We are the Best in Electrocardiogram (ECG)
Electrocardiography is the process of producing an
electrocardiogram (ECG or EKG[a]), a recording – a graph of voltage versus time
– of the electrical activity of the heart using electrodes placed on the skin.
These electrodes detect the small electrical changes that are a consequence of
cardiac muscle depolarization followed by repolarization during each cardiac
cycle (heartbeat). Changes in the normal ECG pattern occur in numerous cardiac
abnormalities, including cardiac rhythm disturbances (such as atrial
fibrillation and ventricular tachycardia), inadequate coronary artery blood
flow (such as myocardial ischemia and myocardial infarction), and electrolyte
disturbances (such as hypokalemia and hyperkalemia).
In a conventional 12-lead ECG, ten electrodes are
placed on the patient's limbs and on the surface of the chest. The overall
magnitude of the heart's electrical potential is then measured from twelve
different angles ("leads") and is recorded over a period of time
(usually ten seconds). In this way, the overall magnitude and direction of the
heart's electrical depolarization is captured at each moment throughout the
cardiac cycle.
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