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ST Morphology: Difference between revisions
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[[Image:normal_ST_elevation.png|thumb|Examples of normal ST elevation]] | [[Image:normal_ST_elevation.png|thumb|Examples of normal ST elevation]] | ||
[[Image:pathologic_ST_elevation.png|thumb|Examples of pathologic ST elevation. [[LVH]], [[LBBB]], [[Pericarditis]], [[Hyperkalemia]], [[Anterior AMI]] ]] | [[Image:pathologic_ST_elevation.png|thumb|Examples of pathologic ST elevation. [[LVH]], [[LBBB]], [[Pericarditis]], [[Hyperkalemia]], [[Anterior AMI]] ]] | ||
The most important cause of '''ST elevation''' is '''acute [[Ischemia]]'''. Other causes are <cite>Wang</cite><cite>Werf</cite>: | The most important cause of '''ST elevation''' is '''acute [[Ischemia]]'''. Other causes are <cite>Wang</cite><cite>Werf</cite>: | ||
*Early repolarization | *Early repolarization | ||
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An important clue for the diagnosis of ischemia is the presence of [[Ischemia|reciprocal ST depression]]. | An important clue for the diagnosis of ischemia is the presence of [[Ischemia|reciprocal ST depression]]. | ||
[[Image:early_repol.png|thumb|left|Characteristics of early repolarization]] | |||
'''Early repolarization''' is a term used for ST elevation without underlying disease. It probably has nothing to do with actual early repolarization. It is commonly seen in young men. It is important to discern early repolariztion from ST elevation from other causes such as [[ischemia]]. Characteristics of early repolarization are:<cite>Kambara</cite> | '''Early repolarization''' is a term used for ST elevation without underlying disease. It probably has nothing to do with actual early repolarization. It is commonly seen in young men. It is important to discern early repolariztion from ST elevation from other causes such as [[ischemia]]. Characteristics of early repolarization are:<cite>Kambara</cite> | ||
* an upward concave elevation of the RS-T segment with distinct or "embryonic" J waves | |||
* slurred downstroke of R waves or distinct J points or both | |||
* RS-T segment elevation commonly encountered in the precordial leads and more distinct in these leads | |||
* rapid QRS transition in the precordial leads with counterclockwise rotation | |||
* persistence of these characteristics for many years | |||
* absence of reciprocal ST depression | |||
{{clr}} | {{clr}} | ||