ST elevation: Difference between revisions
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==Differentiating the Causes of ST Segment Elevation== | ==Differentiating the Causes of ST Segment Elevation== | ||
==See also== | ==See also== |
Revision as of 20:37, 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
Common Cuases
Causes in Alphabetical Order
- Acute MI or heart attack
- Brugada syndrome
- Coronary vasospasm
- Early repolarization
- Hyperkalemia and this is known as a dialyzable current of injury
- Intracranial hemorrhage
- Left bundle branch block
- Left ventricular aneurysm
- Pericardiocentesis with contact of the needle with the myocardium creating a current of injury
- Pericarditis[1][2]
- Prinzmetal's angina
- Pulmonary embolism
- Short QT syndrome (some variants)
- Vasospastic angina
Differentiating the Causes of ST Segment Elevation
See also
References
- ↑ 1.0 1.1 Tingle LE, Molina D, Calvert CW (2007). "Acute pericarditis". Am Fam Physician. 76 (10): 1509–14. PMID 18052017. Unknown parameter
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ignored (help) - ↑ 2.0 2.1 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)