Before understanding the dynamics of 12 Lead EKG interpretation, it is important to clearly understand the basic anatomy and physiology of the heart. This includes understanding why different rhythms occur and the consequences of those rhythms. So, let’s start by looking at basic A&P of the heart.
Right arm Lead I, Left arm Lead aVF. If right drops, RAD; if left drops, LAD. If both drop, combined L&RAD.