JPH04150832A - Electrocardiogram display device - Google Patents

Abstract

PURPOSE:To enable the displaying of an electrocardiogram waveform in expansion at a desired position on a screen by arranging an expansion display means to display a waveform being expanded within an expansion display window at a cursor position of the compression electrocardiogram waveform shown within the expansion display window. CONSTITUTION:An expansion display window is formed at a position different from a cursor position on a screen with an expansion display processing function block 4, an expansion display window ON function block 7, an expansion display window OFF function block 8, a function block 9 for displaying the movement of waveforms within the window and the like among function blocks and an expansion display means is constructed to perform an expanded display of a waveform in the window at a cursor position of the compression electrocardiogram waveform displayed within the expansion display window. The expansion display window displayed being expanded on a display screen is made at such a position as not to conceal the original compression waveform. Thus, the electrocardiogram waveform displayed in compression is displayed being expanded at a different position on the screen thereby enabling the catching of the electrocardiogram waveform having a transient change caused.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to an electrocardiogram display device, and more particularly to an electrocardiogram display device suitable for use in enlarging and displaying a portion of stored long-term electrocardiogram waveform data. .

B1 Summary of the Invention The present invention provides an electrocardiogram display device that compresses electrocardiogram waveform data and displays the compressed electrocardiogram waveform data over a plurality of lines on a display screen, comprising: cursor display means for displaying a cursor on the display screen;
An enlarged display window is formed at a position on the screen different from the cursor position, and the waveform at the cursor position of the compressed electrocardiogram waveform displayed in the enlarged display window is enlarged and displayed in the enlarged display window. By providing a display means, it is possible to enlarge the compressed and displayed electrocardiogram waveform at a desired position and see details of the waveform while observing successive electrocardiogram waveforms at a desired position that are compressed and displayed. It is something to do.

C0 Prior Art Various types of electrocardiograms are known depending on the purpose.

Generally, in many cases where electrocardiograms are used in hospitals, etc., the measured electrocardiogram waveforms are recorded directly on recording paper and used, for example when the patient is already unwell or when the patient is being monitored for surgery. ing.

In addition, when recording electrocardiogram waveforms over a rather long period of time, such as several tens of minutes or longer, if the electrocardiogram waveforms are directly recorded on recording paper as described above, a large amount of recording paper will be required. There is a lot of waste in recording electrocardiogram waveforms due to redundancy and the like. As an apparatus for efficiently recording electrocardiogram waveforms on recording paper in such cases, for example, Japanese Patent Application Laid-Open No. 1-148236 stores the input electrocardiogram signal in a digital quantity and monitors it on a display. An electrocardiogram recording apparatus has been proposed that inputs a signal to start recording when an electrocardiogram waveform to be recorded appears, and records only a designated recording time range based on this recording start time.

This electrocardiogram recording device amplifies the electrocardiogram signal in an amplification section, converts the electrocardiogram signal from an analog quantity to a digital quantity in an A/D conversion section, and sequentially stores the electrocardiogram signals from a storage section in chronological order. The electrocardiogram waveform read out is configured to control the operation of the storage section using a control signal output from a main control section that controls the entire device, thereby recording and displaying the electrocardiogram waveform read out.

This electrocardiogram recording device effectively uses the storage capacity of the storage unit to record electrocardiogram waveforms over a certain recording time range from when the recording start signal is input, thereby saving the recording paper described above. We are trying to

However, in the electrocardiogram recording apparatus disclosed in Japanese Patent Application Laid-Open No. 1-148236, the electrocardiogram waveform displayed on the display section is visually checked as it is, and therefore cannot be processed at high speed.

Further, as another example of the electrocardiogram recording device described above, there is a device that monitors for a longer period of time (for example, 24 hours) in order to diagnose transient electrocardiogram abnormalities that occur in daily life.

This device uses a long-term electrocardiogram method called Holter electrocardiography, which records electrocardiograms of daily life situations for a long time, for example, 24 hours, using a portable magnetic tape recorder, and then plays them back at high speed on an analysis system to detect electrocardiogram abnormalities. This is due to

This electrocardiogram display device analyzes a large number of electrocardiograms over 24 hours, so one screen of the display can contain 10 to 30 electrocardiograms.
The diametric diagram waveform of about 1 minute is compressed and displayed. When analyzing records monitored over a long period of time by visual inspection, this electrocardiogram display device can read and analyze changes in the electrocardiogram in a short period of time.

D0 Problems to be Solved by the Invention However, since this electrocardiogram display device using the long-term electrocardiogram method capable of compressed display displays a large amount of data on one screen, the electrocardiogram waveform becomes small. If the electrocardiogram waveform becomes small in this way, it becomes difficult to observe, for example, movements at the ST level, which are effective for detecting arrhythmia or diagnosing myocardial ischemia.

In view of the above-mentioned problems, the present invention aims to provide an electrocardiogram display device that can enlarge and display an electrocardiogram waveform at a desired position on the screen of the electrocardiogram display device.

80 Means for Solving the Problems The electrocardiogram display device according to the present invention includes a cursor display means for displaying a cursor on a display screen, and an enlarged display window formed at a position on the screen different from the cursor position, The above problem is solved by providing an enlarged display means for enlarging and displaying the waveform at the cursor position of the compressed electrocardiogram waveform displayed in the display window in the enlarged display window.

F0 action The electrocardiogram display device according to the present invention enlarges and displays a compressed electrocardiogram waveform by forming an enlarged display window at a position on the screen different from the cursor position on the display screen.

G. Examples Hereinafter, specific examples of the present invention will be described with reference to the drawings.

The electrocardiogram display device according to the present invention is a device that performs screen display and analysis while reproducing recorded data recorded over a long period of time on a portable magnetic tape recorder or the like via an electrocardiogram measuring device at high speed.

The functional blocks of the graphic controller that displays the electrocardiogram waveform on the screen have a block structure as shown in FIG. A case in which an electrocardiogram waveform is displayed in an enlarged manner will be described with reference to FIG.

The input selection function block 1 performs input using an input device such as a so-called mouse. The input selection data from the input selection function block 1 is sent to a screen display device such as a bitmap display to a function block 2 for moving the compressed electrocardiogram page, a function block 3 for moving the line, and an enlarged display processing function block 4. .

These functional blocks perform control operations based on input selection data output from the input selection functional block l.

Functional blocks for directly controlling the display on the screen display device include, for example, a pressure line waveform display function block 5, a cursor display function block 6 for displaying a cursor to visually confirm a desired point, and an enlarged display window. An enlarged display window on function block 7 for forming an enlarged display window, an enlarged display window off function block 8 for deleting the enlarged display window, and an electrocardiogram waveform data displayed within the window is moved as the cursor position is moved. An intra-window waveform movement display function block 9 is provided, a mouse position detection function block 10 is provided for detecting the position of the mouse, and further,
An electrocardiogram file data read function block 11 is provided to read electrocardiogram file data.

Here, the means for compressing the electrocardiogram waveform data and displaying it over multiple lines on the display screen are a functional block 2 that moves the compressed electrocardiogram page, a functional block 3 that moves the compressed electrocardiogram line, and a functional block 5 that displays the compressed waveform.
It is composed of etc. Further, means for displaying a cursor on the screen is constituted by a cursor display function block 6 and the like. Furthermore, among the functional blocks shown in FIG. 1, the enlarged display processing function block 4, the enlarged display window on function block 7, the enlarged display window off function block 8, the intra-window waveform movement display function block 9, etc. The cursor position is an enlargement that forms an enlarged display window at a position on the screen, and enlarges and displays the waveform at the cursor position of the compressed electrocardiogram waveform displayed above within this enlarged display window. A display means is configured. By using the above four functions, the enlarged display window enlarged and displayed on the display screen can be opened at a position that does not hide the original compressed waveform.

FIG. 2 shows an example of a program that controls the graphic controller when performing enlarged display in this manner.

The program shown in FIG. 2 is expressed as one subroutine in the program of the electrocardiogram display device.

First, in step S21 of FIG. 2, electrocardiogram waveform data is read from an electrocardiogram file, and in step S22, the read electrocardiogram waveform data is accurately displayed. The specific operations in steps S21 and S22 will be explained based on the correspondence with each functional block in FIG. 1.The electrocardiogram file data read function block 11 selects an electrocardiogram file and reads the data into the memory. Then, the display range of the read file data is specified in function block 2 for moving the compressed electrocardiogram by page and function block 3 for moving the compressed electrocardiogram by line.

As a result, electrocardiogram file data selected from electrocardiogram file data stored in, for example, a hard disk or the like is effectively read into the display memory area within the electrocardiogram display device. Next, the compressed waveform display function block 5 compresses and displays the compressed waveform on the entire screen.

In this way, the electrocardiogram waveform data is compressed and displayed over multiple lines on the display screen.

In step 323, it is determined whether to use enlarged display.

If the enlarged display is not to be performed, the process moves to step S33 and returns to exit the subroutine.

This enlarged display may be performed by canceling the compressed display and displaying the electrocardiogram waveform enlarged to a size that allows diagnosis, for example, when delicate diagnosis is required for the original electrocardiogram waveform data.

When it is determined in step S23 that the compressed electrocardiogram waveform should be displayed in an enlarged manner, in the next step S24, the cursor display function block 6 and the mouse position detection function block 1O shown in FIG. Perform setting operations such as moving the cursor and detecting where the cursor is on the screen. Here, for example, in this setting operation, the cursor is moved to a desired position and then the mouse button is pressed to capture the cursor position on the screen.

In step S25, it is determined whether the captured cursor position data is in the upper half of the screen.

If it is determined that there is no cursor in the upper half of the screen, a display operation is performed to open an enlarged display window in the upper half in step S27. If it is determined that the cursor is located in the upper half of the screen, a display operation is performed to open an enlarged display window in the lower half of the screen in step S26. Both steps 326 and 5270 are then executed in step 328 by the enlarged display window on function block 7 shown in FIG. Display the electrocardiogram waveform data above in an appropriate size.

Furthermore, in step $29, it is determined whether the cursor position should be moved while maintaining the enlarged display function in the enlarged display window.

If it is determined in this step 329 that there is a cursor movement on the compressed display screen in the horizontal direction, for example, the cursor position is detected by the mouse position detection function block 10 as described above, and the process proceeds to the next step S30. In this step S30, the readout address of the display memory is shifted according to the cursor position detected as the cursor moves in step S29, and the process returns to step S28, and the electrocardiogram on the memory at the new readout address of the display memory is shifted. Display waveform data in an enlarged display window.

At this time, the functional block necessary for displaying within the enlarged display window is the intra-window waveform movement display functional block 9.

On the other hand, if no movement is to be performed, the process moves from step S29 to step S31. In step S31, it is determined whether to turn off enlarged display.

The determination as to whether or not to turn off this enlarged display is made based on, for example, whether or not the mouse button is pressed in step S31. If the mouse button is pressed, operation returns to step S2B. If the mouse button is not pressed, the process moves to step S32 and the enlarged display window is closed. Further, after the operation in step S32, the program proceeds to step S33, returns and exits from this subroutine for performing enlarged display.

When performing enlarged display from compressed display in this manner, a screen 34 displaying a compressed electrocardiogram is displayed on the display screen, as shown in FIG. 3, for example. The compressed electrocardiogram display for one line in the horizontal direction on the compressed display screen 34 can display a time corresponding to one to three minutes of the recorded electrocardiogram waveform. Furthermore, the vertical direction of the screen is approximately l.
Approximately O pieces are displayed. In the compressed electrocardiogram display, one line of display fabric is continuously displayed at the left end of the next displayed line. By continuously displaying the time in this manner, the maximum time that can be displayed on one screen is about 30 minutes.

On the screen 34 displaying this compressed electrocardiogram, when the desired position 35 of the displayed cursor is in the upper half of the screen, an enlarged display window 36 is opened in the lower half of the screen, and the displayed cursor is When the desired position 37 of the crane is in the lower half area of the screen, the enlarged display window 38
can be opened in the top half of the screen.

As mentioned above, when it comes to electrocardiogram waveform abnormalities, it is not necessary to focus only on a single waveform, but it is necessary to judge them by referring to the electrocardiogram waveforms that precede and follow in time. By using the in-window waveform movement display function block 9 that moves the electrocardiogram waveform forward and backward in time, for example, by performing a so-called drag operation in which the cursor is moved while holding down a mouse button, it is possible to move the electrocardiogram waveform forward or backward in time. The electrocardiogram waveform can also be continuously enlarged and examined.

Note that the method for selecting enlarged display using the mouse is not limited to the method of holding down the mouse button; for example, the so-called click operation of pressing the mouse button is used as a trigger signal to select the cursor (or icon) displayed on the screen. ) When you want to stop moving the cursor at the same time as importing the position coordinates (fixing the cursor movement), and then want to move the cursor again, you need to keep the mouse button pressed all the time by clicking the mouse button again. It is also possible to consider ways to improve operability when displaying an enlarged image, such as by eliminating it.

When ending the enlarged display and returning to the original compressed electrocardiogram,
The function block 8 shown in the figure closes (off) the enlarged display window and the function block 5 displays the compressed electrocardiogram waveform.
is used.

Other functional blocks include the electrocardiogram file data read function block 11 shown in FIG. 1 for displaying a list of stored electrocardiogram files and reading a selected file.

FIG. 4 shows an example of the hardware configuration of essential parts of an electrocardiogram display device having the above-described functional blocks.

A so-called CPU of the central processing unit 40 integrally controls the enlarged display section of the electrocardiogram display device.

Further, this interrupt signal is sent to the CPU 40 from an interrupt controller 49 that controls interrupts in response to functions such as cursor display means for displaying a cursor on the display screen. C.P.
U40 operates each circuit within the device based on the interrupt signal.

The magnetic recording device for recording and reading long-term electrocardiogram waveforms from the portable magnetic tape recorder, etc. includes a floppy disk drive device 45 and a SCSI (SCSI).
mall Computer 5yste+++ In
There are a hard disk 46 and a digital tape drive device 47 that send and receive data via a controller 48 (interface).

Next, the magnetic recording device sends the retrieved electrocardiogram waveform data to the RAM 43. In addition, DMA (Direct
The Me+5ory Access) controller 44 controls the data in the RAM 43. This RAM4
3, the memory can be used as graphics RAM.

The graphic controller 41 is a window forming means that forms an enlarged display line window at a position on the screen different from the position where the cursor is displayed, and an enlarged display processing means that enlarges and displays the image within the enlarged display window. The electrocardiogram waveform is displayed on the bit map display 42.

By enlarging and displaying the compressed electrocardiogram waveform at a position on the same screen that is different from the cursor position, it is possible to capture the electrocardiogram waveform with transient changes while also displaying the electrocardiogram waveform. For example, details such as level fluctuations, which are effective in diagnosing myocardial ischemia, can be seen. That is, by displaying a compressed electrocardiogram over a long period of time (for example, 24 hours or more), it is possible to capture transient changes that are difficult to detect in a short period of time.

In general, electrocardiogram waveform abnormalities are not only focused on the abnormal waveform, but also include electrocardiogram waveforms that are successive in situation and time series. Therefore,
The enlarged display of this electrocardiogram display device allows you to easily observe the electrocardiogram waveforms before and after the time series in which the abnormal waveform occurred, allowing you to see even the details of the waveforms and accurately improving the reliability of diagnosis. become.

Note that the present invention is not limited to the above-mentioned embodiments (as it is sufficient to consist of functional blocks required for enlarged display, when enlarging display, only the minimum necessary functional blocks are required). Functional blocks may be limited and simplified, or functional blocks other than the enlarged display function may be added to enhance functionality.

H9 Effects of the Invention As is clear from the above explanation, the electrocardiogram display device of the present invention enlarges and displays the compressed electrocardiogram waveform at a position on the screen different from the cursor position of the display device. It is possible to capture electrocardiogram waveforms in which transient changes occur.

In addition, when the electrocardiogram waveform is normal, you can easily see the details of the enlarged waveform while observing it, including the ECG waveforms before and after the abnormal waveform, allowing for quick and accurate diagnosis and analysis. The reliability of the system can also be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the functions of an embodiment of an electrocardiogram display device according to the present invention. 2 is a flowchart showing the program operation, FIG. 3 is a schematic diagram showing the display screen when it is enlarged, and FIG. 4 is a diagram showing the hardware configuration of the main part. 1 O... Input select function block... Enlarged display processing function block... Compressed waveform display function block... Cursor display function block... Enlarged display window on function block... Enlarged display window/off function block/electrocardiogram waveform movement within window function block...Mouse position detection function block 1st Fig. 20 Gram 70-Chart Fig. 2

Claims (1)

[Scope of Claims] In an electrocardiogram display device that compresses electrocardiogram waveform data and displays it over a plurality of lines on a display screen, a cursor display means for displaying a cursor on the display screen; an enlarged display means for forming an enlarged display window at the enlarged display window, and enlarges and displays the waveform at the cursor position of the compressed electrocardiogram waveform displayed in the enlarged display window. Electrocardiogram display device.