However, there is much more information concerning the exact site of the infarct related lesion, prediction of final infarct size, and estimation of prognosis that can be obtained from the initial ECG without extra costs or time. 1, 2 Patients are diagnosed as having anterior, inferior-posterior, or lateral myocardial infarction based on the patterns of ST deviation and assessment of risk is usually based on simple crude measurements of the absolute magnitude of ST segment deviation or the width of the QRS complexes. Patients with ST elevation or new left bundle branch block are usually referred for immediate reperfusion therapy, whereas those without ST deviation or those with predominately ST depression are usually treated conservatively initially.
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