The electrocardiogram is a quick, simple, painless procedure in which the heart’s electrical impulses are amplified and recorded. This record, the electrocardiogram (also known as an ECG), provides information about the part of the heart that triggers each heartbeat (the pacemaker, called the sinoatrial or sinus node), the nerve conduction pathways of the heart, and the frequency and heart rate. Sometimes the ECG may show that the heart is enlarged (usually due to high blood pressure) or that the heart is not getting enough oxygen due to a blockage in one of the blood vessels that feed the heart (the coronary arteries).

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