JPS5945381B2 - Electrocardiograph - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrocardiograph suitable for screening in mass medical examinations and the like.

It is said that an electrocardiogram must be deciphered by a doctor with a certain amount of experience and specialized training.

In recent years, the number of electrocardiograms that need to be deciphered has increased significantly in order to prevent adult diseases, and it is no longer possible for a small number of doctors to handle the process.

For this reason, attempts have been made to process electrocardiograms using computers to facilitate diagnosis, or to make diagnoses using computers themselves.

However, in recent years, it has been increasingly included as a test item in mass medical examinations for the prevention of adult diseases, etc., and even if a huge number of cases are to be processed by a computer installed in a limited area, it will be a heavy burden.

Therefore, it is necessary to perform a certain level of screening before accurately interpreting the electrocardiogram.

Even in screening, it takes considerable effort to decipher electrocardiograms that vary in width for each subject.

An object of the present invention is to provide an electrocardiogram interpretation device suitable for screening in mass medical examinations and the like.

The electrocardiograph according to the present invention is provided with a recording paper or a fluorescent screen surface that displays a standard electrocardiogram waveform at the same heart rate as the heart rate of the subject, and also displays the phase of the electrocardiogram waveform of the subject according to the standard. It is constructed by providing a recording speed adjusting means for matching the phase of the electrocardiogram waveform.

As is well known, when changes in cardiac potential are induced from the body surface, an electrocardiogram having a waveform as shown in FIG. 1 is obtained.

The P wave corresponds to the contraction of the atrium, the QR8 corresponds to the contraction of the ventricle, and the T wave corresponds to the expansion of the ventricle.

This waveform is repeated every heartbeat.

Furthermore, the electrocardiogram waveform differs slightly depending on the induction method.

The standard limb leads (Lead ■, Lead ■, Lead ■) are most commonly used.

A waveform like that shown in FIG. 1 cannot be obtained from an electrocardiogram of a person with heart-related abnormalities.

For example, the electrocardiogram of a person experiencing premature ventricular contractions is as shown in FIG.

In the electrocardiograph according to the present invention, a recording paper or a firefly is used that displays in advance an electrocardiogram waveform of a normal person with the same heart rate as the subject's heart rate and a standard electrocardiogram waveform having a certain width that is allowed as the normal range. The optical screen IJ +7 is equipped with means for adjusting the recording speed, that is, means for pausing, fast-forwarding, or slow-forwarding so that the phase of the subject to be measured matches the phase of the standard electrocardiogram waveform. It is something.

An embodiment of an electrocardiograph to which the device of the present invention is applied will be described below with reference to FIG. 3, which is a block diagram.

An electrical signal representing a change in the cardiac potential of the subject 1 is input to the preamplifier 3 through the lead selector 2 using an electrode lead cord.

The preamplifier 3 also receives a calibration voltage from a calibration voltage application circuit 4 and stabilized power from a calibration power supply 5.

The output from the preamplifier 3 passes through a combined instrument sensitivity switch 6 and is input to a main amplifier 7.

A thermal pen type oscillograph 8 is operated by the output from the main amplifier 7, and at the same time, a recording paper feeding mechanism 9 is operated by the AC power supply 5, so that an electrocardiogram 10 is created on the recording paper.

The electrocardiograph according to the present invention is stored to be supplied to the recording paper feeding mechanism 9, and one that displays a standard electrocardiogram waveform at the same heart rate as the subject's heart rate is supplied to the mechanism in a timely manner. The recording paper 11 is provided with a recording paper 11 which is adapted to be rotated, and a recording speed adjusting means 12 which temporarily stops, fast-forwards or slows down recording.

Generally, the recording paper feeding speed of an electrocardiograph is 2FM7W/s or 50mm/s, but in the electrocardiograph of the present invention, a standard electrogram waveform of the same heart rate as the subject's heart rate is prepared in advance. A record paper displaying this is prepared, and a record feed adjustment means is attached that has functions such as temporarily stopping the record paper in order to match the phase of the standard electrocardiogram waveform with the phase of the electrocardiogram waveform of the subject with the same heartbeat. Therefore, each part of the measured waveform and the standard waveform, which have substantially the same phase width, P, Q, R, S, T, or U, is compared.

The standard electrocardiogram waveform A in FIG. 4 shows the normal range of the allowable upper limit A1 and lower limit A2 with respect to the center A3, and the measurement waveform B superimposed with this in the same phase is drawn.

In such a case, if there is a part of the measured waveform that deviates from the normal range of the standard waveform, the subject is considered to be abnormal and is screened.

In the above embodiments, the case using recording paper was explained, but even in cases where the recording paper is not used, such as those using a cathode ray tube oscilloscope, the same heart rate and the same heart rate as the subject's heart rate can be used. The standard electrocardiogram waveform is displayed on a fluorescent screen (the standard electrocardiogram waveform corresponding to each heart rate is stored in advance on a floppy desk, etc. and displayed at the appropriate time), and the phase of the measured electrocardiogram is matched using a recording speed adjustment means. In this way, abnormalities can be screened in the same way.

Note that the heart rate of the subject is the average value of the results of continuously measuring heartbeats over a certain period of time.

Since the present invention is based on the configuration as described above, it is possible to easily screen a large number of subjects for abnormal electrocardiograms in mass medical examinations, etc., and its utility value is extremely large.

[Brief explanation of the drawing]

FIG. 1 is an electrocardiogram waveform diagram of an example of a normal person, FIG. 2 is an electrocardiogram waveform diagram of an example of an abnormal person, FIG. 3 is a configuration diagram of an embodiment of the electrocardiograph according to the present invention, and FIG. 1 is an example of an electrocardiogram recorded by the electrocardiograph of the invention. 1... Subject, 2... Lead selector, 3, 7... Amplifier, 5... AC power supply, 8... Thermal pen type oscillograph, 9... Record paper feed Mechanism, 10... Electrocardiogram, 11
...Recording paper, 12...Recording speed adjustment means, A...
Standard electrocardiogram waveform, B...Measured electrocardiogram waveform.

Claims (1)

[Claims] 1 Recording paper or fluorescent screen surface that displays a standard electrocardiogram waveform at the same heart rate as the subject's heart rate, and a record that matches the phase of the subject's electrocardiogram waveform with the phase of the standard electrocardiogram waveform. An electrocardiograph comprising a speed adjustment means.