JPS59186544A - Abnormal cardiograph discriminating apparatus - Google Patents

Abstract

(57) [Summary] 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 an abnormal electrocardiogram recognition device that recognizes abnormalities in electrocardiogram waveforms.

Conventionally, in this type of device that recognizes abnormal electrocardiogram waveforms, normal electrocardiogram waveforms are often mistakenly recognized as abnormal electrocardiogram waveforms due to baseline drift due to body movements and artifacts such as electromyogram components. In particular, since the evaluation of the ST level is an evaluation of the segment level value on the ST with respect to the baseline, it is most susceptible to interference by drift and/or artifacts.

SUMMARY OF THE INVENTION An object of the present invention is to provide an abnormal electrocardiogram recognition device that can correctly evaluate the ST level of a nosi electrogram despite the interference caused by the above-mentioned drift and/or artifacts. Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram clearly showing the configuration of the present invention, and FIGS. 2 fa) to (c) are schematic diagrams for explaining the operation of each part in FIG. 1.

For the electrocardiogram signal ECG containing artifacts as shown in FIG. 2 (at) received by the input means 1, the PQ upper segment recognition means 2 recognizes the <P-Q segment as shown by the arrow in FIG. 2(a). Then, the baseline conversion means 3 approximates the P-Q segment of each 71 J beats with a straight line as shown in FIG. With respect to the electrocardiogram waveform shown in FIG. The ST level is evaluated by the ST level evaluation means 5 for the waveform shown in FIG.

FIG. 3 is a block diagram of an embodiment of the present invention, 1],
12.13 is an amplifier, 14 is an analog multiplexer,
] 5 is an A/D converter, 16 is a CPU (central processing unit), 17 is a ROM (read only memory), 18 is a RAM (random access memory), 1
9 is a display means, and 20 is a clock oscillator. Further, FIG. 4 is a flowchart illustrating the operation of the apparatus of the present invention shown in the block diagram of FIG. 3.

The abnormal electrocardiogram recognition device of the present invention shown in FIG.
The instructions programmed in I7 are read into CPU I6 and executed.

First, the CPU 6 issues an input data selection control command to the analog multiplexer 14, and also issues an A/D modification command to the A/D converter 5.

The electrocardiogram signals of each lead ECGI to ECG3 are amplified by amplifiers 11 to 13, respectively, and then sent to an A/D converter 15 one after another while being sequentially switched by an analog multiplexer 14.

The A/D converter 15 converts the received electrocardiogram signals for each lead into digital signals and sends them to the CPU 16.

On the other hand, the R liquid detection means 6 determines whether the IL? The R wave is detected from the electrogram signal and this detection signal is applied to the MPU 16.

The CPU 6 stores the electrocardiogram signals of each lead input as digital signals by the A/D converter 5 in respective data buffer memories, and then performs recognition processing.

This recognition process includes a process of recognizing the position of the P-Q segment from the stored electrocardiogram signal, a process of converting the baseline of the electrocardiogram waveform by linear approximation through this process, and a process of converting the baseline of the electrocardiogram waveform into the converted electrocardiogram waveform. On the other hand, there is a process of performing averaging at an appropriately determined heart rate using the R wave as a reference, and a process of evaluating the ST level for the waveform obtained by this averaging. The recognized information is transferred to RAMI 8, display means 19, etc.

As can be seen from the above, amplifier] 1 to 13. The analog multiplexer 14 and the A/D converter 15 form each part of the input means, and the CPU 16 functions as a P-Q segment recognition means, a baseline conversion means, an averaging means, and an ST level evaluation means. There is.

As described above, the P-Q segment is recognized and the baseline of the electrocardiogram signal is converted by linear approximation. the result,
Even if the electrocardiogram signal induced from the subject contains drift due to respiratory wave 9 body movement, etc., this drift can be effectively removed, and further averaging can be performed to remove drift components and streaks that could not be removed by linear approximation. The influence of artifacts such as electrogram components can be reduced to a negligible extent.

Therefore, according to the present invention, it is possible to correctly evaluate the ST level without being disturbed by drift and/or artifacts.

[Brief explanation of drawings]

Figure 1 is a block diagram clearly showing the configuration of the present invention, and Figure 2 (
at to (c) are schematic diagrams for explaining the operation of each part in FIG. 1. 3 is a block diagram of an embodiment of the present invention, and FIG. 4 is a flowchart for explaining the operation of the apparatus of the present invention shown in FIG. 2: P-Q segment recognition means, 3: Basic conversion means, 4: Addition and averaging means, 5: S-T level evaluation means, 6: R liquid detection means, 11.12, 13: Amplifier, 1
4: Analog multi-buoy 1>)- Kusa, 15: A/D converter, 16: CPU
(IJ-only memory), 18: RAN (random access memory), 19: display means, 20: clock oscillator. Patent applicant: Advance Development Institute Co., Ltd. (Figure 1, Day 2) (a)

Claims (1)

[Claims] R wave detection means, P-Q segment recognition means. It has a baseline conversion means, an averaging means, and an ST level evaluation means, the P-Q segment recognition means recognizes the P-Q segment from the electrocardiogram signal, and the baseline conversion means converts the P-Q segment of each heartbeat into a straight line. approximating it as a base line of the electrocardiogram waveform, and using the R wave obtained by the R wave detection means as a base coating for the electrocardiogram waveform whose base line has been converted,
An apparatus for recognizing an abnormal electrocardiogram, characterized in that the averaging means performs averaging at a constant heart rate, and the ST level of the obtained waveform is evaluated by the ST level evaluation means.