ST segment
ST Segment
The ST segment (pronounced "ess tee segment") is a component of the electrocardiogram (ECG or EKG) that represents the interval between ventricular depolarization and repolarization.
Etymology
The term "ST" comes from the initial letters of the words "Systole" and "Tachycardia". "Systole" (from the Greek systole meaning "a drawing together or a contraction") refers to the phase of the heartbeat when the heart muscle contracts and pumps blood from the chambers into the arteries. "Tachycardia" (from the Greek tachys meaning "swift" and kardia meaning "heart") is a condition that makes your heart beat more than 100 times per minute.
Pronunciation
ST Segment is pronounced as /es tiː ˈsɛɡmənt/.
Related Terms
- QRS complex: The combination of three of the graphical deflections seen on a typical electrocardiogram.
- T wave: Represents the repolarization of the ventricles.
- PR interval: Measures the time it takes for the electrical wave to travel from the sinus node through the AV node.
- QT interval: Measures the time taken for the ventricles to depolarize and then repolarize.
- ST elevation: Refers to a finding on an electrocardiogram wherein the trace in the ST segment is abnormally high above the baseline.
- ST depression: Refers to a finding on an electrocardiogram, wherein the trace in the ST segment is abnormally low below the baseline.
External links
- Medical encyclopedia article on ST segment
- Wikipedia's article - ST segment
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