RESUMO
The traditional diagnosis of myocardial infarction relies primarily within the exhibited patient's clinical presentation, electrocardiographic changes, and elevation in cardiac markers. Since the clinical presentation can be highly variable and EKG changes are not readily present for all patients, the use of markers of cardiac injury to support the diagnosis of myocardial infarction has become a fundamental part of the evaluation of a patient with suspected acute coronary syndrome. In 2007 the Joint European Society of Cardiology/ American College of Cardiology Committee for the Redefinition of Myocardial Infarction concluded that the main criteria for myocardial infarction should be a rise or fall of cardiac biomarkers (namely cardiac troponins and CK-MB) along with: (1) ischemic symptoms, (2) ischemic changes in EKG, (3) Q waves in EKG, or (4) imaging evidence of loss of myocardial viability or (5) wall motion abnormalities. These changes have increased search interests for more sensitive and specific markers of acute myocardial injury; furthermore, dedicated research has commenced in order to specifically allocate markers that could even predict myocardial ischemia. Therefore this article will review traditional employment of cardiac markers, providing current insight, information and experimental data with respect to emerging markers of myocardial ischemia.