The coronary arteries are the blood vessels that supply the heart muscles with oxygen-rich blood. When the coronary arteries are narrowed, the heart muscles may only receive enough blood supply in the resting state. However, during exercise stress, the blood flow may be insufficient to meet the increasing oxygen demands of the heart muscles. This lack of blood supply causes symptoms such as chest pain (also known as angina) or shortness of breath, and may be a warning sign of a heart attack.
Exercise Treadmill ECG is a simple and safe test to detect the lack of blood flow to the heart muscles due to severe narrowing of the coronary arteries.