ST segment

ST segment is a component of the electrocardiogram (ECG) that represents the interval between ventricular depolarization and repolarization. The ST segment is the flat section of the ECG between the end of the S wave and the beginning of the T wave.

Overview

The ST segment is an important part of the ECG as it can indicate the presence of certain heart conditions such as myocardial infarction (heart attack) and angina pectoris. The ST segment can be either elevated (ST elevation) or depressed (ST depression), and these changes can be indicative of ischemia or injury to the heart muscle.

ST Segment Elevation

ST segment elevation is a condition where the ST segment is raised above the baseline in the ECG. This is often a sign of acute myocardial infarction, but can also be caused by conditions such as pericarditis and Brugada syndrome.

ST Segment Depression

ST segment depression is a condition where the ST segment is lowered below the baseline in the ECG. This can be a sign of myocardial ischemia, or lack of blood flow to the heart muscle. It can also be caused by conditions such as hypokalemia and digitalis toxicity.

Clinical Significance

Changes in the ST segment can be indicative of serious heart conditions and should be evaluated by a healthcare professional. The ST segment is an important part of the ECG and changes in its shape or position can provide valuable information about the health of the heart.

See Also

• Electrocardiogram
• Myocardial infarction
• Angina pectoris
• Pericarditis
• Brugada syndrome
• Hypokalemia
• Digitalis toxicity

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