JPH08229014A - Electrocardiograph - Google Patents

Abstract

PURPOSE: To reduce the load on an operator and allow him to conduct electrocardiogram inspections for many people in a short time by detecting the quality of the fitted states of electrodes and input wave-forms, judging the quality of them, and automatically starting electrocardiogram inspections when set conditions are satisfied. CONSTITUTION: Impedance detecting circuits are incorporated in amplifiers 1AA-1AN of an input system A, and the fitted state of each electrode is converted into the impedance signal between the electrode and the right leg electrode and inputted to an electrode off detection section 4 via an input switching unit 2. When the level of the impedance signal is a threshold value or below, the electrode is judged to be not fitted. When it is the threshold value or above, the electrode is judged to be fitted. A record start judgment section 6 collates the information on the electrode fitted state, the high-frequency noise level, and the base line inclination outputted from the electrode off detection section 4 and a wave-form quality detection section 5 with the start conditions of a start condition memory section 7, and it sends a record state command to a memory section 9 when the start conditions are satisfied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrocardiograph, and more particularly to an electrocardiograph capable of automatically starting a test and switching input systems.

[0002]

2. Description of the Related Art Generally, in electrocardiography, when a technician or a nurse wears a chest electrode and a limb electrode on a subject and the electrocardiograph has a needle deflection or a waveform display function, After confirming the mounting condition of the electrodes and the quality of the input waveform by the displayed waveform, the inspection was started by key operation.

Further, particularly in group medical examinations and the like, when performing electrocardiographic examination of a large number of persons using an electrocardiograph having two electrocardiographic input means, the input systems are alternately switched by key operation. It was

[0004]

However, when performing an electrocardiographic examination according to the above-mentioned procedure, it is necessary to operate a key when starting an examination or switching the input system. It is necessary to move back and forth between the bed and the electrocardiograph many times in order to attach electrodes and operate the electrocardiograph, and time efficiency is reduced, especially when a large number of people are examined in group examinations. There were problems such as working and giving fatigue to laboratory technicians and nurses.

[0005]

In the electrocardiograph of the present invention, the means for detecting the mounting state of the electrodes, the means for detecting the quality of the input waveform, and the mounting state of the electrodes and the quality of the input waveform are good. It has a means for setting conditions for determining whether or not it can automatically start an electrocardiogram examination when the set conditions are satisfied, and further has an electrocardiogram input means for two systems, if one has an electrocardiogram for one system. When the inspection is completed,
It is characterized by being able to automatically switch to the other system.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings.

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

The electrocardiogram waveform signal induced from the electrode of the input system A attached to the subject is amplified by the amplifier 1 and then input to the input switch 2. In the initial state, the input system A is selected in the input switching device 2, and the induced electrocardiogram waveform signal passes through the input switching device 2 and the A / D converter 3
And is converted into a time-series digital electrocardiogram waveform signal. On the other hand, the amplifier 1 of the input system A has a built-in impedance detection circuit, and the mounting state of each electrode is converted into a potential difference between each electrode and the right foot electrode, that is, an impedance signal. This impedance signal is input to the electrode dislodgement detection unit 4 via the input switch 2.

In the electrode displacement detection section 4, it is determined that the input impedance signal is not attached when the level is above a certain threshold value, and is attached when it is below the threshold value. In the present embodiment, since the impedance of each electrode is measured with the right foot electrode as a reference, it is possible to detect the wearing state of the electrodes other than the right foot. This is because it is not possible to distinguish between the case where only the right foot electrode is not attached and the case where all other electrodes are not attached.

The waveform quality detector 5 detects the mixing state of noise in the above-mentioned ECG waveform. In this embodiment, the hum as shown in FIG. 2 (AC disturbance caused by AC power source)
The high-frequency noise level such as the electromyogram or the electromyogram is measured in the unit of mV (millivolt) as an average value in a certain section of the electrocardiogram waveform. In addition, regarding the fluctuation of the baseline (baseline shift) as shown in FIG.
It is measured in units of V / sec.

In the recording start determination unit 6, information on the electrode mounting state, the high frequency noise level and the inclination of the baseline, which are the outputs of the electrode displacement detection unit 4 and the waveform quality detection unit 5, is stored in the start condition storage unit 7. Check the start conditions that are set.

The contents of the start condition storage unit 7 can be changed at any time by an operation from the operation unit 8. FIG. 4 shows an example of the setting contents of the start condition. The content of [] in FIG. 4 can be set. In the item of the electrode of FIG. 4, * is set when the mounting state of the corresponding electrode is checked. Threshold values are set for the high frequency noise level and the slope of the baseline.

When the start condition is satisfied in the comparison with the start condition in the recording start determination unit 6, a recording start instruction is issued to the recording unit 9. When the start condition is not satisfied, the content and the guide name are displayed on the display unit 10. For example, when the V6 induction electrode is removed, for example, "electrode removal ... V6" is displayed.
By looking at this display, the operator can easily recognize the wearing state or the induction with poor waveform quality, so that the appropriate electrode can be reattached and the inspection efficiency can be improved.

When receiving the recording instruction, the recording unit 9 performs standard 12-lead electrocardiographic recording in a predetermined recording format as in the conventional automatic electrocardiograph, and the recording is automatically stopped after the recording. During the recording, the operator attaches the electrodes of the input system B to the next subject in order to prepare for the electrocardiogram recording of the next subject.

When the recording is completed, the input selector 2 is switched to enable the electrocardiogram input from the input system B and the detection of the electrode displacement. The record from the input system B is also the above input system A
By the same processing flow as the recording from
The lead electrocardiogram is recorded, and when recording is completed, the input selector 2
Then, the electrocardiogram can be input from the input system A again. This is repeated thereafter.

As described above, the operator need only alternately wear the electrodes of the input system A and the electrodes of the input system B on the subject, so that the burden on the operator can be reduced and the mind can be reduced. Since it is possible to save the time for operating the electrometer, it is possible to perform an electrocardiogram test for a large number of people in a short time.

[0017]

As described above, the electrocardiograph of the present invention is
It has a means to detect the mounting condition of the electrode, a means to detect the quality of the input waveform, and a means to set the conditions for judging whether the mounting condition of the electrode and the quality of the input waveform are good. When the ECG examination is started, the ECG examination can be automatically started, and when the ECG examination means of two systems is provided, when the ECG examination of one system is completed, the system can be automatically switched to the other system. Therefore, since the operator only has to put the electrodes of the two input systems alternately on the subject, the burden on the operator can be reduced, and the time for operating the electrocardiograph can be saved. It has an effect that the electrocardiographic examination can be performed in a short time, and is particularly effective in electrocardiographic examination such as group examination.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing an example of high-frequency noise detected by the waveform quality detection unit shown in FIG.

FIG. 3 is an explanatory diagram showing an example of an electrocardiogram waveform representing a baseline inclination.

FIG. 4 is a chart showing a setting example of start conditions set in a start condition storage unit shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Amplifier 2 Input selector 3 A / D converter 4 Electrode displacement detection unit 5 Waveform quality detection unit 6 Recording start determination unit 7 Start condition storage unit 8 Operation unit 9 Recording unit 10 Display unit

Claims (4)

[Claims] 1. An electrocardiograph comprising at least an electrode to be attached to a subject for each lead, an amplifier for amplifying the output from the electrode for each lead, and a recording unit for recording the output of the amplifier. In the case where the output of the amplifier is within a predetermined range, the electrode attachment is judged to be normal and recording is continued, and the output of the amplifier is out of the predetermined range. An electrocardiograph, which is characterized in that it determines that the attachment of the electrode is not normal and stops recording. 2. An electrocardiograph comprising at least an electrode to be attached to a subject for each lead, an amplifier for amplifying the output from the electrode for each lead, and a recording unit for recording the output of the amplifier. In the case where the output of the amplifier has a quality within a predetermined range, the output of the amplifier is determined to be normal and recording is continued, and the output of the amplifier is out of the predetermined range. An electrocardiograph comprising: determining that the signal quality is not normal and stopping recording. 3. An electrocardiograph comprising at least an electrode to be attached to a subject for each lead, an amplifier for amplifying the output from the electrode for each lead, and a recording unit for recording the output of the amplifier. In the case where the output of the amplifier is within a predetermined range, the electrode attachment is judged to be normal and recording is continued, and the output of the amplifier is out of the predetermined range. Stops the recording when it is judged that the electrode mounting is not normal, and when the output of the amplifier is within a predetermined range of quality, it is judged that the output of the amplifier is normal and recording is continued. In addition, when the output of the amplifier is out of a predetermined range, it is determined that the signal quality is not normal, and recording is stopped. Electrocardiograph. 4. An electrocardiogram input system of two systems having two systems of electrocardiogram input, and when an electrocardiogram test is completed in the recording unit by the electrocardiogram input of one system, a signal from the recording unit indicates the completion of the test. 4. The electrocardiograph according to claim 1, wherein the electrocardiograph is switched to another electrocardiogram input system by an input selector, and the following electrocardiogram examination is subsequently carried out.