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It consists of the recording and visualization of the trace of the electrical currents that are generated in the cells of the heart, and their conduction through the tissue of the heart. The electrocardiogram is carried out from electrodes (electrical conductors) applied on the surface of the skin, usually on both arms and legs and on the thorax.
The electrodes placed on the skin can detect these impulses and transmit them to the electrocardiograph by means of cables. Next, an electrocardiograph that includes a needle that moves up and down along a long strip of paper that traverses the device at a constant rate converts these impulses into points and depressions (stroke). The distance between, the hight up and down, all can be used to diagnose.
The ECG is very useful to determine if a person suffers from heart disease, chest pain, palpitations and if the heart is beating normally. If the individual is taking medicines that can affect the heart or if they have a pacemaker, the ECG can quickly determine the immediate effects of changes in activity or drug levels.
Electrocardiograms are useful to indicate: The presence of irregular heartbeats or arrhythmias (abnormal rhythms), if the heart beats very slowly, very fast or irregularly. The presence of lower blood supply or oxygen to the heart.
The presence of a heart attack (myocardial infarction), or if it is likely to happen. The part of the heart that may be affected. The presence of myocarditis (inflammation of the heart).
The electrocardiogram is totally harmless, not painful. When the discs or electrodes are applied for the first time, they may feel cold to the touch.
Very important to check anually for over 50 years of age
An electrocardiogram or ECG is a non-invasive test to record the electrical activity of the heart. The electrocardiogram can provide a lot of information about the heart and its functioning.
With this study, it is possible to find out more about the heart rate, the size, and functioning of the heart cavities, and heart muscle.
When changes occur in that line, the doctor can determine if there is a problem. For example, during a heart attack, the electrical activity of the heart changes, and that change is recorded on the ECG.