefore, the angle of the guide axis when the left horizontal direction on the frontal plane is 0 degree and the angle is clockwise is
I Guide shaft angle = 0 degrees
II guide axis angle = 60 degrees
The angle of the guiding axis of III guidance is 120 degrees.

Further, aVR, aVL, and aVF are unipolar limb leads, and are obtained by the following equations.
aVR = vR− (vL + vF) / 2 = − (I + II) / 2
aVL = vL− (vR + vF) / 2 = (I−III) / 2
aVF = vF− (vL + vR) / 2 = (II + III) / 2
here,
The angle of the induction axis for aVR induction is the angle at which the left hand electrode and the left foot electrode are seen from the right hand electrode. The angle of the induction axis for the aVL induction is the angle at which the right hand electrode and the left foot electrode are seen from the left hand electrode. The angle is an angle at which the middle of the right hand electrode and the left hand electrode is viewed from the left foot electrode.
Accordingly, when the left horizontal direction on the frontal plane plane is 0 degree and the angle is clockwise, the guide axis angle is aVR guide guide axis angle = −150 degrees aVL guide guide axis angle = −30. Degree aVF guidance angle = 90 degrees.

  Here, if frontal surface lead electrocardiogram waveforms are displayed in the order of the angle of the lead axis, aVL (−30 degrees), I (0 degrees), −aVR (30 degrees), II (60 degrees), aVF (90 degrees), The order is III (120 degrees). Here, the angle in parentheses is the angle of the guide shaft when the left horizontal direction is 0 degree on the frontal plane and the angle is clockwise. Further, -aVR is a waveform obtained by multiplying the voltage of aVR by -1, and the angle of the induction axis is 180 degrees from the angle (-150 degrees) of the induction axis of aVR, that is, 30 degrees. In the frontal lead ECG waveform, the difference between the lead axis angle of the ECG waveform created by multiplying the voltage of each lead ECG waveform by -1 and the lead axis angle of the ECG waveform before being multiplied by -1 is 180 degrees. Become. In the thoracic horizontal lead electrocardiogram waveform (V1, V2, V3, V4, V5, V6), the angle of the lead axis of the electrocardiogram waveform created by multiplying the voltage of each lead electrocardiogram waveform by -1 and before multiplying by -1. The difference from the angle of the lead axis of the electrocardiogram waveform is 180 degrees.

  The display sensitivities of the I, II, and III lead ECG waveforms and the aVR, aVL, and aVF lead ECG waveforms are different. When displaying in order of lead axis angle in frontal lead ECG, ECG waveforms with different sensitivities will be mixed and displayed, so frontal lead ECG waveforms are usually not displayed in lead axis angle order. There are many cases. Therefore, frontal lead electrocardiogram waveforms (I, II, III, aVR, aVL, aVF waveforms) are often displayed in the order of I, II, III, aVR, aVL, aVF as shown in FIG. It is often not displayed in the order of angle. Therefore, it is not easy for a doctor to accurately determine the angle of the maximum QRS vector of the heart and the position of the ischemic site of the myocardium by visually observing the frontal lead electrocardiogram at the clinical site.

  An electrocardiogram automatic analyzer that can analyze an electrocardiogram waveform obtained by an electrocardiograph has also been proposed. This electrocardiogram automatic analyzer selects an electrocardiogram to be analyzed, and performs analysis processing such as measurement and analysis of electrocardiogram findings for the selected electrocardiogram waveform. However, in many clinical settings, the automatic analyzer is not used. . When a doctor examines a patient, the judgment is often made only from the waveform of a standard 12-lead electrocardiogram, and the display of electrocardiogram information that assists the diagnosis of the doctor is rarely used in clinical practice.

  The prior art of Patent Document 1 (Patent No. 3855118) is a linear graph display that sequentially arranges the leads in the order of the leads so that the height relationship of the R wave or S wave height of each lead ECG waveform can be compared. The main purpose is to display the specific wave height of each lead electrocardiogram waveform so that it can be compared with the previous measurement result, and to detect the erroneous mounting of the electrodes. The present invention aimed at obtaining the angle of the maximum QRS vector, the position of the ischemic region of the myocardium, etc. by reflecting the angle of the lead axis of each lead electrocardiogram as the angle of the axis of the radar graph. Is different.

Japanese Patent No. 3855118

Heart Electrical Phenomenon Horikawa Muneyuki Tokyo Denki University Press March 20, 1982

  In the frontal lead electrocardiogram, the direction horizontally facing the left from the heart is set to 0 degree, and the angles are clockwise, and aVL (-30 degrees), I (0 degrees), -aVR (30 degrees), II (60 degrees) ), AVF (90 degrees), and III (120 degrees) in this order, the ECG waveforms can be arranged in order of the induction angle at 30 degree intervals. Here, the angle in parentheses is the angle of the guide axis. However, since the aVR, aVL, and aVF inductions have different sensitivities from the I, II, and III inductions, it is necessary to correct the amplitude so that the same sensitivity is obtained.

  When the ECG waveforms are arranged in the order of the angle of the lead axis on the frontal surface, it becomes easy to see to some extent. In particular, an R wave having a large amplitude makes it easy to observe the change with respect to the angle of the lead axis on the ECG. However, for the ST portion having a small amplitude, there is a difficulty that the state of change with respect to the angle of the guide axis cannot be accurately determined from the electrocardiogram.

  To solve this problem, not only observe on the ECG how the ECG voltage varies with the angle of the lead axis, but also draw the relationship between the lead axis angle of each lead and the ECG voltage in an appropriate graph. There is a need. Also, for the ST portion having a small amplitude on the electrocardiogram, if the relationship between the angle of the induction axis and the electrocardiogram voltage is drawn on the graph of the ST portion alone, the amplitude can be enlarged and displayed. It becomes easy to observe the change of the part. In this way, the angle of the maximum QRS vector of the heart, the position of the ischemic site of the myocardium, etc. can be determined appropriately.

  Since the horizontal axis of the electrocardiogram is time, changes with time are easy to read from the electrocardiogram. However, the frontal lead ECG of the standard 12-lead ECG that is generally used has information about the change in the angle direction of the lead axis every 30 degrees, and the thoracic horizontal lead ECG also shows the change in the angle direction of the lead axis. The information is every 20 to 30 degrees. When drawing the relationship between the angle of the lead axis of each lead and the electrocardiogram voltage in the graph, the information on the angle direction of the lead axis is too large every 30 degrees, so the amount of information is increased and the angle interval is made smaller. Means are also needed.

  An object of the present invention is to provide an electrocardiogram information display method with good visibility that assists a doctor's diagnosis by displaying in an easy-to-understand manner information regarding changes in the direction of the angle of the lead axis of the frontal lead electrocardiogram and the thoracic horizontal lead electrocardiogram. is there.

  The present invention has been made for the purpose of solving the above-described problems, and includes the following configuration as one means for solving the above-described problems.

  In the present invention, a radar graph is used to graph the relationship between the angle of the lead axis and the electrocardiogram voltage of the frontal lead electrocardiogram and the thoracic horizontal lead electrocardiogram. A radar graph has a radial axis, a value corresponding to each radial axis is marked on the axis, and points marked on the axis are connected in order to draw a loop graph. Such a graph is generally called a radar graph or a radar chart. The angle of the axis of the radar graph is matched with the angle of the induction axis of the ECG waveform, and the scale on the axis of the radar graph is made to correspond to the voltage of the ECG. The radar graph of the present invention makes it possible to visually recognize the angle of the induction axis of the electrocardiogram waveform as the angle of the radial axis on the radar graph. Therefore, the relationship between the angle of the induction axis of the electrocardiogram waveform and the electrocardiogram voltage can be clearly displayed. Also, for the ST portion with a small amplitude, if the voltage scale of the radar graph is adjusted according to the amplitude of the ST portion and the ST portion is drawn on the radar graph alone, the change in the ST portion with respect to the angle of the guide axis is detailed. Can be observed.

  The information on the change in the angle direction of the lead axis of the frontal lead electrocardiogram is every 30 degrees in the standard 12 lead electrocardiogram, but the lead axis of the frontal lead electrocardiogram is obtained by interpolating the electrocardiogram waveform in the angle direction of the lead axis. It was found that the angle of the maximum QRS vector and the position of the ischemic site of the myocardium can be accurately recognized when the angle interval is set to 15 degrees or less and displayed in a radar graph.

  In order to increase the information on the angle direction of the lead axis of the frontal lead electrocardiogram, the electrocardiogram waveform is interpolated in the angle direction of the lead axis. When the ECG waveform is interpolated in the angle direction of the lead axis, a waveform that fills between adjacent ECG waveforms is obtained by interpolation, and the data in the angle direction of the lead axis is increased. However, since the display sensitivities of the I, II, and III lead ECG waveforms and the aVR, aVL, and aVF lead ECG waveforms are different, the amplitudes of the aVR, aVL, and aVF lead ECG waveforms are corrected before interpolation. It is necessary to have the same display sensitivity as that of the ECG waveforms of II, III, and III. Another method is to increase the ECG waveform in the angular direction of the lead axis by performing several interpolations from the I, II and III lead ECG waveforms without using the aVR, aVL, and aVF lead ECG waveforms. There is also.

  The radar graph of the present invention has a shape very similar to the display of a vector electrocardiogram, but the vector electrocardiogram depicts how the electromotive force vector of the heart changes over time as described in Non-Patent Document 1. is there. The radar graph of the present invention depicts the relationship between the voltage of each lead electrocardiogram waveform at a certain moment and the angle of the lead axis, and there is no time lapse in one radar graph. The radar graph of the present invention is different from the method of displaying a vector electrocardiogram.

  As described above, in the present invention, the angle of the induction axis of the electrocardiogram waveform is made to correspond to the angle of the radial axis of the radar graph, and the voltage of the electrocardiogram waveform is displayed on the radial axis of the radar graph. It is possible to visually recognize how the voltage changes with respect to the angle of the induction shaft. Therefore, the angle of the maximum QRS vector of the heart, the position of the ischemic site, and the like can be accurately recognized.

  In addition, it is difficult to accurately read on the electrocardiogram how the voltage of a waveform having a small amplitude such as the ST portion changes depending on the angle of the induction axis. However, if only the ST portion is drawn on the radar graph alone, the voltage of the ST portion Since the change can be magnified and displayed, the angle of the guide axis that maximizes the decrease or increase of the ST portion can be clearly determined. Therefore, it is possible to accurately recognize the position of the ischemic site of the myocardium.

  Further, when the ECG waveform is increased by interpolation of the ECG waveform, the angle interval of the guide axis is set to 15 degrees or less, and the radar graph is displayed, the angle of the maximum QRS vector, the position of the myocardial ischemic site, etc. can be recognized more accurately.

  In addition, since the radar graph of the present invention does not need to be displayed in real time during electrocardiogram measurement, high-speed arithmetic processing is not necessary. Therefore, after the electrocardiogram measurement is completed, the waveform data of the electrocardiogram can be read from the memory or storage medium, processed by software, and the radar graph can be displayed. Therefore, a high-speed arithmetic circuit such as an interpolation arithmetic circuit is installed on the electrocardiogram information display device. There is no need to incorporate it in the wear. Therefore, there is little increase in the manufacturing cost of the electrocardiogram information display device by displaying the radar graph of the present invention.

  The present invention becomes an effective auxiliary means for diagnosis by a doctor, and can contribute to improvement of accuracy of diagnosis and reduction of diagnosis time.

In the electrocardiogram waveform of FIG. 2, it is a radar graph at the time when the decrease in the ST portion is maximum, and the voltage of the ST portion when the angle of the guide axis changes is plotted. The ECG waveform is increased by performing an interpolation operation on the frontal lead ECG corrected to have the same display sensitivity and the induction angle interval is 15 degrees, and the time when the radar graph display is performed is ST. The point of time when the decrease in the portion is maximum is indicated by a broken line. In the electrocardiogram waveform of FIG. 4, it is a radar graph at the time when the R wave becomes maximum, and the voltage of the R wave when the angle of the guide axis changes is plotted. The electrocardiogram waveform is increased by interpolating the frontal lead electrocardiogram corrected to have the same display sensitivity to increase the lead electrocardiogram waveform, and the lead angle interval is 15 degrees. It is designated by the operator at the time when the wave is maximum, and is represented by a broken line. In the electrocardiogram waveform of FIG. 6, it is a radar graph at the time when the decrease of the ST portion becomes maximum, and the voltage of the ST portion at each induction angle is plotted. The frontal lead ECG waveform (I, II, III, aVR, aVL, aVF waveform) is an ECG waveform that is not interpolated, but is corrected so as to have the same display sensitivity, and when the radar graph is displayed. Is the point at which the decrease in the ST portion is maximum, and is represented by a broken line. This is an operation control program in the case where the radar graph is displayed in advance at the time when the ST band drop is maximized. Example 1 This is an operation control program when an operator designates a time point for displaying a radar graph on an electrocardiogram. (Example 2) Prior art frontal lead ECG

  Embodiments of an electrocardiogram information display method according to the present invention will be described below in detail with reference to the accompanying drawings.

  A first embodiment which is a first embodiment of the present invention will be described. When displaying the radar graph, a common time point is designated for each lead ECG waveform, and the voltage of each lead ECG waveform at that point is displayed on the radar graph. In the first embodiment, the radar graph is displayed at a time point set in advance in the electrocardiogram information display device. In the first embodiment, at the time point set in advance in the electrocardiogram information display device, the decrease width of the ST portion is maximized. It is time to become.

  The time point set in advance in the electrocardiogram information display device may be set in accordance with the symptom of the subject. In general, the time point when the amplitude of the P wave becomes maximum, the time point when the amplitude of the Q wave becomes maximum, There may be a time when the amplitude is maximized, a time when the amplitude of the S wave is maximized, a time when the amplitude of the T wave is maximized, a time when the decrease or rise of the ST portion is maximized, and the like.

  Next, an operation control program for the electrocardiogram information display method according to the first embodiment will be described. FIG. 7 shows an operation control program according to the first embodiment. FIG. 7 shows a control program for creating a radar graph from the frontal lead electrocardiogram. The time point at which the radar graph is displayed is determined in advance at the time point when the decrease width of the ST portion becomes maximum. The control program of FIG. 7 attaches predetermined electrodes to the subject, and acquisition of standard 12-lead ECG information is completed by the electrocardiograph, and the electrocardiogram waveform data is stored in the electrocardiograph memory or storage medium or the electrocardiogram. Start from a state stored in a memory or storage medium such as a computer other than the meter. Moreover, the control program of FIG. 7 is a control program in the case of interpolating an electrocardiogram waveform in the angular direction of the lead axis of the lead electrocardiogram waveform.

  In the control program of FIG. 7, first, I, II, III, aVR, aVL, aVF lead electrocardiogram waveform data is read from a memory or a storage medium (STEP-1). Here, the I, II, III lead ECG waveforms and the aVR, aVL, aVF lead ECG waveforms have different display sensitivities, so the aVR, aVL, aVF lead ECG waveforms have the same sensitivity as the I, II, III lead ECG waveforms. Thus, the amplitudes of the aVR, aVL, and aVF lead electrocardiogram waveforms are corrected (STEP-2). Next, interpolation calculation is performed to perform interpolation in the angular direction of the guide shaft (STEP-3). Based on this result, the measured electrocardiogram and the electrocardiogram created by interpolation are combined and displayed as an electrocardiogram waveform in FIG. 2 (STEP-4). Next, the time point at which the ST width is maximized is determined from the electrocardiogram data. On the electrocardiogram in FIG. 2, the point in time when the decrease width of the ST portion is maximized is indicated by a broken line. (STEP-5). The relationship between the angle of the lead axis of the electrocardiogram waveform of the electrocardiogram and the electrocardiogram voltage is drawn on the radar graph as shown in FIG. 1 (STEP-6). Then, the control program is terminated (STEP-7).

  1 and 2 are display examples of Example 1 in the electrocardiogram information display method according to the present invention. FIG. 2 shows the electrocardiogram waveform by interpolating the electrocardiogram waveform in the direction of the angle of the lead axis and setting the angle interval of the lead axis of the lead electrocardiogram waveform to 15 degrees. In FIG. 2, a time point indicated by a broken line is a time point at which the decrease in the ST portion becomes the largest. At the time of the broken line in FIG. 2, the ECG lead axis angle corresponds to the angle of the radar graph axis, and the ECG voltage corresponds to the scale on the radar graph axis in the radar graph. It is.

  As shown in FIG. 1, since the ST portion has the greatest decrease when the angle of the lead axis is 105 degrees, it is suspected that an ischemic part exists in the lower left ventricular wall corresponding to the angle of the lead axis of 105 degrees. . The above is the description of the first embodiment.

  Next, a second embodiment which is a second embodiment of the present invention will be described. In the second embodiment, the operator designates a time point for displaying the radar graph on the electrocardiogram. FIG. 8 shows an operation control program when an operator designates a time point at which a radar graph is displayed on an electrocardiogram. FIG. 8 is a control program for creating a radar graph from the frontal surface lead electrocardiogram, and interpolates the electrocardiogram waveform in the angular direction of the lead axis of the lead electrocardiogram waveform.

  The control program in FIG. 8 attaches predetermined electrodes to the subject, the acquisition of standard 12-lead ECG information by the electrocardiograph is completed, and the electrocardiogram waveform data is stored in the electrocardiograph memory or storage medium or the electrocardiogram. Start from a state stored in a memory or storage medium such as a computer other than the meter.

  In FIG. 8, electrocardiogram waveform data for I, II, III, aVR, aVL, and aVF is read from a memory or storage medium (STEP-1). Here, the I, II, III lead ECG waveforms and the aVR, aVL, aVF lead ECG waveforms have different display sensitivities, so the aVR, aVL, aVF lead ECG waveforms have the same sensitivity as the I, II, III lead ECG waveforms. Thus, the amplitudes of the aVR, aVL, and aVF lead electrocardiogram waveforms are corrected (STEP-2). Next, interpolation calculation is performed to perform interpolation in the angular direction of the guide shaft (STEP-3). Based on this result, the measured electrocardiogram and the electrocardiogram created by interpolation are combined and displayed as an electrocardiogram waveform in FIG. 4 (STEP-4).

  Next, the operator moves the broken line to the left and right on the electrocardiogram in FIG. 4 to designate the point in time when the radar graph is displayed (STEP-5). At the specified time, the relationship between the angle of the lead axis of the lead electrocardiogram waveform and the electrocardiogram voltage is drawn on the radar graph as shown in FIG. 3 (STEP-6). Next, the operator is asked whether it is necessary to draw a radar graph at another time (STEP-7). If YES, return to (STEP-5). If NO, go to (STEP-8) and end the control program.

  3 and 4 are display examples of Example 2 in the electrocardiogram information display method according to the present invention. FIG. 4 shows the electrocardiogram waveform displayed by interpolating the electrocardiogram waveform in the angular direction of the lead axis of the lead electrocardiogram waveform and setting the angle interval of the lead axis of the lead electrocardiogram waveform to 15 degrees. In FIG. 4, a time point indicated by a broken line is a time point specified by the operator, and is a time point when the amplitude of the R wave becomes the largest. At the time of the broken line in FIG. 4, the ECG lead axis angle corresponds to the angle of the radar graph axis, and the ECG voltage corresponds to the scale on the radar graph axis and is displayed in the radar graph as shown in FIG. It is. As can be seen from FIG. 3, since the R wave is maximized when the angle of the guide axis is 75 degrees, the maximum QRS vector of the heart in the frontal plane is at 75 degrees. The above is the description of the second embodiment.

  Example 1 and Example 2 are examples when the electrocardiogram waveform is interpolated in the angular direction of the lead axis of the lead electrocardiogram waveform, but the electrocardiogram when the electrocardiogram waveform is not interpolated in the angular direction of the lead axis is shown. As shown in FIG. The electrocardiogram of FIG. 6 reads I, II, III, aVR, aVL, aVF lead ECG waveform data, and aVR, aVL, aVF lead ECG waveform has the same sensitivity as the I, II, III lead ECG waveform, The amplitude of the aVL and aVF lead ECG waveforms is corrected.

  In the electrocardiogram of FIG. 6, the radar graph is displayed at the time when the decrease in the ST portion is the largest, as shown in FIG. Compared with the radar graph of FIG. 1, in the radar graph of FIG. 5, the interval between the data is widened, and the angle of the guide axis at which the ST portion is the lowest cannot be accurately specified. It can be seen that the angle interval of the guide shafts is too large at 30 degree intervals.

  An object of the present invention is to display electrocardiogram information for assisting a doctor's diagnosis in an electrocardiogram information display method for displaying electrocardiogram information including a standard 12-lead electrocardiogram waveform. Therefore, when creating ECG waveforms and radar graphs as shown in FIGS. 1, 2, 3, 4, 5, and 6, it is not necessary to display the subject's ECG in real time while measuring it. In addition, after the standard 12-lead ECG waveform measurement is completed, the ECG waveform data stored in the memory or storage medium of the electrocardiograph or the memory or storage medium of a computer other than the electrocardiograph are shown in FIGS. 2, ECG waveforms and radar graphs as shown in FIG. 3, FIG. 4, FIG. 5, FIG. That is, when creating the electrocardiogram information displayed in the present invention, it is not necessary to display the radar graph in real time during the electrocardiogram measurement, so there is a time margin in creating the display. When time constraints are severe, it is necessary to configure a circuit for processing such as computation with hardware to perform data processing at high speed. However, in the present invention, there is a time margin for creating electrocardiogram information. Therefore, it is not necessary to perform arithmetic processing by hardware, and arithmetic processing can be performed by software.

  Next, a method for interpolating the lead ECG waveform in the lead axis direction will be described. There are various interpolation methods such as a bilinear interpolation method, a bicubic interpolation method, a Lagrangian interpolation method, and a spline interpolation method. In the frontal lead electrocardiogram, the data are lined up at equal intervals in the direction of the lead axis. In such a case, if an oversampling digital filter used in the DA converter of the audio device is used, interpolation with the highest interpolation accuracy can be performed. The oversampling digital filter of the audio equipment performs interpolation in the time axis direction, but in the present invention, interpolation is performed in the induction axis direction. Using a digital filter having the same structure as an oversampling digital filter for audio equipment, accurate interpolation in the direction of the guide axis is possible.

Since the display sensitivity of bipolar limb induction (I, II, III induction) is different from the display sensitivity of augmented unipolar limb induction (aVR, aVL, aVF induction), obtain a correction coefficient to make them the same sensitivity For this purpose, I, II, and III lead ECG waveforms were interpolated with an oversampling digital filter. Based on the I, II, and III lead ECG waveforms, the oversampling digital filter performs precise interpolation to obtain waveforms with the same lead axis angle as the aVR, aVL, and aVF leads, and these are corrected aVR lead and corrected aVL lead. , Named modified aVF induction, aVR, aVL, aVF induction waveform and amplitude comparison,
Amplitude of modified aVR induced waveform = amplitude of aVR induced waveform × 1.1547
Amplitude of modified aVL induction waveform = amplitude of aVL induction waveform × 1.1547
Amplitude of modified aVF induction waveform = amplitude of aVF induction waveform × 1.1547
Met.
From this result, in order to make the display sensitivity of the augmented unipolar limb lead (aVR, aVL, aVF lead) the same sensitivity as the bipolar limb lead (I, II, III lead), it should be multiplied by 1.1547. found.

  When the radar graph display of the present invention is performed on the voltage of the frontal lead electrocardiogram waveform, the voltages of the aVR, aVL, and aVF lead electrocardiogram waveforms are corrected by 1.1547, respectively, and corrected aVR, corrected aVL, and corrected aVF are corrected. When displayed as the lead voltage, the radar graph can be displayed with the same sensitivity as the I, II, III lead ECG waveform. When the radar graph display is performed by mixing the voltage of the ECG waveform of aVR, aVL, and aVF with the voltage of the ECG waveform of I, II, III without correcting, the voltage of the ECG waveform of different sensitivity is mixed in the radar graph. Will do. When the radar graph display of the present invention is performed on the voltage of the frontal lead electrocardiogram waveform, it is accurate if the voltage sensitivity of each lead electrocardiogram waveform to be displayed is the same using the corrected aVR, corrected aVL, and corrected aVF lead voltages. Radar graph display becomes possible.

  The present invention is an electrocardiogram information display method that can contribute to improvement in diagnosis accuracy, shortening of diagnosis time, and the like when a doctor makes a diagnosis using a standard 12-lead electrocardiogram in a clinical setting. Therefore, the present invention can be used for electrocardiographs that are widely used in clinical settings and educational settings. It can also be used for polygraphs that measure pulse waves, respiratory waves, heart sounds, blood pressure, heart rate, oxygen saturation, etc. simultaneously with electrocardiogram measurement.

  Unsigned

Claims (9)

  In the electrocardiogram information display method for displaying a standard 12-lead ECG waveform, with respect to ECG information composed of a plurality of ECG waveforms, the angle of the induction axis of the ECG waveform and the graph of the voltage at the same time for each ECG waveform ECG information display, characterized in that the voltage is marked on the axis that coincides with the angle of the axis radially arranged from the center, and the change of the voltage with respect to the angle of the induction axis of the ECG waveform is displayed in a graph with the radial axis Method.   In the electrocardiogram information display method for displaying a standard 12-lead electrocardiogram waveform, an electrocardiogram comprising frontal lead electrocardiogram waveforms (I, II, III, modified aVR, modified aVL, modified aVF) corrected to have the same display sensitivity. For the information, for the voltage at the same time for each ECG waveform, mark the voltage on the axis where the angle of the induction axis of the ECG waveform and the angle of the axis arranged radially from the center of the graph match, An electrocardiogram information display method comprising displaying a change in voltage with respect to an angle of an induction axis of an electrocardiogram waveform in a graph having a radial axis.   In the electrocardiogram information display method for displaying a standard 12-lead ECG waveform, frontal lead ECG waveforms (I, II, III, modified aVR, modified aVL, modified aVF) corrected to have the same display sensitivity and the same The frontal lead electrocardiogram waveform corrected so as to have the display sensitivity and the electrocardiogram waveform (−I, −II, −III, −corrected aVR, −corrected aVL, −corrected) having a difference of 180 degrees in the angle of the guided axis For the electrocardiogram information consisting of aVF), for the voltage at the same time for each electrocardiogram waveform, on the axis where the angle of the induction axis of the electrocardiogram waveform coincides with the angle of the axis radially arranged from the center of the graph An electrocardiogram information display method characterized by marking a voltage and displaying a change in voltage with respect to an angle of an induction axis of an electrocardiogram waveform in a graph having a radial axis.   In the electrocardiogram information display method for displaying a standard 12-lead ECG waveform, frontal lead ECG waveforms (I, II, III, modified aVR, modified aVL, modified aVF) corrected to have the same display sensitivity and the same The frontal lead electrocardiogram waveform corrected so as to have the display sensitivity and the electrocardiogram waveform (−I, −II, −III, −corrected aVR, −corrected aVL, −corrected) having a difference of 180 degrees in the angle of the guided axis aVF), and for the electrocardiogram information obtained by combining a plurality of electrocardiogram waveforms created by performing interpolation in the angular direction of the lead axis based on these electrocardiogram waveforms, the voltage at the same time for each electrocardiogram waveform The voltage is marked on the axis where the angle of the electrocardiogram waveform induction axis coincides with the angle of the axis arranged radially from the center of the graph, and the change in voltage relative to the angle of the electrocardiogram waveform induction axis has a radial axis. ECG information display method and displaying rough.   In the electrocardiogram information display method for displaying a standard 12-lead ECG waveform, frontal lead ECG waveforms (I, II, III, modified aVR, modified aVL, modified aVF) corrected to have the same display sensitivity and the same The frontal lead electrocardiogram waveform corrected so as to have the display sensitivity and the electrocardiogram waveform (−I, −II, −III, −corrected aVR, −corrected aVL, −corrected) having a difference of 180 degrees in the angle of the guided axis aVF), and on the electrocardiogram information obtained by combining a plurality of electrocardiogram waveforms created by performing interpolation using an oversampling digital filter in the angular direction of the lead axis based on these electrocardiogram waveforms. For the voltage at the same point in time, the voltage is marked on the axis where the angle of the ECG waveform lead axis coincides with the angle of the axis radially arranged from the center of the graph. ECG information display method and displaying the change in voltage with respect to the angle of the axis to the graph with the radial axis.   In the electrocardiogram information display method for displaying a standard 12-lead ECG waveform, the measured dipole-lead ECG waveform (I, II, III) and the ECG waveform having a difference of 180 degrees in the angle between the dipole-lead ECG waveform and the lead axis (-I, -II, -III,), and further, each electrocardiogram waveform is targeted for electrocardiogram information obtained by combining a plurality of electrocardiogram waveforms created by performing interpolation in the angular direction of the lead axis based on these electrocardiogram waveforms. On the other hand, with respect to the voltage at the same time, a voltage is marked on the axis where the angle of the induction axis of the ECG waveform coincides with the angle of the axis arranged radially from the center of the graph, and the voltage with respect to the angle of the induction axis of the ECG waveform A method for displaying electrocardiogram information, characterized by displaying a change in a graph with a radial axis.   In the electrocardiogram information display method for displaying a standard 12-lead ECG waveform, the measured dipole-lead ECG waveform (I, II, III) and the ECG waveform having a difference of 180 degrees in the angle between the dipole-lead ECG waveform and the lead axis (-I, -II, -III), and ECG information that combines multiple ECG waveforms created by performing interpolation using an oversampling digital filter in the angular direction of the lead axis based on these ECG waveforms. As a target, for the voltage at the same time for each ECG waveform, the voltage is marked on the axis where the angle of the ECG waveform induction axis coincides with the angle of the axis radially arranged from the center of the graph. A method for displaying electrocardiogram information, comprising: displaying a change in voltage with respect to the angle of the lead axis of the graph in a graph having a radial axis.   In the electrocardiogram information display method for displaying the standard 12-lead ECG waveform, the electrocardiogram information including the thoracic horizontal lead ECG waveforms (V1, V2, V3, V4, V5, V6) is targeted at the same time for each ECG waveform. The voltage is marked on the axis where the angle of the electrocardiogram waveform induction axis coincides with the angle of the axis radially arranged from the center of the graph, and the change of the voltage relative to the induction axis angle of the electrocardiogram waveform is expressed as a radial axis. An electrocardiogram information display method, characterized in that it is displayed on a graph having   In the electrocardiogram information display method for displaying a standard 12-lead ECG waveform, interpolation is performed in the angular direction of the lead axis based on the thoracic horizontal lead ECG waveforms (V1, V2, V3, V4, V5, V6) and these ECG waveforms. For the electrocardiogram information obtained by combining a plurality of generated electrocardiogram waveforms, for each electrocardiogram waveform, for the voltage at the same time, the angle of the ECG waveform induction axis and the angle of the axis arranged radially from the center of the graph, A method of displaying electrocardiogram information, wherein a voltage is marked on an axis where the two coincide with each other, and a change in voltage with respect to an angle of the induction axis of the electrocardiogram waveform is displayed in a graph having a radial axis.