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Risks
By Mayo Clinic staffAn electrocardiogram is a safe procedure. There may be minor discomfort, similar to removing a band-aid, when the electrodes are removed. Rarely, a reaction to the electrodes may cause redness or swelling of the skin. A stress test, in which an ECG is performed while you exercise or after you take medication that mimics effects of exercise, may cause irregular heartbeats. This side effect is caused by the exercise or medication, not the ECG itself.
There isn't any risk of electrocution during an electrocardiogram. The electrodes placed on your body only record the electrical activity of your heart. They don't emit electricity.
