What might ST segment depression during exercise suggest?

ST segment depression during exercise is significant because it often indicates that the heart muscle is not receiving enough oxygenated blood, suggesting ischemia. This condition can arise due to coronary artery disease (CAD) or other factors that restrict blood flow. When the heart is stressed during exercise, it normally increases blood flow to meet heightened oxygen demands. However, if there are narrowed or blocked coronary arteries, this process can be compromised, leading to ST segment depression on the EKG.

In a healthy individual, the ST segment remains flat or may even elevate slightly during physical exertion; any depression could prompt further investigation into potential cardiovascular issues. While it is essential to consider various factors that can affect EKG readings, ST segment depression is primarily associated with ischemic changes, making it a critical signal for potential underlying coronary artery disease.