JPS59222129A - Long-time electrocardiograph recording system - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a long-term recording method for electrocardiogram waveforms.

Conventionally, when recording electrocardiogram waveforms for a long time.

It used to be common to use magnetic tape recording devices, but in recent years there has been remarkable progress in the technological development of computers and various semiconductor devices, and ICs using microconverters are now being used.
Recording in memory, etc. is being considered. However, I.C.
The recording method in memory etc. uses discrete digital data obtained by sampling the electrocardiogram waveform at several hundred Hz, so the storage capacity is much smaller than the method in which magnetic tape is stored while controlling its drive, and it cannot be stored for a long time. It was impossible to record an electrocardiogram over the entire period.

Therefore, the microcomputer-based long-term electrocardiogram recorders currently available only record the number of occurrences of arrhythmia such as premature contractions.

However, since it is easy to misidentify arrhythmias such as premature contractions due to artifacts induced along with electrocardiogram waveforms, there is a problem in that recording only the number of occurrences is unreliable.

The present invention was proposed in view of the above problem, and although the electrocardiogram waveform changes slightly depending on changes in heart rate and body position,
Based on the recognition that the waveform induced from the same electrode position is almost constant and changes only when an arrhythmia or artifact occurs, all different waveform patterns that appear are assigned codes and registered in a pattern table. This relates to a long-time electrocardiogram recording method that allows the recording of only the codes of electrocardiograms with the same waveform, thereby significantly reducing the required memory capacity without losing the waveform information in which the electrocardiogram appears over a long period of time. .

Hereinafter, the present invention will be explained in detail based on examples.

FIG. 1 is a block diagram of an embodiment of the present invention, and 1 is an EC
G amplifier, 2 is an A/D converter, and 3 is a CPU (central processing unit).

4 is ROM (read only memory), 5 is RAM (random access memory), 6 is RAM for pattern table
, 7 is a recording memory, and 8 is a clock circuit.

One embodiment of the present invention operates as shown in the flowchart of FIG. 2, and executes instructions programmed in the ROM 4 by being read into the CPU 3.

That is, the processing program by the CPU 3 includes a step (1) in which the electrocardiogram signal amplified by the ECG amplifier 1 is digitized by the A/D converter 2, a step (2) in which this digital signal is stored in the RAM 5, Step of determining whether this stored waveform is the first pattern (
3), when it is the first pattern, registering it in the pattern table RAM 6 (4), and when it is not the first pattern, calling the waveform pattern registered in the pattern table RAM 6 (5) and R.O.
Step (6) of comparing within the threshold set appropriately for M4
and a step (7) in which it is determined whether the comparison results in step (6) match, and when it is determined in step (7) that the comparison results do not match, this is stored in the pattern table RAM 6.
step (8), step (when it is judged that the comparison result matches by force, or step 1 (41) and step (8)
) When a new waveform pattern is registered, there is a step (9) of recording each code associated with each waveform pattern in the recording memory 7 over time.

As a result, for example, the pattern table RAM 6 has different waveform patterns a, b,
c,... and the code associated with it (one person C
2), (3), . . . are registered as turntable data, and the recording memory 7 contains waveform patterns FLHb, Co, .
The above code (1) indicates Q C2 people (3),...
...is the time 10:32. ]2:45°12:46.・・・
It is recorded over time like...

In another embodiment of the present invention, the program operates as shown in the flowchart of FIG. 3, and the steps (
1') to (3) correspond to steps (1) to (3) in Figure 2, respectively.When this stored waveform is the first pattern, this pattern is stored in the recording memory over time. 7, and a step (4') of registering the address of the waveform pattern completely recorded in step (4') in the turntable RAM 6 together with the corresponding code.
), when the stored waveform is not the first turn, the step of calling up the pattern registered in the pattern table RAM 6 (5), and the step of comparing within the threshold set appropriately in the ROM 4 (6 ') and step (step (7) to determine whether or not the comparison results in 6 match, and when it is determined that the comparison results do not match in step (7'), the results are stored in the recording memory 7 over time. Recording step (
step (8') and step (8') of registering the waveform pattern recorded in the pattern table RAM 6 together with the code corresponding to the pattern at the address of the waveform pattern;
'), when the comparison results match, R for pattern table
There is a step (9') of recording the code registered in the AM 6 into the recording memory 7 over time.

As a result, for example, RAI! for pattern table! i6 has the waveform pattern code f11.K as shown in FIG. 5(A). +21.・・・・・・ Address (12AB), (20EF) where the waveform pattern is recorded
, ... are registered as pattern table data,
In addition, as shown in FIG. 5(B), the recording memory 7 has the following information:
The time and the code or waveform pattern registered in the pattern table are recorded.

In this way, the electrocardiogram waveform recorded.

With simple processing, the output can be easily displayed on an output device such as a CRT display or printer, as shown in FIG. 6, for example.

As is clear from the above description, according to the present invention, the required memory capacity can be extremely reduced in recording electrocardiogram signals over a long period of time, and all the electrocardiogram waveforms that appear can be stored at appropriately set threshold values. It is possible to record accurately within this range.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the long-term recording method of the present invention, FIGS. 2 and 3 are flowcharts of different embodiments using the configuration of FIG. 1, and FIG.
5(B) and FIGS. 5(A) and 5(B) are schematic diagrams for explaining the recording situation, and FIG. 6 is an explanatory diagram for output display. 1: ECG amplifier, 2: A/D converter, 3: CPU
, 4: ROM, 5: RAM, ci: RAM for pattern turntable, 7: Memory for recording.

Claims (1)

[Claims] In a method for recording electrocardiogram waveforms over a long period of time. An electrocardiogram signal input means, and a memory means for recording a waveform pattern of the electrocardiogram signal from the input means and/or a code associated therewith over time. The control means includes a pattern table storage means for registering both the code and the waveform pattern recorded in the memory means and the address at which the waveform pattern is recorded, and a control means for driving and controlling each of the means. The method records the waveform pattern and/or the code associated therewith in the memory means over time, simultaneously registers the code and the waveform pattern, or the address where the waveform pattern is recorded, in the pattern table storage means, and thereafter, the new The waveform pattern that appears is compared with the previously registered waveform pattern within an appropriately set threshold to determine whether they match, and when they match, the matched waveform pattern is stored in the memory means. If they do not match, a new waveform pattern and/or a code associated with it is recorded in the memory means, and at the same time a new waveform pattern or this waveform pattern is recorded in the pattern table storage means. A long-term electrocardiogram recording method characterized by registering a recorded address together with an associated code;