Blood pressure pulse wave inspection device and index image forming method

Abstract

To provide a blood pressure pulse wave inspection apparatus and an index image formation method which allow a medical worker such as a doctor to easily and correctly grasp the progress of aortic valve stenosis and the progress of left ventricular hypertrophy.SOLUTION: A blood pressure pulse wave inspection apparatus (i) forms a first straight line extending to the inner side of a triangle from a first apex of the triangle, a second straight line extending to the inner side of the triangle from a second apex of the triangle, a third straight line extending to the inner side of the triangle from a third apex of the triangle and an intersection point of the first, second and third straight lines, (ii) plots a first disease index point based on the heart sound on the first straight line, plots a second disease index point based on an electrocardiogram on the second straight line and plots a third disease index point based on a pulse wave on the third straight line with the intersection point as an original point, (iii) forms a straight line connecting the first disease index point and the second disease index point, a straight line connecting the second disease index point and the third disease index point and a straight line connecting the third disease index point and the first disease index point.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a blood pressure pulse wave inspection device and an index image forming method. [Background technology]

[0002] Aortic valve stenosis (AS) is a disease in which the aortic valve, one of the four valves in the heart that is located between the left ventricle and the aorta, becomes difficult to open due to inflammation and hardening. The number of AS patients is on the rise due to the aging population.

[0003] When the aortic valve narrows, the heart tries to overcome the narrowing and squeeze blood throughout the body, placing pressure on the left ventricle, which then becomes enlarged as a compensatory mechanism. Eventually, the left ventricle is unable to withstand the strain, leading to irreversible left ventricular dysfunction, heart failure, and sudden death.

[0004] AS can progress unnoticed, and the prognosis is poor once severe symptoms appear, so early detection and appropriate timing of surgery are essential.

[0005] Primary screening for AS is primarily performed by auscultation of the heart (the systolic murmur specific to AS).

[0006] If a doctor is unable to make a diagnosis based on a heart murmur, they will palpate the pulse (delay in the onset of the pulse wave) or perform an electrocardiogram. If these tests reveal any abnormalities, a detailed echocardiogram will be performed to make a definitive diagnosis and determine the severity of the condition.

[0007] However, experience is required for a doctor to perform cardiac auscultation accurately. Patent Document 1 discloses a technique for determining systolic murmurs using an electrocardiogram and a phonocardiogram. It is believed that this technique can automatically detect cardiac murmurs that may indicate diseases such as aortic valve stenosis, even if the doctor has no experience. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-169615 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-168074 Summary of the Invention [Problem to be solved by the invention]

[0009] As mentioned above, doctors determine the possibility of AS by auscultating the heart sounds. However, systolic murmurs may also be heard in addition to AS, and it is particularly important to distinguish between senile systolic murmurs (systolic murmurs often heard in elderly people without valvular disease) and mitral regurgitation.

[0010] When cardiologists are unsure of the diagnosis, they screen for AS by taking a comprehensive assessment, including pulse diagnosis and electrocardiogram findings. For inexperienced doctors and non-cardiologists, auscultation alone is difficult, and the difficulty increases even more when it comes to making a comprehensive assessment. This can lead to AS being overlooked, potentially preventing early detection.

[0011] The present invention has been made in consideration of the above points, and provides a blood pressure pulse wave examination device and an index image formation method that allow medical professionals such as doctors to easily and accurately grasp the progression of aortic valve stenosis and left ventricular hypertrophy. [Means for solving the problem]

[0012] One aspect of the blood pressure pulse wave inspection device of the present invention is a heart sound acquisition unit for acquiring the heart sound of the subject; an electrocardiogram acquisition unit for acquiring an electrocardiogram of the subject; a pulse wave acquiring unit for acquiring a pulse wave of the subject; an index image output unit that uses the heart sounds, the electrocardiogram, and the pulse wave to present an index image for determining cardiac disease; and The index image output unit (i) forming a first line extending from a first vertex of a triangle toward the inside of the triangle, a second line extending from a second vertex of the triangle toward the inside of the triangle, a third line extending from a third vertex of the triangle toward the inside of the triangle, and an intersection of the first, second, and third lines; (ii) plotting a first disease index point based on the heart sounds on the first straight line, a second disease index point based on the electrocardiogram on the second straight line, and a third disease index point based on the pulse wave on the third straight line, using the intersection point as an origin; (iii) forming a straight line connecting the first disease index point and the second disease index point, a straight line connecting the second disease index point and the third disease index point, and a straight line connecting the third disease index point and the first disease index point;

[0013] One embodiment of the index image forming method of the present invention comprises: forming a first line extending from a first vertex of the triangle toward the inside of the triangle, a second line extending from a second vertex of the triangle toward the inside of the triangle, a third line extending from a third vertex of the triangle toward the inside of the triangle, and an intersection of the first, second, and third lines; Using the intersection point as an origin, plotting a first disease index point based on a heart sound on the first straight line, plotting a second disease index point based on an electrocardiogram on the second straight line, and plotting a third disease index point based on a pulse wave on the third straight line; forming a straight line connecting the first disease index point and the second disease index point, a straight line connecting the second disease index point and the third disease index point, and a straight line connecting the third disease index point and the first disease index point; Includes: [Effects of the Invention]

[0014] According to the present invention, it becomes possible for medical professionals such as doctors to easily and accurately grasp the progression of aortic valve stenosis and left ventricular hypertrophy. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a diagram showing the overall configuration of a blood pressure pulse wave inspection device according to an embodiment. [Figure 2] FIG. 1 is a diagram illustrating the creation of an index image. [Figure 3] FIG. 10 is a diagram showing an example of an index image formed by the embodiment; [Figure 4] FIG. 10 is a diagram showing an example of an index image formed by the embodiment. [Figure 5] FIG. 10 is a diagram showing an example of an index image formed by the embodiment; [Figure 6] Diagram for explaining IUT DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0017] <1> Overall configuration of blood pressure pulse wave inspection device FIG. 1 is a diagram showing the overall configuration of a blood pressure pulse wave inspecting device according to an embodiment of the present invention.

[0018] In FIG. 1, the main body 1a of the blood pressure pulse wave inspection device 1 is provided with an arithmetic processing unit 10, an input unit 70, a display unit 80, a printing unit 91, a memory unit 92, an audio output unit 93, a blood pressure pulse wave measuring unit 30, a heart sound measuring unit 40, an electrocardiogram measuring unit 50, and a pulse wave measuring unit 60.

[0019] The blood pressure pulse wave measurement unit 30 has an upper arm measurement control unit 31 and a lower limb measurement control unit 32. A right upper arm cuff 21R and a left upper arm cuff 21L are connected to the upper arm measurement control unit 31 via hoses 21h, and a right ankle cuff 22R and a left ankle cuff 22L are connected to the lower limb measurement control unit 32 via hoses 22h.

[0020] A heart sound microphone 23 is connected to the heart sound measurement unit 40. A four limb electrocardiogram electrode unit 24a and a chest electrocardiogram electrode unit 24b are connected to the electrocardiogram measurement unit 50. Amorphous pulse wave sensors 25a and 25b are connected to the pulse wave measurement unit 60.

[0021] The calculation processing unit 10 is a computer having a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), various interfaces, etc. The calculation control unit 10 executes a control program stored in the ROM with the CPU, thereby performing calculation processing of indices for determining heart disease, which will be described below.

[0022] In addition, the calculation processing unit 10 controls the upper arm measurement control unit 31, the lower limb measurement control unit 32, the heart sound measurement unit 40, the electrocardiogram measurement unit 50, and the pulse wave measurement unit 60 (hereinafter referred to as "each biological information measurement unit"), which measure various types of biological information.

[0023] The arithmetic processing unit 10 also receives biological information supplied from each biological information measurement unit. When the received biological information needs to be displayed on a screen, it edits or converts it into display data and outputs it to the display unit 80, and when it needs to be printed on a report form, it edits or converts it into print data and outputs it to the printing unit 91. The arithmetic processing unit 10 also stores the received biological information in the storage unit 92 and reads out the stored biological information as appropriate.

[0024] The calculation processing unit 10 also performs waveform analysis of the biological information received from each biological information measurement unit. In the waveform analysis, characteristic parts (dividing points) in the waveform are detected. Examples of characteristic parts include the start of the second heart sound, the rising edge of the pulse wave at the upper arm, the rising edge of the pulse wave at the ankle, and the notch of the pulse wave at the upper arm.

[0025] The arithmetic processing unit 10 calculates the degree of arteriosclerosis based on the analysis result and the value (for example, blood pressure) indicated by the received biological information.

[0026] In addition, the calculation processing unit 10 receives inputs and instructions from the input unit 70 through user operations, and in accordance with the received contents, performs settings related to the functions of each biometric information measurement unit, display unit 80, printing unit 91, memory unit 92 and audio output unit 93, and controls the start and stop of each operation.

[0027] The display unit 80 is a display device having a display screen such as an LCD (Liquid Crystal Display), and displays on the screen the biological information, analysis results, arteriosclerosis degree, etc. input from the arithmetic processing unit 10 as display data.

[0028] The printing unit 91 has as its main components a paper feed mechanism, a printing head, etc., and prints on paper the biological information, analysis results, and arteriosclerosis degree input as printing data from the arithmetic processing unit 10.

[0029] The storage unit 92 is configured with a hard disk drive, a writable optical disk drive, a nonvolatile memory, etc., and is capable of storing information from the processing unit 10.

[0030] The audio output unit 93 has a speaker or the like as a main component, and outputs a guidance voice, an alert sound, or the like in accordance with the guidance data or an alert sound output instruction signal input from the calculation processing unit 10.

[0031] The input unit 70 is composed of a keyboard, a mouse, buttons, a touch panel, etc., and receives inputs and instructions from the user and sends them to the arithmetic processing unit 10.

[0032] Pulse wave measuring unit 60 supplies the subject's pulse wave signals detected by amorphous pulse wave sensors 25a, 25b appropriately attached to the subject to calculation processing unit 10. This allows measurement and analysis of the pulse wave. Note that one of amorphous pulse wave sensors 25a, 25b is attached, for example, to the subject's carotid artery, and the other is attached, for example, to the subject's femoral artery or knee.

[0033] In this embodiment, the blood pressure pulse wave measuring unit 30 is configured by providing an upper limb measurement control unit 31 and a lower limb measurement control unit 32 independently, but the upper limb measurement control unit 31 and the lower limb measurement control unit 32 may be integrated together. For measuring blood pressure pulse waves by the blood pressure pulse wave measuring unit 30 having the upper limb measurement control unit 31 and the lower limb measurement control unit 32, known technology such as that described in Patent Document 2 may be used, and therefore detailed description thereof will be omitted here.

[0034] The electrocardiogram measurement unit 50 supplies electrocardiogram signals detected by the four limb electrocardiogram electrodes 24a and the chest electrocardiogram electrodes 24b attached to the subject to the arithmetic processing unit 10. This allows electrocardiogram measurement and analysis. The four limb electrocardiogram electrodes 24a typically consist of four electrocardiogram electrodes attached to the right wrist, left wrist, right ankle, and left ankle, respectively. The electrocardiogram electrodes for both ankles are preferably configured so that their attachment to both ankles is not obstructed by the right ankle cuff 22R and the left ankle cuff 22L. The chest electrocardiogram electrode unit 25b typically consists of six electrocardiogram electrodes attached to six locations on the chest.

[0035] The heart sound measurement unit 40 supplies a heart sound signal detected by the heart sound microphone 23 attached to the subject to the calculation processing unit 10. In this way, the heart sounds are measured and analyzed.

[0036] <2> Indicator image according to this embodiment In this embodiment, we propose a new index image that allows easy and accurate understanding of the progression of aortic valve stenosis and left ventricular hypertrophy. Figure 2 is a diagram illustrating the creation of the new index image. Figures 3 to 5 are diagrams showing the new index image. In practice, this index image is formed by the calculation processing unit 10 and output to the display unit 80, printing unit 91, and storage unit 92.

[0037] By looking at this index image, medical professionals such as doctors can understand the progression of aortic valve stenosis and left ventricular hypertrophy. Note that the index images shown in Figures 3 to 5 may be displayed on the display unit 80, printed by the printing unit 81, or stored in the memory unit 92.

[0038] 3 to 5 are actually formed by the arithmetic processing unit 10 using the subject's heart sounds measured by the heart sound measurement unit 40, the subject's electrocardiogram measured by the electrocardiogram measurement unit 50, and the subject's blood pressure pulse wave (hereinafter sometimes simply referred to as "pulse wave") measured by the blood pressure pulse wave measurement unit 30. The arithmetic processing unit 10 functions as an index image output unit.

[0039] The creation of the index image in this embodiment will be described in detail with reference to FIG.

[0040] The calculation processing unit 10 forms a first straight line L1 extending from the first vertex of the triangle toward the inside of the triangle, a second straight line L2 extending from the second vertex of the triangle toward the inside of the triangle, a third straight line L3 extending from the third vertex of the triangle toward the inside of the triangle, and an intersection C0 of the first, second, and third straight lines L1, L2, and L3.

[0041] In this embodiment, the triangle is an equilateral triangle, and the intersection point C0 is the center of gravity of the equilateral triangle. However, the triangle does not have to be an equilateral triangle, and the intersection point C0 does not have to be the center of gravity. The shape of the triangle and the direction of the straight line can be changed as needed.

[0042] Next, the calculation processing unit 10 forms an index image using the actually measured heart sounds, electrocardiogram, and pulse wave.

[0043] As shown in FIG. 3, the calculation processing unit 10 plots a first disease index point P1 based on heart sounds on a first straight line L1, a second disease index point P2 based on an electrocardiogram on a second straight line L2, and a third disease index point P3 based on a pulse wave on a third straight line L3, with the intersection point C0 as the origin.

[0044] Next, the calculation processing unit 10 forms a straight line L12 connecting the first disease index point P1 and the second disease index point P2, a straight line L23 connecting the second disease index point P2 and the third disease index point P3, and a straight line L31 connecting the third disease index point P3 and the first disease index point P1.

[0045] This visually forms a first triangular area A1 consisting of the intersection point C0, the first disease index point P1, and the second disease index point P2, a second triangular area A2 consisting of the intersection point C0, the second disease index point P2, and the third disease index point P3, and a third triangular area A3 consisting of the intersection point C0, the third disease index point P3, and the first disease index point P1.

[0046] In this embodiment, the first, second, and third triangular regions A1, A2, and A3 are displayed with different colors or patterns, allowing medical personnel to easily compare the sizes of the first, second, and third triangular regions A1, A2, and A3.

[0047] As described above, the location of the first disease index point P1 is selected based on the heart sounds, the location of the second disease index point P2 is selected based on the electrocardiogram, and the location of the third disease index point P3 is selected based on the pulse wave.

[0048] A more specific explanation will be given below. The first disease index point P1 is plotted based on the systolic murmur. Here, it can be said that the louder the murmur between the first and second heart sounds, i.e., the louder the systolic murmur, the more advanced the aortic valve stenosis. Taking this into consideration, in this embodiment, the calculation processing unit 10 plots the first disease index point P1 at a position farther from the intersection point C0 as the systolic murmur becomes louder.

[0049] The second disease index point P2 is plotted based on a left ventricular hypertrophy index, such as Cornell voltage, Cornell product, or Sokolow-Lyon voltage, in an electrocardiogram. It can be said that the greater the value of Cornell voltage, Cornell product, or Sokolow-Lyon voltage in an electrocardiogram, the more advanced the left ventricular hypertrophy. Taking this into consideration, in this embodiment, the calculation processing unit 10 plots the second disease index point P2 at a position farther from the intersection point C0 as the value of Cornell voltage, Cornell product, or Sokolow-Lyon voltage increases.

[0050] Cornell Voltage, Cornell Product, and Sokolow-Lyon Voltage are well-known indicators and will be explained briefly below. Cornell Voltage is the value of R amplitude (aVL) + S amplitude (V3) on an electrocardiogram. Cornell Product is the value of {R amplitude (aVL) + S amplitude (V3)} × QRS width. Sokolow-Lyon Voltage is the value of S amplitude (V1) + R amplitude (V5 or V6).

[0051] The third disease index point P3 is plotted based on the rising edge of the pulse wave. Here, in the pulse wave (more precisely, the blood pressure pulse wave), the flatter the rising edge of the pulse wave, the more advanced the disease of the aortic valve or blood vessels. Taking this into consideration, in this embodiment, the calculation processing unit 10 plots the third disease index point P3 at a position farther from the intersection point C0 as the rising edge of the pulse wave flattens.

[0052] In this embodiment, the initial upstroke time (IUT) of the pulse wave is used as an index to indicate how flat the rising edge of the pulse wave is. As shown in Fig. 6, the IUT is the time it takes for a tangent drawn to the ascending limb at the beginning of the rising edge of the pulse wave to reach its peak. Therefore, it can be said that the larger the IUT, the flatter the rising edge of the pulse wave.

[0053] Here, the intersection C0 can be said to be the origin in relation to the first to third disease index points P1 to P3, and if there are no abnormalities in the heart sounds, electrocardiogram, or pulse wave, the first to third disease index points P1 to P3 will each be plotted at the origin. Conversely, the greater the abnormality in the heart sounds, electrocardiogram, or pulse wave, the farther the first to third disease index points P1 to P3 will each be plotted from the origin.

[0054] In Figure 3, the larger the first triangular area A1, the more advanced the aortic valve disease and left ventricular hypertrophy. The larger the second triangular area A2, the more advanced the vascular disease and left ventricular hypertrophy. The larger the third triangular area A3, the more advanced the aortic valve disease and vascular disease.

[0055] Therefore, by looking at the index image of FIG. 3, medical professionals such as doctors can easily and accurately grasp the progression of aortic valve stenosis and left ventricular hypertrophy.

[0056] 3, the first to third triangular areas A1 to A3 are all large. From this image, medical personnel can determine that aortic valve stenosis is progressing and left ventricular hypertrophy is also progressing.

[0057] In contrast, in the index image of Figure 4, the third triangular area A3 is large, but the first and second triangular areas A1 and A2 are small. From this image, medical professionals can determine that aortic valve stenosis is suspected, but left ventricular hypertrophy has not progressed.

[0058] In addition, in the index image of Figure 5, the second triangular area A2 is large, but the first and third triangular areas A1 and A3 are almost nonexistent. From such an image, medical professionals can determine that there is no aortic valve stenosis, but that vascular disease such as arteriosclerosis and left ventricular hypertrophy are progressing.

[0059] As described above, according to this embodiment, the blood pressure pulse wave inspection device 10 (i) forms a first straight line L1 extending from the first vertex of the triangle toward the inside of the triangle, a second straight line L2 extending from the second vertex of the triangle toward the inside of the triangle, a third straight line L3 extending from the third vertex of the triangle toward the inside of the triangle, and an intersection C0 of the first, second, and third straight lines L1 to L3, and (ii) forms a heart sound-based line on the first straight line L1 with the intersection C0 as the origin. (iii) plotting a first disease index point P1, a second disease index point P2 based on an electrocardiogram on a second straight line L2, and a third disease index point P3 based on a pulse wave on a third straight line L3; and forming a straight line L12 connecting the first disease index point P1 and the second disease index point P2, a straight line L23 connecting the second disease index point P2 and the third disease index point P3, and a straight line L31 connecting the third disease index point P3 and the first disease index point P1.

[0060] This allows medical professionals such as doctors to easily and accurately grasp the progression of aortic valve stenosis and left ventricular hypertrophy from the areas of the triangular regions A1, A2, and A3.

[0061] Furthermore, according to the index image of this embodiment, by looking at the balance of the triangle formed within the original large triangle (the triangle formed by connecting the disease index points P1, P2, and P3), it becomes possible to quickly and intuitively grasp the complex balance of the progression of aortic valve stenosis, the progression of left ventricular hypertrophy, and the progression of vascular disease.

[0062] The above-described embodiments are merely examples of specific embodiments of the present invention, and the technical scope of the present invention should not be construed as being limited by these embodiments. In other words, the present invention can be embodied in various forms without departing from the gist or main characteristics thereof.

[0063] In addition to the above-described embodiment, the calculation processing unit 10 as an index image output unit may calculate the area of ​​each of the triangular regions A1, A2, and A3, and output the area to the display unit 80, the printing unit 91, and the storage unit 92. The calculation processing unit 10 may also calculate the sum of the areas of the triangular regions A1, A2, and A3, and output the sum to the display unit 80, the printing unit 91, and the storage unit 92.

[0064] Although a blood pressure pulse wave inspection device is originally intended to evaluate arteriosclerosis and arterial blockage, the blood pressure pulse wave inspection device 10 of this embodiment can also evaluate the progression of aortic valve stenosis and left ventricular hypertrophy by calculating the areas of the triangular areas A1, A2, and A3 and their sum.

[0065] In the above embodiment, the third disease index point P3 is plotted based on the IUT, but the present invention is not limited to this, and the third disease index point P3 may be plotted based on, for example, the CAVI (Cardio Ankle Vascular Index). Specifically, the larger the CAVI value, the greater the distance from the intersection point C0 at which the third disease index point P3 is plotted.

[0066] Furthermore, in the above-described embodiment, the index image is formed and displayed by a blood pressure pulse wave inspection device, but the index image forming method according to the present invention may also be realized by a device (such as a personal computer) separate from the blood pressure pulse wave inspection device.

[0067] That is, the index image forming method of the present invention may include the steps of: forming a first line extending from a first vertex of a triangle inwardly of the triangle, a second line extending from a second vertex of the triangle inwardly of the triangle, a third line extending from a third vertex of the triangle inwardly of the triangle, and an intersection point of the first, second, and third lines; plotting first disease index points based on heart sounds on the first line, plotting second disease index points based on an electrocardiogram on the second line, and plotting third disease index points based on a pulse wave on the third line, with the intersection point as the origin; and forming a line connecting the first disease index points and the second disease index points, a line connecting the second disease index points and the third disease index points, and a line connecting the third disease index points and the first disease index points. [Industrial Applicability]

[0068] The present invention is widely applicable to a blood pressure pulse wave inspection device capable of acquiring heart sounds, electrocardiograms, and blood pressure pulse waves, and to an index image forming method for forming an index image from heart sounds, electrocardiograms, and blood pressure pulse waves. [Explanation of symbols]

[0069] 1. Blood pressure pulse wave testing device 10. Processing unit 30 Blood pressure pulse wave measurement unit 40 Heart sound measurement unit 50 Electrocardiogram measurement unit 80 Display section 91 Printing section 92 Memory section A1, A2, A3 triangular area C0 intersection (origin) L1, L2, L3, L12, L23, L31 Straight line P1, P2, P3 disease index points

Claims

1. a heart sound acquisition unit for acquiring the heart sound of the subject; an electrocardiogram acquisition unit for acquiring an electrocardiogram of the subject; a pulse wave acquiring unit for acquiring a pulse wave of the subject; an index image output unit that uses the heart sounds, the electrocardiogram, and the pulse wave to present an index image for determining cardiac disease; and The index image output unit (i) forming a first line extending from a first vertex of a triangle toward the inside of the triangle, a second line extending from a second vertex of the triangle toward the inside of the triangle, a third line extending from a third vertex of the triangle toward the inside of the triangle, and an intersection of the first, second, and third lines; (ii) plotting a first disease index point based on the heart sounds on the first straight line, a second disease index point based on the electrocardiogram on the second straight line, and a third disease index point based on the pulse wave on the third straight line, using the intersection point as an origin; (iii) forming a straight line connecting the first disease index point and the second disease index point, a straight line connecting the second disease index point and the third disease index point, and a straight line connecting the third disease index point and the first disease index point; (iv) each of the distances from the origin to the first disease index point, the second disease index point, and the third disease index point represents a degree of abnormality; Blood pressure pulse wave testing device.

2. A heart sound acquisition unit that acquires the heart sound of a subject; an electrocardiogram acquisition unit for acquiring an electrocardiogram of the subject; a pulse wave acquiring unit for acquiring a pulse wave of the subject; an index image output unit that uses the heart sounds, the electrocardiogram, and the pulse wave to present an index image for determining cardiac disease; and The index image output unit (i) forming a first line extending from a first vertex of a triangle toward the inside of the triangle, a second line extending from a second vertex of the triangle toward the inside of the triangle, a third line extending from a third vertex of the triangle toward the inside of the triangle, and an intersection of the first, second, and third lines; (ii) plotting a first disease index point based on the heart sounds on the first straight line, a second disease index point based on the electrocardiogram on the second straight line, and a third disease index point based on the pulse wave on the third straight line, using the intersection point as an origin; (iii) forming a straight line connecting the first disease index point and the second disease index point, a straight line connecting the second disease index point and the third disease index point, and a straight line connecting the third disease index point and the first disease index point; (iv) imparting different colors or patterns to a first triangular region formed by the intersection point, the first disease index point, and the second disease index point, a second triangular region formed by the intersection point, the second disease index point, and the third disease index point, and a third triangular region formed by the intersection point, the third disease index point, and the first disease index point, respectively; Blood pressure pulse wave testing device.

3. A heart sound acquisition unit that acquires the heart sound of a subject; an electrocardiogram acquisition unit for acquiring an electrocardiogram of the subject; a pulse wave acquiring unit for acquiring a pulse wave of the subject; an index image output unit that uses the heart sounds, the electrocardiogram, and the pulse wave to present an index image for determining cardiac disease; and The index image output unit (i) forming a first line extending from a first vertex of a triangle toward the inside of the triangle, a second line extending from a second vertex of the triangle toward the inside of the triangle, a third line extending from a third vertex of the triangle toward the inside of the triangle, and an intersection of the first, second, and third lines; (ii) plotting a first disease index point based on the heart sounds on the first straight line, a second disease index point based on the electrocardiogram on the second straight line, and a third disease index point based on the pulse wave on the third straight line, using the intersection point as an origin; (iii) forming a straight line connecting the first disease index point and the second disease index point, a straight line connecting the second disease index point and the third disease index point, and a straight line connecting the third disease index point and the first disease index point; (iv) calculating and outputting an area of ​​a first triangle formed by the intersection point, the first disease index point, and the first disease index point, an area of ​​a second triangle formed by the intersection point, the second disease index point, and the third disease index point, and an area of ​​a third triangle formed by the intersection point, the third disease index point, and the first disease index point; Blood pressure pulse wave testing device.

4. the index image output unit further calculates and outputs a sum of the areas of the first, second, and third triangles.

4. The blood pressure pulse wave inspection device according to claim 3.

5. The first disease index point is based on a systolic murmur. The blood pressure pulse wave inspection device according to any one of claims 1 to 4.

6. The index image output unit forming a first triangular area consisting of the intersection point, the first disease index point, and the second disease index point, a second triangular area consisting of the intersection point, the second disease index point, and the third disease index point, and a third triangular area consisting of the intersection point, the third disease index point, and the first disease index point; each of the first triangular area, the second triangular area, and the third triangular area is an indicator of a disease progression state; The blood pressure pulse wave inspection device according to any one of claims 1 to 5.

7. forming a first line extending from a first vertex of a triangle into the triangle, a second line extending from a second vertex of the triangle into the triangle, a third line extending from a third vertex of the triangle into the triangle, and an intersection of the first, second, and third lines; plotting a first disease index point based on a heart sound on the first straight line, a second disease index point based on an electrocardiogram on the second straight line, and a third disease index point based on a pulse wave on the third straight line, using the intersection point as an origin; forming a straight line connecting the first disease index point and the second disease index point, a straight line connecting the second disease index point and the third disease index point, and a straight line connecting the third disease index point and the first disease index point; Including, each of the distances from the origin to the first disease index point, the second disease index point, and the third disease index point represents a degree of abnormality; Index image forming method.

8. A step of forming a first line extending from a first vertex of a triangle toward the inside of the triangle, a second line extending from a second vertex of the triangle toward the inside of the triangle, a third line extending from a third vertex of the triangle toward the inside of the triangle, and an intersection of the first, second, and third lines; plotting a first disease index point based on a heart sound on the first straight line, a second disease index point based on an electrocardiogram on the second straight line, and a third disease index point based on a pulse wave on the third straight line, using the intersection point as an origin; forming a straight line connecting the first disease index point and the second disease index point, a straight line connecting the second disease index point and the third disease index point, and a straight line connecting the third disease index point and the first disease index point; a step of assigning different colors or patterns to a first triangular region constituted by the intersection point, the first disease index point, and the second disease index point, a second triangular region constituted by the intersection point, the second disease index point, and the third disease index point, and a third triangular region constituted by the intersection point, the third disease index point, and the first disease index point; A method for forming an index image comprising:

9. A step of forming a first line extending from a first vertex of a triangle toward the inside of the triangle, a second line extending from a second vertex of the triangle toward the inside of the triangle, a third line extending from a third vertex of the triangle toward the inside of the triangle, and an intersection of the first, second, and third lines; plotting a first disease index point based on a heart sound on the first straight line, a second disease index point based on an electrocardiogram on the second straight line, and a third disease index point based on a pulse wave on the third straight line, using the intersection point as an origin; forming a straight line connecting the first disease index point and the second disease index point, a straight line connecting the second disease index point and the third disease index point, and a straight line connecting the third disease index point and the first disease index point; calculating and outputting an area of ​​a first triangle formed by the intersection point, the first disease index point, and the first disease index point, an area of ​​a second triangle formed by the intersection point, the second disease index point, and the third disease index point, and an area of ​​a third triangle formed by the intersection point, the third disease index point, and the first disease index point; A method for forming an index image comprising:

Images