The present invention relates to a method, apparatus, and program for outputting an index.
As an index for diagnosing stenosis or occlusion of a blood vessel due to arterial sclerosis, the ABI (Ankel-Brachial pressure Index) which is a ratio of the systolic blood pressures of the upper arm and the ankle joint (ankle) is used. Generally, the blood pressure of the lower limb is higher than that of the upper limb. Therefore, the value of the ABI is often larger than 1.0. In the case where the value of the ABI is larger than 0.9 and smaller than 1.4, usually, it is determined that the condition of a blood vessel is normal, and, in the case where the value of the ABI is equal to or smaller than 0.9, it is determined that there is suspicion of stenosis or occlusion of a blood vessel. JP-A-2006-314613 discloses a technique for diagnosing the condition of a blood vessel in consideration of the ABI, a ratio of pulse pressures (hereinafter, referred to as ppABI), and a ratio of mean blood pressures (hereinafter, referred to as mABI).
In the case where calcification of a blood vessel is caused to occur by progress of arterial sclerosis, dialytic treatment of diabetes, or the like, however, the systolic blood pressure, the mean blood pressure, and the pulse pressure cannot be appropriately measured. In the technique disclosed in JP-A-2006-314613, therefore, there is a problem in that, in such a case, the condition of a blood vessel cannot be adequately determined.
Firstly, the systolic blood pressure by using oscillometric method is acquired based on the maximum value of a pulse wave amplitude in the case where the mean blood pressure is acquired. Specifically, a pulse wave amplitude having a magnitude which is obtained by subtracting a predetermined rate from the maximum value of a pulse wave amplitude is calculated as the pulse wave amplitude at the systolic blood pressure. The predetermined rate can be adequately set as a value according to various conditions such as the configuration of a measuring device, and the measurement environment. After a pulse wave amplitude which varies in accordance with the change of the cuff pressure shows the maximum value, the cuff pressure at a timing when the pulse wave amplitude is lowered to the pulse wave amplitude at the calculated systolic blood pressure is acquired as the systolic blood pressure.
In the case where calcification of a blood vessel occurs, the flexibility and elasticity of the blood vessel are impaired, and, even when the blood vessel is compressed by pressurization of the cuff, there is hence a case where the blood vessel is not completely closed. In this case, even when the cuff pressure is raised, a state where the pulse wave amplitude is high is maintained, and the cuff pressure at which the pulse wave amplitude at the systolic blood pressure is detected is increased. As a result, the systolic blood pressure is measured as a value which is larger than the true value. In the case where calcification progresses in a blood vessel of the lower limb, therefore, the systolic blood pressure of the lower limb is measured as a value which is larger than the true value, and also the value of the ABI is calculated as a value which is larger than the true value. Consequently, the condition of the blood vessel cannot be adequately determined by using the ABI, and this is problematic. The pulse pressure is the deference between the systolic blood pressure and the diastolic blood pressure. In the case where the systolic blood pressure cannot be adequately measured as described above, therefore, also the pulse pressure cannot be adequately acquired, and similarly this is problematic.
Similarly with the measurement of the systolic blood pressure, for example, the cuff is pressurized and then depressurized, and the mean blood pressure is measured as the cuff pressure at a timing when the pulse wave amplitude is maximum. In the case where calcification of a blood vessel occurs, the flexibility and elasticity of the blood vessel are impaired, and, even when the cuff pressure is lowered, there is hence a case where the pulse wave amplitude does not form a distinct peak, and remains in the vicinity of the maximum value. In this case, it is difficult to determine the timing at which the cuff pressure is acquired as the mean blood pressure, and there is a possibility that the value of the mean blood pressure is not adequately acquired. Consequently, the condition of the blood vessel cannot be adequately determined by using the mABI, and this is problematic.
The invention has been conducted in view of the above-discussed circumstances. It is an object of the invention to provide a method, apparatus, and program for outputting an index for adequately determining the condition of a blood vessel even in the case where calcification of the blood vessel occurs.
The object is achieved by the following means.
The method for outputting an index for determining a condition of a blood vessel has an acquiring step, a calculating step, and an outputting step. In the acquiring step, a diastolic blood pressure is acquired for each of upper and lower limbs of the living body. In the calculating step, a ratio of the diastolic blood pressure of the lower limb to the diastolic blood pressure of the upper limb is calculated, the diastolic blood pressure of the lower limb and the diastolic blood pressure of the upper limb being acquired in the acquiring step. In the outputting step, the ratio of the diastolic blood pressures which is calculated in the calculating step is output.
The apparatus for outputting an index for determining a condition of a blood vessel has an acquiring section, a calculating section, and an outputting section. The acquiring section acquires a diastolic blood pressure for each of upper and lower limbs of the living body. The calculating section calculates a ratio of the diastolic blood pressure of the lower limb to the diastolic blood pressure of the upper limb, the diastolic blood pressure of the lower limb and the diastolic blood pressure of the upper limb being acquired by the acquiring section. The outputting section outputs the ratio of the diastolic blood pressures which is calculated by the calculating section.
The program for outputting an index for determining a condition of a blood vessel causes a computer to execute an acquiring step, a calculating step, and an outputting step. In the acquiring step, a diastolic blood pressure is acquired for each of upper and lower limbs of the living body. In the calculating step, a ratio of the diastolic blood pressure of the lower limb to the diastolic blood pressure of the upper limb is calculated, the diastolic blood pressure of the lower limb and the diastolic blood pressure of the upper limb being acquired in the acquiring step. In the outputting step, the ratio of the diastolic blood pressures which is calculated in the calculating step is output.
In accordance with an embodiment of this invention, the apparatus for outputting an index calculates and outputs a ratio of the diastolic blood pressure of the lower limb to the diastolic blood pressure of the upper limb, as an index for determining the condition of a blood vessel. The ratio of diastolic blood pressures is hardly affected by calcification of a blood vessel. Even when calcification occurs, therefore, it is possible to output an index by which the condition of a blood vessel can be adequately determined. While combining the systolic blood pressure which is easily affected by calcification, and the diastolic blood pressure which is hardly affected by calcification, evaluation is performed. Therefore, it is possible to determine more correctly the degree of calcification. Moreover, stenosis/occlusion and calcification can be simultaneously determined by one measurement.
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Hereinafter, embodiments of the invention will be described with reference to the accompanying drawings. In the description of the drawings, the identical components are denoted by the same reference numerals, and duplicated description is omitted. In the drawings, the dimension ratios are exaggerated for the sake of convenience in description, and may be sometimes different from the actual ratios.
As illustrated in
The CPU 110 controls the above-mentioned components and performs various calculation processes in accordance with programs which are recorded in the ROM 120 and the storage device 140. The CPU 110 executes the programs to function as a calculating section and a determining section. The ROM 120 stores various programs and data. The RAM 130 functions as a working area to temporarily store programs and data.
The storage device 140 stores various programs including an operating system, and various data. The storage device 140 further stores various thresholds for determining the condition of a blood vessel based on indexes.
The displaying section 150 is, for example, a liquid crystal display, and displays various kinds of information such as the name of a subject, measure blood pressures, and calculated indexes.
The operating section 160 is used for performing various inputs. The operating section 160 may include operation keys which are realized as software by a touch panel on the displaying section 150, operation buttons which are disposed as hardware, and the like.
The blood pressure acquiring section 170 is connected to cuffs, probes, or the like which are used for measuring the blood pressure, and acquires blood pressure values such as the diastolic blood pressure of the subject. For example, the blood pressure acquiring section 170 acquires the diastolic blood pressure of the upper limb from a cuff which is attached to the upper arm of the subject, and that of the lower limb from a cuff which is attached to the ankle joint of the subject. The blood pressure acquiring section 170 may acquire the blood pressures of the right and left upper arms and ankle joints of the subject, or acquire those of the right or left upper arm and ankle joint. Alternatively, the blood pressure acquiring section 170 may sequentially acquire the blood pressures of measurement portions by using a single cuff, or acquire at one time the blood pressures of a plurality of measurement portions by using a plurality of cuffs. The method for acquiring blood pressures will be described in detail later.
The index outputting apparatus 100 may include components other than the above-described components, or may not include a part of the above-described components.
The thus configured index outputting apparatus 100 acquires the diastolic blood pressure of the upper limb of the living body, and that of the lower limb, and calculates and outputs a ratio of the diastolic blood pressure of the lower limb to the diastolic blood pressure of the upper limb (hereinafter, the ratio is referred to as the dABI), as an index for determining the condition of a blood vessel. Hereinafter, the function of the index outputting apparatus 100 will be described.
Firstly, a method for measuring blood pressures including the diastolic blood pressure, and advantages of the use of the dABI as an index for determining the condition of a blood vessel will be described.
In the embodiment, as illustrated in a range from the left side to the right side of the graph of
Referring to
The mean blood pressure is measured by acquiring the cuff pressure at the timing when the pulse wave amplitude is maximum. As indicated at the timing A of the graph of
The diastolic blood pressure is acquired based on the maximum value of the pulse wave amplitude at the timing when the mean blood pressure is acquired. Specifically, firstly, a pulse wave amplitude having a magnitude which is obtained by subtracting a predetermined rate from the maximum value of the pulse wave amplitude is calculated as the pulse wave amplitude at the diastolic blood pressure. The predetermined rate can be adequately set as a value according to various conditions such as the configuration of a measuring device, and the measurement environment. The cuff pressure at a timing when the pulse wave amplitude which varies in accordance with the change of the cuff pressure firstly reaches the pulse wave amplitude at the calculated diastolic blood pressure is acquired as the diastolic blood pressure. In the example of
Similarly with the diastolic blood pressure, the systolic blood pressure is acquired based on the maximum value of the pulse wave amplitude at the timing when the mean blood pressure is acquired. Specifically, a pulse wave amplitude having a magnitude which is obtained by subtracting a predetermined rate from the maximum value of the pulse wave amplitude is calculated as the pulse wave amplitude at the systolic blood pressure. The predetermined rate can be adequately set as a value according to various conditions such as the configuration of a measuring device, and the measurement environment. The cuff pressure at a timing when the pulse wave amplitude which varies in accordance with the change of the cuff pressure is lowered to the pulse wave amplitude at the calculated systolic blood pressure after the amplitude reaches the maximum value is acquired as the systolic blood pressure. In the example of
The pulse pressure is acquired as the difference between the thus obtained systolic and diastolic blood pressures.
Next, the case where blood pressures of a calcified blood vessel are measured will be described while comparing with the case where blood pressures are measured in a normal blood vessel.
Firstly, the mean blood pressure will be described. In a normal blood vessel, as indicated at the timing C of
Next, the systolic blood pressure will be described. In a normal blood vessel, when the cuff pressure is raised in order to measure the systolic blood pressure, as indicated in the range from the timing C to the timing E of
With respect to the diastolic blood pressure, as illustrated in
The abscissa in
In
The portion of the abscissa in which the value is zero shows a state where the internal and external pressures of a blood vessel are equal to each other, and the blood pressure which is measured in this state is the mean blood pressure. The difference between the internal and external pressures of a blood vessel is continually changed by pulsation. In the state where the value of the abscissa is zero, therefore, the difference between the actual internal and external pressures is continually changed within a range indicated by the thick lines and the double-headed arrow, and the average is zero. In the case where the internal pressure of a blood vessel is caused to be high by pulsation, for example, the difference between the internal and external pressures has a value indicated by the right thick line, and also the vessel volume has correspondingly a large value. In the case where the internal pressure of a blood vessel is caused to be low by pulsation, by contrast, the difference between the internal and external pressures has a value indicated by the left thick line, and also the vessel volume has correspondingly a small value.
As shown by the curve of the solid line in
As shown by the curve of the broken line in
In the right side of the graph in which the cuff pressure is close to the diastolic blood pressure, also in the case of a calcified blood vessel, the inclination of the curve is small and approximately equal to the inclination in the case of a normal blood vessel. Namely, it is shown that, in the state where the cuff pressure is close to the systolic blood pressure, in a calcified blood vessel and a normal blood vessel, the difference in the change rate of the vessel volume is small, and that in blood vessel behavior is small. Also in a calcified blood vessel, in the state where the cuff pressure is close to the diastolic blood pressure, therefore, the blood pressure is hardly affected by calcification, and the blood vessel exhibits behavior similar to that of a normal blood vessel. When the dABI is used as an index for determining the condition of a blood vessel, also in a calcified blood vessel, consequently, the condition of a blood vessel can be adequately determined in a similar manner as in a normal blood vessel.
Next, the procedures of processes in the index outputting apparatus 100 of the first embodiment will be described.
Firstly, the index outputting apparatus 100 controls the blood pressure acquiring section 170 to acquire the diastolic blood pressures of the upper and lower limbs of the subject (step S101). Specifically, the index outputting apparatus 100 acquires the diastolic blood pressures of the upper and lower limbs of the subject from measuring devices such as cuffs attached to the upper arm, ankle joint, and the like of the subject. The index outputting apparatus 100 may acquire the diastolic blood pressures of the right and left upper and lower limbs, or acquire those of the right or left upper and lower limbs. The index outputting apparatus 100 stores the acquired diastolic blood pressures of the upper and lower limbs in the storage device 140.
Then, the index outputting apparatus 100 calculates the dABI (step S102). Specifically, the index outputting apparatus 100 calculates the dABI by using the diastolic blood pressures of the upper and lower limbs which are acquired in the process of step S101. The index outputting apparatus 100 stores the calculated dABI in the storage device 140.
Then, the index outputting apparatus 100 outputs the dABI (step S103). Specifically, the index outputting apparatus 100 displays the dABI which is stored in the storage device 140 in the process of step S102, on a screen such as illustrated in
Then, the index outputting apparatus 100 determines the condition of a blood vessel based on the dABI (step S104). Specifically, the index outputting apparatus 100 compares the dABI which is stored in the storage device 140 in step S102, with the predetermined threshold which is previously stored in the storage device 140, thereby determining the condition of a blood vessel. The index outputting apparatus 100 displays the result of the determination on the displaying section 150. As the predetermined threshold used in the determination of the condition of a blood vessel, similarly with the known determination method using the dABI, the two values of 0.9 and 1.4 may be used as first and second thresholds. In this case, when the dABI is equal to or smaller than 0.9, it is determined that there is a possibility of stenosis or occlusion. When the dABI is larger than 0.9 and smaller than 1.4, it is determined that the condition is normal. When the dABI is equal to or larger than 1.4, it is determined that there is a possibility of an abnormality such as calcification. Alternatively, considering the tendency that the dABI has a value smaller than the ABI, values which are slightly smaller than 0.9 and 1.4, respectively, such as 0.8 and 1.3 may be set. In the alternative, when the dABI is equal to or smaller than 0.8, it is determined that there is a possibility of stenosis or occlusion. When the dABI is larger than 0.8 and smaller than 1.3, it is determined that the condition is normal. When the dABI is equal to or larger than 1.3, it is determined that there is a possibility of an abnormality such as calcification. The values and numbers of the thresholds are not limited to those of the above-described examples. While values and numbers which are obtained by experiments and calculations are adequately set, the condition of a blood vessel may be determined. When the determination is performed while the number of thresholds is increased, the determination can be performed in a larger multistage and detailed manner.
In the example illustrated in
As described above, according to the index outputting apparatus 100 of the first embodiment, the dABI is calculated while the diastolic blood pressures of the upper and lower limbs of the living body are acquired, and the calculated dABI is output as an index for determining the condition of a blood vessel. The dABI is hardly affected by calcification of a blood vessel. Even when calcification occurs, therefore, it is possible to output an index from which the condition of a blood vessel can be adequately determined. When the user checks the dABI, for example, it is therefore possible to adequately determine the condition of a blood vessel even in the case where calcification occurs.
Moreover, the index outputting apparatus 100 determines the condition of the blood vessel of the living body based on the dABI. Therefore, the user can easily know the condition of the blood vessel. The condition of a blood vessel is automatically determined based on the calculated dABI, and therefore a necessary procedure in the next step can be automatically performed based on the determination result.
Moreover, the index outputting apparatus 100 determines the condition of a blood vessel by determining whether the dABI is equal to or smaller than the first threshold or equal to or larger than the second threshold. Therefore, it is possible to adequately determine whether there is an abnormality such as stenosis or occlusion in a blood vessel or not.
Moreover, the index outputting apparatus 100 displays the dABI. When the user checks the display, therefore, the user can easily know the condition of a blood vessel.
Moreover, the index outputting apparatus 100 employs the pressure raising method in which the cuff pressure is gradually raised from the state where the pressure is zero, as the method for measuring a blood pressure. In the embodiment, the diastolic blood pressure can be acquired at the timing when the mean blood pressure is acquired, and the condition of a blood vessel can be determined based on the dABI. Therefore, the cuff pressure is requested only to be raised to a value similar to the internal pressure of a blood vessel, and not required to be raised more than necessary. Also with respect to a subject in whom, for example, calcification occurs in the blood vessel and hence the blood vessel is easily broken, therefore, the condition of the blood vessel can be safely determined without imposing a load more than necessary to the blood vessel.
Moreover, the index outputting apparatus 100 outputs the dABI as an index for determining the condition of a blood vessel. It is found that, as compared with the systolic blood pressure, the diastolic blood pressure exhibits a value which is less dispersed depending on the measurement portion in the living body, and a stable result can be obtained without being affected by the measurement portion. When the dABI is used, therefore, an influence due to the measurement portion can be suppressed, and the condition of a blood vessel can be stably determined. Also with respect to a subject in whom, because of an injury or the like, it is difficult to measure the diastolic blood pressure in a specific portion such as the upper arm, the diastolic blood pressure can be measured in another portion such as the front arm, and the condition of a blood vessel can be adequately determined. Therefore, the determination can be flexibly performed in accordance with the condition of the subject.
Although, in the embodiment described above, the blood pressure acquiring section 170 communicates with the measuring devices such as cuffs, the invention is not limited to this. The blood pressure acquiring section 170 may include measuring devices such as cuffs.
Although, in the embodiment described above, the example in which the blood pressures of the upper arm and the ankle joint are acquired as those of the upper and lower limbs, respectively has been described, the invention is not limited to this. For example, the blood pressure of the front arm, the wrist, the hand finger, or the like may be acquired as that of the upper limb, and the blood pressure of the thigh, the lower leg, the foot finger, or the like may be acquired as that of the lower limb.
Although, in the embodiment described above, the blood pressure is measured by the pressure raising method in which the cuff pressure is gradually raised from zero, the invention is not limited to this. For example, the blood pressure may be measured by the pressure lowering method in which the cuff pressure is gradually lowered from a state where the cuff pressure is high, or the step pressure reducing method.
Although, in the embodiment described above, the diastolic blood pressure is measured from the cuff pressure at the timing when a pulse wave amplitude having a magnitude which is obtained by subtracting the predetermined rate from the maximum value of the pulse wave amplitude is detected, the invention is not limited to this. For example, the diastolic blood pressure may be measured by checking Korotkoff sounds by using a stethoscope or the like.
Although, in the embodiment described above, the calculated dABI is output by displaying it on the displaying section, the invention is not limited to this. For example, the dABI may be output in the form of sounds. Alternatively, data indicating the dABI may be transmitted to another analysis apparatus or the like. The dABI may be not only output as it is, but also output after converted to an index such as “High,” or “Low,” or to a message, sounds, or the like indicative of a determination result such as “Normal,” “Abnormal,” or “There is a possibility of stenosis or occlusion.”
Next, the index outputting apparatus 100 of a second embodiment will be described.
In the first embodiment described above, the index outputting apparatus 100 outputs the dABI as an index. However, the index output from the index outputting apparatus 100 is not limited to the dABI. For example, the ABI, the mABI, and the ppABI may be output in combination with the dABI. The second embodiment in which the ABI, the mABI, or the ppABI is output in combination with the dABI will be described.
The configuration of the index outputting apparatus 100 of the second embodiment is similar to that of the index outputting apparatus 100 of the first embodiment. Hereinafter, description of portions overlapping with those of the first embodiment is omitted, and description is made with emphasis on portions different from those of the first embodiment.
In the index outputting apparatus 100 of the second embodiment, the blood pressure acquiring section 170 acquires the systolic blood pressure, the mean blood pressure, and the pulse pressure in addition to the diastolic blood pressure.
The processes executed by the index outputting apparatus 100 of the second embodiment are basically identical with those executed by the index outputting apparatus 100 of the first embodiment and illustrated in the flowchart of
Firstly, the index outputting apparatus 100 acquires in the process of step S101 the diastolic blood pressure, systolic blood pressure, mean blood pressure, and pulse pressure of each of the upper and lower limbs of the subject. Methods of acquiring the diastolic blood pressures, the systolic blood pressures, the mean blood pressures, and the pulse pressures are identical with those of the above-described first embodiment.
Then, the index outputting apparatus 100 calculates in the process of step S102 the dABI, ABI, mABI, and ppABI which are ratios of the values of the lower limb to those of the upper limb.
Then, the index outputting apparatus 100 displays in the process of step S103 combinations of the dABI, and the ABI, the mABI, and the ppABI. Specifically, the index outputting apparatus 100 displays screens such as illustrated in
Then, the index outputting apparatus 100 determines in the process of step S104 the condition of a blood vessel while combining the ABI, the mABI, and the ppABI with the dABI.
For example, the plot T which is enclosed by the broken line in the screen of
As illustrated in
In the case where the plot is in region (1), the ABI is equal to or smaller than 0.9. and the dABI is equal to or smaller than 0.8. In this case, in both the determination using the ABI and that using the dABI, it is determined that there is a possibility that stenosis or occlusion occurs in a blood vessel. Therefore, it can be determined that the possibility of stenosis or occlusion of a blood vessel is high.
In the case where the plot is in region (2), although the ABI is in the normal range of 0.9 to 1.4, the dABI is equal to or smaller than 0.8. In this case, because of a reason similar to that in the case of the above-described plot T of
In the case where the plot is in region (3), the ABI is equal to or larger than 1.4, and the dABI is equal to or smaller than 0.8. In this case, similarly with region (2), it can be determined that there is a possibility that stenosis or occlusion occurs in a blood vessel, and there is a further possibility that calcification occurs. Since the ABI is equal to or larger than 1.4 or namely larger than the case of region (2), it can be determined that the possibility that calcification occurs is higher.
In the case where the plot is in region (4), the ABI is equal to or smaller than 0.9, and the dABI is in the range of 0.8 to 1.3. In this case, in the determination using the ABI, it is determined that there is a possibility that stenosis or occlusion occurs in a blood vessel, and, in the determination using the dABI, it is determined that the condition is normal. Therefore, the results of the two determinations are different from each other, and hence it is determined that an abnormality of some kind occurs. A countermeasure such as a rerun of the examination or conduction of an examination of another kind may be taken.
In the case where the plot is in region (5), the ABI is in the normal range of 0.9 to 1.4, and the dABI is in the normal range of 0.8 to 1.3. In this case, in both the determination using the ABI and that using the diastolic blood pressure, it is determined that the condition of a blood vessel is normal. Therefore, it is possible to more surely determine that the condition of a blood vessel is normal.
In the case where the plot is in region (6), the ABI is equal to or larger than 1.4, and the dABI is in the normal range of 0.8 to 1.3. In this case, in the determination using the ABI, it is determined that there is a possibility that an abnormality such as calcification of a blood vessel occurs, and, in the determination using the dABI, it is determined that the condition is normal. Therefore, it can be determined that the possibility of stenosis or occlusion of a blood vessel is low, but there is a possibility that calcification of a blood vessel occurs.
In the case where the plot is in regions (7) to (9) the dABI is equal to or larger than 1.3, and therefore it is determined that an abnormality of some kind occurs in the condition of a blood vessel, the measurement method, the measuring device, etc. In this case, a countermeasure such as a rerun of the examination, checking of the measurement method and the measuring device, or an examination of another kind may be taken.
As described above, according to the index outputting apparatus 100 of the second embodiment, at least one of the ABI, the mABI, and the ppABI is displayed together with the dABI. Therefore, the user can simultaneously check different indexes, and determine the condition of a blood vessel more correctly and quickly.
Moreover, the index outputting apparatus 100 determines the condition of a blood vessel based on a combination of at least one of the ABI, the mABI, and the ppABI, and the dABI. Therefore, it is possible to determine the condition of a blood vessel in a combination of a plurality of determination methods using different indexes, and determination can be performed more correctly.
As illustrated in
In the case where the plot is in region (11), the ABI is equal to or smaller than 0.9, and the dABI is equal to or smaller than 0.8. In this case, in both the determination using the ABI and that using the dABI, it is determined that there is a possibility that stenosis or occlusion occurs in a blood vessel. Therefore, it can be determined that the possibility of stenosis or occlusion of a blood vessel is high.
In the case where the plot is in region (12), the ABI is equal to or larger than 0.9, and the dABI is equal to or smaller than 0.8. In this case, it is determined that there is a possibility that stenosis or occlusion occurs in a blood vessel, and a detailed examination is necessary.
In the case where the plot is in region (13), the ABI is equal to or smaller than 0.9, and the dABI is equal to or larger than 0.8. In this case, in the determination using the ABI, it is determined that there is a possibility that stenosis or occlusion occurs in a blood vessel, and a detailed examination is necessary.
In the case where the plot is in region (14), the ABI is equal to or larger than 0.9, and the dABI is equal to or larger than 0.8.
Although, in the embodiment described above, the determination is performed while the plot region is divided into the nine or four regions, the invention is not limited to this. The number and positions of the divided regions may be adequately changed in accordance with the number and values of thresholds which are set in order to determination for each index.
Although, in the embodiment described above, results of calculations of the two indexes are plotted on a two-dimensional matrix, the invention is not limited to this. For example, results of calculations of three indexes may be plotted on a three-dimensional matrix, or four indexes may be displayed in the form of a bar graph or a rectangular graph.
The means and methods for performing the various processes in the index outputting apparatuses of the above-described embodiments may be realized by either of a dedicated hardware circuit and a programmed computer. For example, the programs may be provided by a computer readable recording medium such as a flexible disk or a CD-ROM, or provided online through a network such as the Internet. In this case, the programs which are recorded on a computer readable recording medium are usually transferred and stored in a storage section such as a hard disk drive. Alternatively, the programs may be provided in the form of standalone application software, or incorporated as one function of the index outputting apparatus into software of the apparatus.
The present application is based on Japanese Patent Application No. 2015-099352, filed on May 14, 2015, the entire contents of which are incorporated herein by reference.
There is provided with a method, apparatus, and program for outputting an index for adequately determining the condition of a blood vessel even in the case where calcification of the blood vessel occurs.
100 index outputting apparatus
110 CPU
120 ROM
130 RAM
140 storage device
150 displaying section
160 operating section
170 blood pressure acquiring section
180 bus
Number | Date | Country | Kind |
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2015-099352 | May 2015 | JP | national |
Filing Document | Filing Date | Country | Kind |
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PCT/JP2016/002311 | 5/11/2016 | WO | 00 |