*[[Miscellaneous#Cardiac contusion|Cardiac contusion]]
*[[Chamber_Hypertrophy_and_Enlargment|Left ventricular hypertrophy]]
*[[Idioventricular Rhythm|Idioventricular rhythm]] including [[Pacemaker|
In a study by Otto et al. among 123 patients with chest
paint and ST elevation of > 1 mm 63 patients did not have a myocardial infarction. Diagnoses in patients who did not have a myocardial infarction were [[LVH]] (33%) and [[LBBB]] (21%). <cite>Otto</cite> In daily practice this means that in these patients the diagnosis of myocardial infarction has to depend on other diagnostic means, such as laboratory tests, echocardiography and coronary angiography.
An important clue for the diagnosis of ischemia is the presence of [[Ischemia|reciprocal ST depression]].
[[Image:early_repol.png|thumb|none|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 repolarization 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
The most important cause of ST depression is [[Ischemia]]. Other causes of ST depression are:
*Reciprocal ST depression. If one
leads whos ST elevation than usually the lead 'on the other site' shows ST depression. ( this is mostly seen in [[ischemia]] as well.
*Left [[Chamber_Hypertrophy_and_Enlargment|ventricular hypertophy]] with "strain" or depolarization abnormality
*[[Electrolyte_disturbances|Low potassium / low magnesium]]
*Heart rate induced changes (post
*[[Clinical Disorders#ECG_changes_after_neurologic_events|During acute neurologic events]].