The recording of electrical activity in the heart to examine the operation of the heart muscle and the neural transmission system. Voltages boosted by a current amplifier (amplifier) ??are usually stored on heat sensitive paper. Potential changes of the heart by electric activity of the heart are spread to the whole body with the help of the tissues around the heart and especially the blood.
The electrical changes caused by the conducting ends (electrodes) placed in various parts of the body are amplified and recorded. ECG is helpful in diagnosing cardiac diseases when the physician evaluates it with signs and symptoms that are found in the examination, and when other diognosis and films are taken into account.