What does ST depression on an EKG typically indicate?

ST depression on an electrocardiogram (EKG) is typically indicative of myocardial ischemia, which occurs when blood flow to the heart muscle is reduced, leading to insufficient oxygen supply during periods of increased demand, such as during exercise or stress. This is often observed in situations where there is a blockage in the coronary arteries, leading to an imbalance between oxygen supply and demand in the heart.

In cases of ST depression, the pattern suggests that the heart is not receiving enough oxygen-rich blood, which translates to ischemic changes in the myocardium. This can help clinicians identify patients who may be experiencing unstable angina or other forms of ischemic heart disease.

Normal cardiac function does not present with ST depression; rather, a normal EKG would show all segments in their expected state without any such deviations. Additionally, while myocardial infarction can present with ST segment changes, those changes usually manifest as ST elevation. Ventricular hypertrophy is characterized by other EKG changes, such as increased voltage or specific patterns, rather than ST segment depression.

Thus, identifying ST depression as a sign of ischemia is critical for prompt diagnosis and management of potential cardiac events.