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Cardiology Teaching Package. ECG Lead Placement. The system of positioning of leads for performing a 12-lead ECG is universal. This helps to ensure that, when a person's ECGs are compared, any changes on the ECG are due to cardiac injury, not a difference in placement of leads, this is extremely important with the increasing use of foreign travel.
These electrical signals are sent to the ECG machine, where they are processed, and printed out as an âECG tracing.â The electrodes are then removed. The ECG test takes less than 5 minutes to perform. What Does the ECG Tracing Look Like? The picture on this page shows a typical, normal ECG. The electrical signals generated from the ten electrodes have been processed into 12 âviewsâ of the heartâs electrical activity - the so-called 12-lead ECG.