4,200
edits
ST Morphology: Difference between revisions
m
no edit summary
mNo edit summary |
mNo edit summary |
||
| Line 17: | Line 17: | ||
{{clr}} | {{clr}} | ||
{{box| | {{box| | ||
[[Image:changing_ST.png|thumb|right|300px|ST changes occur when the endocardial and epicardial actionpotentials | [[Image:changing_ST.png|thumb|right|300px|ST changes occur when the endocardial and epicardial actionpotentials cease to counterbalance each other]] | ||
The '''ST segment''' represents ventricular repolarisation. Repolarisation follows upon contraction and depolarisation. During repolarisation the cardiomyocytes elongate and prepare for the next heartbeat. This process takes much more time than the depolarisation. Repolarisation is not passive elongation by stretch, it is an active process during which energy is consumed. On the ECG, the repolarisation phase starts at the junction, or ''j point'', and continues until the ''T wave''. The ST segment is normally at or near the baseline. | The '''ST segment''' represents ventricular repolarisation. Repolarisation follows upon contraction and depolarisation. During repolarisation the cardiomyocytes elongate and prepare for the next heartbeat. This process takes much more time than the depolarisation. Repolarisation is not passive elongation by stretch, it is an active process during which energy is consumed. On the ECG, the repolarisation phase starts at the junction, or ''j point'', and continues until the ''T wave''. The ST segment is normally at or near the baseline. | ||