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ECG test

The electrocardiogram is the most frequently used test method when heart disease is suspected. Specifically, by recording the current flowing through the muscles of the heart from the surface of the body, the state of the electrical activity of the heart is made into a graph, which is useful for the diagnosis and treatment of heart disease. With various heart diseases, subtle electrical changes occur in the heart. It is possible to capture the electrical changes before the onset of symptoms.

A typical electrocardiogram is a 12-lead electrocardiogram with 4 limb leads and 6 chest leads attached to the chest. ECG examinations are broadly divided into 1) resting electrocardiogram, 2) 24-hour Holter electrocardiogram, and 3) exercise-loaded electrocardiogram. At our clinic, resting electrocardiogram and 24-hour Holter electrocardiogram are available.

1. Resting electrocardiogram

It is used for general examinations such as health examinations. It is possible to detect diseases such as arrhythmia and myocardial infarction. This is a very important test, but it should be noted that there are limits to the diseases that can be detected by the resting electrocardiogram. For example, an arrhythmia can only be detected when it is present. The resting electrocardiogram usually records only a few seconds, so it cannot be detected unless there is an arrhythmia in that short time. The same is true for angina, which cannot be detected without testing when there are symptoms. Myocardial infarction is a disease that is one step ahead of angina and is often possible with a resting electrocardiogram. In many cases, resting electrocardiogram can be used to diagnose sudden onset acute myocardial infarction or unstable angina, which is a severe angina that may lead to myocardial infarction. Cardiac hypertrophy, especially left ventricular hypertrophy, can also be diagnosed with an electrocardiogram. In other words, if there is an abnormality in the resting electrocardiogram, it is necessary to further examination. If there is no abnormality, it does not mean that there is no illness.


2. Holter ECG (24-hour ECG)

24 hours holter ECG  is in order to investigate arrhythmia and chest pain  record the electrocardiogram. With the advancement of equipment, it is as small as a card.

The average number of heartbeats for adult, is said to be about 100,000 times a day . The Holter ECG records all 100,000 heartbeats and is used to consider the following:

 1.Number of arrhythmias

It can be known what percentage of the total. Although it depends on the type and symptoms of arrhythmia, it is generally considered to be acceptable if it is 10% or less.

2. Types of arrhythmia

It is possible to distinguish between supraventricular arrhythmias from the atrium, which is the upper room of the heart, and ventricular arrhythmias, which are from the ventricle, which is the lower room. In addition, it is possible to distinguish between tachyarrhythmia in which the pulse becomes faster and bradyarrhythmia in which the pulse becomes slower. Since the treatment policy differs depending on the type of arrhythmia.

3. Risk of arrhythmia

It is possible to infer whether the arrhythmia is a life-threatening severe arrhythmia. Dangerous arrhythmias can lead to sudden cardiac death and require immediate treatment.

4. Matching arrhythmia and symptoms

Holter ECG tests are often set to press a button when symptoms occur. By examining the electrocardiogram near the button being pressed in detail, it is possible to examine what kind of arrhythmia.

5. Presence or absence of myocardial ischemia

It is possible to investigate whether myocardial ischemia is occurring during Holter ECG. Angina cannot be diagnosed accurately without an electrocardiogram when chest pain. Holter ECG is a useful test to detect angina. It is especially useful for diagnosing coronary spasm angina caused by coronary artery spasm, which is a typical example of resting angina. In addition, asymptomatic myocardial ischemia may occur, especially in diabetes. Even in that case, 24-hour monitoring with Holter ECG can detect the condition of myocardial ischemia.

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