Compare the frontal plane QRS vectorial display of the ECG showing the inferior infarction (right) to that of a normal ECG (left). In the normal tracing, there is a also a small initial vector and it, as in the tracing showing the inferior infarction, is directed superiorly and to the left. This initial vector reflects the small narrow Q waves in 2,3 and aVF. The main QRS vector, also similar to that in the tracing showing the infarction, has an axis of +60 degrees. The major difference between the two is in the amplitude and duration of the initial superiorly directed component, both of which are greater in the setting of the inferior wall infarction.