All people throughout life should repeatedly take ECG. Initially, to register human heart contentment, or so-called normal cardiac state. In the future, the condition of the general cardiac health of a person is compared with the above, for example, to confirm or rule out a state of illness.
ECG or electrocardiography allows you to graphically register and display the conduction of cardiac muscle from the surface of the body. The study is safe and painless. During the time of execution of ECG, the patient has to rest calmly, i.e., the patient should not move or speak. For recording ECG, the electrodes are attached to the patient’s wrists, to the thigh near the ankle joints and chest. Thus, 12 graphs are recorded at the same time, as the fluctuation of the electric field voltage at various points in the body surface reflects the excitement of the different regions of the heart. Each graphic figure meets with certain standard values for both temporal duration, shape and amplitude.
The ECG is a basic study for the diagnosis of cardiac ischaemia, myocardial infarction and cardiac arrhythmias. Unfortunately, a single-performed ECG may not rule out a disease, therefore, in case of reasonable doubt, the electrocardiography should be repeated after a period of time, or another cardiac examination method, such as a heart rate test, should be used to refine the diagnosis.