-when myocardial oxygen supply does not meet demand.
-there is no tissue death
-the T wave is inverted or ST segment is depressed
-since the ventricles are closest to the chest leads, the T wave changes will be most prominent there
Injury-
-Injury indicated the acuteness of an infarct
-the ST segment elevation denotes injury
-the ST segment may be only elevated as much as 10 or more mm above the baseline
Infarction-
-if there is a ST elevation, this means that the infarction is acute
-the ST segment will elevate with an acute infection, and then return to the baseline
-Pericarditis can cause diffuse ST segment elevation
-A ventricular aneurysm can cause ST segment elevation
-The diagnosis of a MI is usually made by the presence of Q waves with the St elevation
-It is important to be able to recognize the location of the infarction
Anterior STEMI
-See ST elevation in leads V1, V2, V3, and V4. V1 and V2 is sometime referred to as septal leads
Lateral STEMI
-See ST elevation in leads I, avL, V5 and V6. Will see Q waves
Inferior STEMI
-See ST elevation in leads II, III and avF and Q waves
Posterior Wall STEMI
-there is ST depression in leads V1 and V2
-since the posterior wall of the left ventricle depolarizes in a direction of the anterior infarction
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