With the continuous advancement of medical technology, electrocardiogram has become a common tool to detect heart disease. It monitors and evaluates the electrical activity of a patient's heart, accurately delineating heart rhythms and abnormalities.

How to detect heart disease by electrocardiogram will be described in detail below.

Electrocardiography refers to the process of collecting and analyzing heart electrical signals on imaging equipment through electrodes. These electrical signals are produced by the contraction and relaxation of the heart muscle and can provide information about the rhythm and speed of the heartbeat.

Before an EKG test, patients should avoid caffeine, nicotine, and other substances that affect the electrical activity of the heart. Next, the doctor will stick the electrodes on the patient, usually on the extremities. The patient must then relax in order to obtain accurate results.

After doctors complete the ECG measurement, they evaluate the waveforms shown on the image. A normal ECG waveform should contain P waves, QRS waves, and T waves, and each waveform represents a different cardiac electrical signal. Abnormalities, such as ST-segment elevation or depression, and QT interval prolongation or shortening, may indicate heart disease. Doctors use detailed analysis of the EKG waveform to diagnose and identify specific types of heart disease.