After an acute myocardial infarction, the cardiologist cannot discard data regarding myocardial viability. The most frequently used diagnostic methods for this are echocardiographic or scintigraphic techniques; unfortunately, these techniques are operator sensitive or expensive. However, also by simple electrocardiography is it possible to obtain important information about myocardial viability, in an objective and economic way. There are three electrocardiographic modifications potentially related to myocardial viability: 1) spontaneous modifications after an acute myocardial infarction: early or late T wave normalization, and Q wave regression; 2) exercise-induced modifications: ST segment elevation, T wave normalization, ventricular arrhythmias; 3) dobutamine-induced modifications: ST segment elevation and T wave normalization. In this editorial, the authors report the literature data on the various electrocardiographic signs and analyze their accuracy and utility in myocardial viability assessment.