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ST Morphology

No change in size, 09:53, 18 January 2012
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[[Image:changing_ST.pngsvg|thumb|right|300px|ST changes occur when the endocardial and epicardial action potentials cease to counterbalance each other]]
The '''ST segment''' represents ventricular repolarization. Repolarization follows upon contraction and depolarization. During repolarization the cardiomyocytes elongate and prepare for the next heartbeat. This process takes much more time than the depolarization. The elongation that takes place during repolarization is not passive; it is an active process during which energy is consumed. On the ECG, the repolarization phase starts at the junction, or ''j point'', and continues until the ''T wave''. The ST segment is normally at or near the baseline. Minor STT changes are not necessarily associated with cardiac ischemia<cite>Lloyd</cite>.

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