What is ST Segment Depression of the Left Arm?

ST segment depression is a heart condition that is found with electrocardiography. When heart abnormality is suspected, the electrical activity of the heart can be externally recorded by an electrocardiogram.

Causes

• Although the presence of ST segment depression is often caused by myocardial ischemia (a restriction of blood to the heart), it can also be caused by rapid heart rate and electrolyte irregularity.

Benefits

• During exercise testing, ST segment depression is also used as a predictor of coronary artery disease.

What is a normal ST segment?

• A normal ST segment is flat. It extends from the end of the S wave and curves upward to the beginning of the T wave.

Identification

• ST segment depression is described as "horizontal," "up sloping" or "down sloping."

Fun Fact

• Pain coming from a heart problem often radiates through the left arm.