Can an ECG show a blockage?

An ECG does not detect blockages. However, it can show if you have possibly had a heart attack in the past which may be caused by blockages.

Are ECG tests painful?

ECG tests are not painful. The only discomfort you may experience is one similar to tearing off a bandage when the electrodes are removed from your skin surface.

As the electrodes used do not give out electricity, there is no way that the recording machine can give you an electric shock or affect your heart in any way.

ECG in Hong Kong: Usage, Types & Costs