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| __NOTOC__
| | #Redirect [[ST interval#ST Elevation]] |
| {{SI}}
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| {{CMG}}
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| ==Overview==
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| ST elevations refers to a finding on an [[electrocardiogram]] that often reflects injury to the heart muscle or myocardium.
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| ==Pathophysiology==
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| [[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]].
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| 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.
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| ==Causes==
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| ===Common Cuases===
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| *[[Acute MI]] or [[heart attack]]
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| *[[Early repolarization]]
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| *[[Left ventricular aneurysm]]
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| *[[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>
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| ===Causes in Alphabetical Order===
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| *[[Acute MI]] or [[heart attack]]
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| *[[Early repolarization]]
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| *[[Intracranial hemmorrhage]]
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| *[[Left bundle branch block]]
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| *[[Left ventricular aneurysm]]
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| *[[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>
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| *[[Pulmonary embolism]]
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| ==Differentiating the Underlying Causes of ST Elevation==
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| ST elevation in select leads is more common with [[acute MI]], and ST elevation in all leads is more common with acute [[pericarditis]].
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| ==See also==
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| * [[ST segment]]
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| * [[ST depression]]
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| ==References==
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| {{Reflist|2}}
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| [[Category:Cardiology]]
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| [[Category:Electrophysiology]]
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