JP3129551B2 - Power average display method during averaging - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of displaying a power spectrum at the time of averaging, and more particularly to a method of displaying a power spectrum at the time of averaging in RR interval spectrum analysis in an auto mode.

[0002]

2. Description of the Related Art Conventionally, a method of spectrally analyzing an RR interval, which is an interval between R waves constituting an electrocardiogram, based on the relationship between cardiac dysfunction and autonomic nervous disorder, that is, a power spectrum of RR interval variation It is well known that a method of analyzing the frequency of a signal using fast Fourier transform contributes to the discovery of autonomic nervous disorder. In the RR interval spectrum analysis, a manual mode for spot analysis of an arbitrary portion in the RR interval data of 24 hours,
There is an auto mode in which an arbitrary section of the 24-hour RR interval data is continuously analyzed at a constant interval. While the analysis result in the manual mode is displayed in two dimensions, the analysis result in the auto mode is displayed in three dimensions as shown in FIG. In FIG.
.., D2... Are display time intervals that are one section of 24 hours from 19:00, which is the display start time, for example, a representative power spectrum in each one hour. Conventionally, the following averaging method has been employed as a method for obtaining the representative power spectrum. That is, first, the display time interval (for example, 60 minutes) is set as one section, and RR interval spectrum analysis is performed for each analysis area at each predetermined interval (for example, 10 minutes) obtained by dividing one section. Are added, and the result obtained by dividing the total power spectrum as the addition result by the total number of additions (for example, 6) is used as the representative power spectrum D1, D2,.
It is a method.

[0003]

The conventional averaging method described above analyzes only the RR interval data at the head of the display time interval and makes it a representative power spectrum. Since the following RR interval data is also targeted and has the effect of suppressing noise components on each power spectrum, more accurate analysis results can be obtained. However, with only the representative power spectrum obtained by this averaging method (FIG. 3), it is unclear what data each representative power spectrum D1, D2... That is, the contents of the representative power spectrum are not known. An object of the present invention is to clarify the contents of a representative power spectrum calculated by an averaging method in RR interval spectrum analysis in an auto mode.

[0004]

The above-mentioned object is achieved by setting a display time interval T to be one section, and representative power obtained by averaging each power spectrum as an RR interval spectrum analysis result for each predetermined interval t obtained by dividing the one section. A first display screen 1 on which a spectrum is displayed, a second display screen 2 on which each power spectrum used for calculating the representative power spectrum for each section division interval t is displayed, The problem is solved by a method of displaying a power spectrum at the time of averaging, wherein a third display screen 3 on which upper and lower limits are displayed is displayed.

[0005]

As described above, according to the present invention, as shown in FIG. 1, a first display screen 1 on which a representative power spectrum as an averaging result is displayed and which is used to calculate this representative power spectrum. A second display screen 2 on which each power spectrum is displayed and a third display screen 3 on which the upper and lower limits of each power spectrum are displayed are displayed. That is, for each section, a representative power spectrum (first display screen 1), each power spectrum (second display screen 2),
The upper and lower limits (third display screen 3) of each power spectrum are displayed. By collating these, it is possible to find out what data the representative power spectrum (first display screen 1) for each section is composed of (second display screen 2, third display screen 3), The contents of become clear.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments with reference to the accompanying drawings. The present invention, as described in claim 1,
The display time interval T is defined as one section, and the first display screen 1 displaying a representative power spectrum obtained by averaging and averaging the respective power spectra which are the results of the RR interval spectrum analysis for each of the predetermined intervals t obtained by dividing the one section; A second display screen 2 displaying each power spectrum for each section division interval t used for calculating the representative power spectrum, and a third display screen 3 displaying the upper and lower limits of each power spectrum are displayed. This is a power spectrum display method during averaging, characterized by being displayed.

FIG. 1 is a diagram showing an embodiment of the present invention.
In this case, for example, when the “average averaging power spectrum display” key (not shown) is pressed on the 24-hour power spectrum trend screen shown in FIG. 3, the screen is switched to the screen shown in FIG. In FIG. 1, reference numeral 1 denotes a first display screen, 2 denotes a second display screen, and 3 denotes a third display screen. The first display screen 1 has a display time interval T of one section,
13 is a screen displaying a representative power spectrum obtained by averaging and averaging each power spectrum as an RR interval spectrum analysis result for each predetermined interval t obtained by dividing the section. In the first display screen 1, reference numeral 1A is an LF component, and 1B is an H component.
The F component. The LF component 1A has a frequency of 0.03
In the range of 9 c / b to 0.148 c / b, for example, it is displayed in green, and the HF component 1B has a frequency of 0.148 c / b.
In the range of c / b to 0.398 c / b, for example, it is displayed in light blue. The other frequency ranges of 1C and 1D are displayed in yellow.

The representative power spectrum displayed on the first display screen 1 is based on the averaging method shown in FIG. As described above, the averaging method first sets the display time interval T to one section, and sets the RR for each of the analysis areas K11, K12,.
An interval spectrum analysis is performed, then the respective power spectra as the analysis results are added, and the result obtained by dividing the total power spectrum as the addition result by the total number of additions is used as a representative power spectrum D1, D2,. It is a method.

The averaging method will be described below with reference to FIG. First, the display time interval T is defined as one section, and each analysis area K11, K12,.
Is subjected to RR interval spectrum analysis. In the present embodiment, the display time interval T is 60 minutes, a predetermined interval obtained by dividing one section with the 60 minutes as one section, that is, one section division interval t is 10 minutes, and the moving amount is 1 is there. Therefore, as shown in FIG. 1, the analysis start time in each analysis area K11, K12.
The RR interval spectrum analysis is performed shifted by 0 minutes.
That is, for the analysis area K11, the display start time 19:
The analysis is started from 00, and for the analysis area K12,
The RR interval spectrum analysis is performed up to the analysis area K16 such that the analysis starts at 19:10.

Next, the power spectra as the analysis results are added. That is, each of the analysis areas K11, K12
・ ・ In R, shift the analysis start time by 10 minutes.
The R-interval spectrum analysis is performed, and each power spectrum as the analysis result is added. In this case, the total power spectrum added is S1. Further, the result obtained by dividing the total power spectrum by the total number of additions is used to represent representative power spectrum representative values D1, D2,.
・ ・As described above, the total power spectrum that is the addition result of one section from 19:00 to 20:00 is S
Since the total number of additions is 1, the representative power spectrum D1 in this section is S1 / 6. Such averaging is performed at 21:00 from 20:00 to 21:00.
From 18:00 to 19:00
This is performed every 60 minutes of the display time interval. The resulting representative power spectrum is as follows. D1 = S1 / 6... Representative power spectrum from 19:00 to 20:00 D2 = S2 / 6... Representative power spectrum from 20:00 to 21:00 D24 = S24 / 6 ... 18:00 to 19:00 Representative power spectrum Of such 24 representative power spectra, FIG.
The first display screen 1 shown in FIG.
9 (from 9:00 to 20:00). Similarly, D2, D3.
... Each of D24 is displayed as in the first display screen 1.

[0011] The second display screen 2 displays one section division interval t used for calculating the representative power spectrum.
4 is a screen on which each power spectrum is displayed. For example, in the first section 1H (from 19:00 to 20:00), each of the analysis areas K11, K12, K13, K14, K15, and K1 for every 10 minutes obtained by dividing this 1H into six.
The second display screen 2 shown in FIG. 1 displays the power spectrum, which is the result of the six analysis results for No. 6. That is,
Each of the power spectra before the averaging is displayed.

The third display screen 3 is a screen on which the upper and lower limits of each power spectrum are displayed. In the second display screen 2 described above, for example, the first section 1H (1
9:00 to 20:00) each analysis area K11, K
Six power spectra, which are the analysis results for 12, K13, K14, K15, and K16, are displayed. By superimposing these six power spectra, the maximum value MA
The third display screen 3 clarifies the width of the data existing between X and the minimum value MIN and displays the upper and lower limits.
As described above, the first display screen 1 on which the representative power spectrum as the averaging result is displayed, the second display screen 2 on which each power spectrum used to calculate the representative power spectrum is displayed, and A third display screen 3 displaying the upper and lower limits of the power spectrum is displayed. Then, a set of three first display screens 1 and 2
The display screen 2 and the third display screen 3 are displayed in all sections, for example,
Display over four sections.

[0013]

As described above, according to the present invention, the display time interval T is defined as one section, and each power spectrum, which is the result of RR interval spectrum analysis for each predetermined interval t obtained by dividing the one section, is averaged. A first display screen 1 on which a representative power spectrum is displayed; a second display screen 2 on which each power spectrum used for calculating the representative power spectrum for each section division interval t is displayed; Third display screen 3 showing upper and lower limits of spectrum
Is displayed, a technical measure of a power spectrum display method at the time of averaging is taken. According to this configuration, the first display screen 1 on which the representative power spectrum as the averaging result is displayed, the second display screen 2 on which each power spectrum used to calculate the representative power spectrum is displayed, The third display screen 3 on which the upper and lower limits of each power spectrum are displayed is displayed. That is, the representative power spectrum (first
A display screen 1), each power spectrum (second display screen 2), and upper and lower limits of each power spectrum (third display screen 3) are displayed. By collating these, it is possible to find out what data the representative power spectrum (first display screen 1) for each section is composed of (second display screen 2, third display screen 3), The contents of become clear. That is, in the RR interval spectrum analysis in the auto mode, the technical effect of clarifying the content of the representative power spectrum calculated by the averaging method is achieved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention.

FIG. 3 is a general explanatory diagram of a spectrum analysis result in an auto mode.

[Explanation of symbols]

 1 First display screen 2 Second display screen 3 Third display screen T Display time interval t 1 section division interval MAX Maximum value MIN Minimum value

Claims (4)

(57) [Claims] 1. A first display in which a display time interval T is defined as one section, and a representative power spectrum obtained by averaging and averaging respective power spectrums obtained as RR interval spectrum analysis results at predetermined intervals t obtained by dividing the one section is displayed. Screen 1, a second display screen 2 displaying each power spectrum for each section division interval t used for calculating the representative power spectrum, and a second display screen 2 displaying the upper and lower limits of each power spectrum. 3. A method for displaying a power spectrum at the time of averaging, wherein a display screen 3 is displayed. 2. The display time interval T is 60 minutes.
The power spectrum display method at the time of averaging described. 3. The method for displaying a power spectrum at the time of averaging according to claim 1, wherein one section division interval t is 10 minutes. 4. The method according to claim 1, wherein the number of each power spectrum is six.