Category Archives:

Cardiac Axis Determination – Part 3

Entry Img

In Part 2 we discussed the heart’s mean electrical vector and how Einthoven’s Triangle (leads I, II, and III) can be redrawn to form the first 3 spokes of the hexaxial reference system. Essentially, we ended up with a shape like the one on the right. When leads I, II, and III are drawn this […]

Cardiac Axis Determination – Part 2

Entry Img

In Part 1, we looked at Einthoven’s Equilateral Triangle and Einthoven’s Law, and I told you that it was the key to understanding the formation of the hexaxial reference system. But before we delve further into the hexaxial reference system (the instrument we’ll be using to calculate the heart’s QRS axis) we need to address […]

Cardiac Axis Determination – Part 1

Entry Img

Few subjects related to 12 lead ECG interpretation provoke more controversy (or anxiety) than axis determination. It is controversial in that not everyone agrees it is a necessary skill for prehospital providers to learn. It is anxiety provoking in that it can be difficult to understand, especially when taught poorly. I am of the opinion […]

Page 46 of 46« First...102030...4243444546