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ECG is recording of the electrical activity of the heart.
Wires from the small machine are placed on a dozen parts in the body and the recording is done in a minute or two. It is often interpreted by the machine itself and reviewed by the doctor. It is done routinely – before any operation, any chest pain
and so on. In your case, it is a basic investigation for heart for safe anaesthesia and surgery..
Wishing speedy recovery