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ST Morphology: Difference between revisions
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==The Normal ST segment== | |||
The ''ST segment'' represents the 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 fase 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 the 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 fase starts at the junction, or ''j point'', and continues until the ''T wave''. The ST segment is normally at or near the baseline. | ||
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==ST elevation== | ==ST elevation== | ||
[[Image:stelevatie_en.png|thumb|ST elevatie | [[Image:stelevatie_en.png|thumb|ST elevatie is measured 1,5 or 2mm (=60ms or 80ms) after the junctional or j-poin.<cite>Gibbons</cite>]] | ||
The most important cause of '''ST elevation''' is '''acute [[Ischemia]]'''. Other causes are <cite>Wang</cite><cite>Werf</cite>: | |||
*Acute pericarditis: | *[Miscellaneous#Pericarditis|Acute pericarditis]: ST elevation in all leads except aVR | ||
*Longembolie : V1 en aVR | *Longembolie : V1 en aVR | ||
*Hypothermie : V3-V6, II, III en aVF | *Hypothermie : V3-V6, II, III en aVF | ||
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#Wang pmid=14645641 | #Wang pmid=14645641 | ||
#Werf pmid=12559937 | #Werf pmid=12559937 | ||
# | #braunwald isbn=0808923056 | ||
</biblio> | </biblio> | ||
<analytics uacct="UA-807577-6"></analytics> | <analytics uacct="UA-807577-6"></analytics> | ||