ST elevation: Difference between revisions
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==Overview== | |||
ST elevations refers to a finding on an [[electrocardiogram]] that often reflects injury to the heart muscle or myocardium. | |||
==Pathophysiology== | |||
[[ST segment]] corresponds to a period of ventrical [[Systole (medicine)|systolic]] [[depolarization]], when the cardiac muscle is contracted. Subsequent relaxation occurs during the [[Diastole|diastolic]] [[repolarization]] phase. The normal course of [[ST segment]] reflects a certain sequence of muscular layers undergoing repolarization and certain timing of this activity. When the cardiac muscle is damaged or undergoes a pathological process (e.g. [[inflammation]]), its contractile and electrical properties change. Usually, this leads to early repolarization, or premature ending of the [[Systole (medicine)|systole]]. | |||
The exact topology and distribution of the affected areas depend on the underlying condition. Thus, ST elevation may be present on all or some leads of ECG. | |||
==Causes== | |||
* [[Electrocardiography in myocardial infarction|ECG in myocardial infarction]] | * [[Electrocardiography in myocardial infarction|ECG in myocardial infarction]] | ||
* [[Left ventricular aneurysm]] | * [[Left ventricular aneurysm]] | ||
* [[Acute pericarditis]]<ref name="pmid18052017">{{cite journal |author=Tingle LE, Molina D, Calvert CW |title=Acute pericarditis |journal=Am Fam Physician |volume=76 |issue=10 |pages=1509–14 |year=2007 |month=November |pmid=18052017 |doi= |url=http://www.aafp.org/afp/20071115/1509.html}}</ref><ref name="pmid16228101">{{cite journal |author=Chew HC, Lim SH |title=Electrocardiographical case. ST elevation: is this an infarct? Pericarditis |journal=Singapore Med J |volume=46 |issue=11 |pages=656–60 |year=2005 |month=November |pmid=16228101 |doi= |url=http://www.sma.org.sg/smj/4611/4611me2.pdf}}</ref> | * [[Acute pericarditis]]<ref name="pmid18052017">{{cite journal |author=Tingle LE, Molina D, Calvert CW |title=Acute pericarditis |journal=Am Fam Physician |volume=76 |issue=10 |pages=1509–14 |year=2007 |month=November |pmid=18052017 |doi= |url=http://www.aafp.org/afp/20071115/1509.html}}</ref><ref name="pmid16228101">{{cite journal |author=Chew HC, Lim SH |title=Electrocardiographical case. ST elevation: is this an infarct? Pericarditis |journal=Singapore Med J |volume=46 |issue=11 |pages=656–60 |year=2005 |month=November |pmid=16228101 |doi= |url=http://www.sma.org.sg/smj/4611/4611me2.pdf}}</ref> | ||
==Differentiating the Underlying Causes of ST Elevation== | |||
ST elevation in select leads is more common with [[acute MI]], and ST elevation in all leads is more common with acute [[pericarditis]]. | |||
ST elevation in select leads is more common with MI, and ST elevation in all leads is more common with acute pericarditis. | |||
==See also== | ==See also== | ||
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==References== | ==References== | ||
{{Reflist}} | {{Reflist|2}} | ||
[[Category:Cardiology]] | |||
[[Category:Electrophysiology]] | |||
Revision as of 11:03, 23 September 2012
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
ST elevations refers to a finding on an electrocardiogram that often reflects injury to the heart muscle or myocardium.
Pathophysiology
ST segment corresponds to a period of ventrical systolic depolarization, when the cardiac muscle is contracted. Subsequent relaxation occurs during the diastolic repolarization phase. The normal course of ST segment reflects a certain sequence of muscular layers undergoing repolarization and certain timing of this activity. When the cardiac muscle is damaged or undergoes a pathological process (e.g. inflammation), its contractile and electrical properties change. Usually, this leads to early repolarization, or premature ending of the systole.
The exact topology and distribution of the affected areas depend on the underlying condition. Thus, ST elevation may be present on all or some leads of ECG.
Causes
Differentiating the Underlying Causes of ST Elevation
ST elevation in select leads is more common with acute MI, and ST elevation in all leads is more common with acute pericarditis.
See also
References
- ↑ Tingle LE, Molina D, Calvert CW (2007). "Acute pericarditis". Am Fam Physician. 76 (10): 1509–14. PMID 18052017. Unknown parameter
|month=ignored (help) - ↑ Chew HC, Lim SH (2005). "Electrocardiographical case. ST elevation: is this an infarct? Pericarditis" (PDF). Singapore Med J. 46 (11): 656–60. PMID 16228101. Unknown parameter
|month=ignored (help)