The saying, "What one does not know, one does not recognize", applies to the interpretation of the electrocardiogram. Recently a wealth of new information on the electrocardiogram has become avail- able by correlating electrocardiographic findings with information from new techniques such as His bundle recordings, programmed stimulation of the heart, 24-hour record- ing, and cardiac scintigraphy. Also, our knowledge about the electrocardiogram has...