The ST segment is the flat, isoelectric
section of the ECG between the end of the S wave (the J point) and the
beginning of the T wave.
It represents the interval between
ventricular depolarization and repolarization.
The most important cause of ST segment
abnormality (elevation or depression) is myocardial ischemia or infarction.
(source: lifeinthefastlane.com)
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