,       +86-18915970836  / +86-25-86703826
You are here: Home / Blog / Product News / How do ECG machines work?

How do ECG machines work?

Views:0     Author:Site Editor     Publish Time: 2021-08-24      Origin:Site

Elelctrocardiograph machine is short for ECG machine or EKG machine.Poweam Medical supply single channel ecg, three channel ecg, six channel ecg and tweleve ecg machine.But how does ECG machine work?Whether it is a routine examination or a cardiac diagnosis, many people have already had an ECG test. But what is it actually measuring and what does the ECG curve show? Our nerve cells and muscle cells communicate with each other through electrical and chemical signals. Regular electrical signals also control our heartbeat. These signals are sent by a group of cells in the right atrium. These cells are called the sinoatrial node (SA node). They spread through the myocardium in the form of tiny electrical pulses. This first causes the atria to contract and then the ventricles to contract. The way these signals travel through the heart can also be measured on the surface of our skin. The electrocardiogram measures these changes in electrical signals (actually voltage) in different areas of the skin and plots them into graphs. The resulting electrocardiogram is called an electrocardiogram. Here is how the ECG machines work.


The following knowledge points are listed below:

Ø What does an ECG machine show?

Ø What does the ECG test involve?

Ø What kind of test an ECG are done?

Ø What do the results of a 12-lead ECG show?

1.  What does an ECG machine show?

The electrocardiogram is used to observe the function of the heart. It mainly records the frequency (heart rate) and the rhythm of the heartbeat (heart rhythm). It can provide us with important information, such as possible narrowing of the coronary arteries, heart attack or irregular heartbeat such as atrial fibrillation.

If the heart beats steadily, it will produce a typical ECG pattern: the first peak (P wave) shows how electrical impulses (excitement) propagate in the two atria of the heart. The atria contract (squeeze), pump blood into the ventricles, and then immediately relax. The electrical pulse then reaches the ventricle. This can be seen in the Q, R, and S waves of the ECG, called the QRS complex. The ventricles contract. Then the T wave shows that the electric pulse stops spreading and the ventricles relax again.

The electrocardiogram can detect heart disease and irregular heartbeat. What they look like and how they develop can help us find the root cause.

2. What does the ECG test involve?

The electrical activity of the heart can be measured on the surface of the skin, even far away from the heart, such as on your arms or legs. The standard "12-lead ECG" uses a total of 10 electrodes: 6 are placed on your chest, and then on your forearms and calves. If there is too much body hair, shave these parts first; otherwise, no preparation is required. These electrodes are connected to the electrocardiograph through cables. The machine converts the received signal into an electrocardiogram and saves it. Some machines can also print out the chart..

3. What kind of test an ECG are done?

l Resting ECG:

This includes lying flat with bare chest. During the test, you should lie down calmly and comfortably, because straining your muscles, moving, coughing or shaking will affect the test results. The actual measurement takes about one minute, up to five minutes.

l Exercise ECG:

It measures your heart electrical activity while your physical activity. This usually includes riding an exercise bike. By making it more and more difficult to turn the pedal, the force is gradually increased to a higher level. If there are any abnormalities in the ECG, the test will stop early. In addition to the electrocardiogram, this test also provides power data in watts. Your blood pressure will also be checked regularly.

l Holter:

The electrical activity of the heart is usually recorded within 24 hours. Three to four electrodes are attached to your chest, and a small recording device is worn on your belt or hung around your neck. Subsequently, the ECG data is transferred to the doctor's office computer for analysis. In order to do this, the doctor also needs information about your daily schedule (such as unusual events, physical activity, and sleep). For example, if you only have an irregular heartbeat for a period of time, but it is not displayed in the "normal" ECG, you can use a Holter monitor.

4. What do the results of a 12-lead ECG show?

The 12-lead ECG takes advantage of the fact that the signal from the heart spreads unevenly across the skin. The device compares the signal strength between the two electrodes-doctors call these measurements "wires." For example, one of the wires is measured with two electrodes on the arm. The 12-lead ECG, as the name suggests, is used to measure 12 leads.

Based on the leads that show irregularities, the expert can find out things such as where the myocardial infarction occurred, or whether the heart rhythm problem came from the left ventricle or the right ventricle.


After reading this article, you may know how the ECG machines work now.

Our company also has many products about Patient Monitor and Anesthesia Machine. Welcome to consult!




China: No.18 Fenghua Road,Yuhua Economic Development Zone, Nanjing City, Jiangsu Province, China

UK: 419 Harborne Road, Edgbaston, Birmingham, England.





Contact us

Copyright © 2020 Poweam Medical