25
edits
ST Morphology: Difference between revisions
no edit summary
mNo edit summary |
No edit summary |
||
| Line 17: | Line 17: | ||
{{clr}} | {{clr}} | ||
{{box| | {{box| | ||
[[Image:changing_ST.svg|thumb|right| | [[Image:changing_ST.svg|thumb|right|240px|ST changes occur when the action potential in the ischemic area changes, resulting in an electric injury current from the healthy cardiomyocytes towards the ischemic area during the repolarization fase.]] | ||
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>. | 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>. | ||