In our solar system, nearly all planets follow a specific pattern. As they move around the Sun, they also spin on their own axes. Most of these planets rotate in an anticlockwise direction. This ...

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).