In a “normal” electrocardiogram (ECG), the transition of the QRS axis in the precordial leads occurs between leads V 3 and V 4 (i.e., there is a dominant S in V 3 and a dominant R in V 4).

👉 Learn how to rotate a figure and different points about a fixed point. Most often that point of rotation will be the origin, but it is important to understand that it does not always have to be at ...