Tag Archives: axis deviation

Why learn axis?

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A few weeks ago on JEMS Connect there was a thread called Vectors, Axis and Cardiology. In it, Dave M. asked: I truly enjoy learning and studying the heart, how it works and why it works that way. I had the privilege of teaching a paramedic class today and going over the vectors and axis […]

Axis Determination – Part VI

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By now you can predict the QRS axis in the frontal plane within 15 degrees as long as you have an equiphasic (or isoelectric) lead in the frontal plane. So what constitutes a normal QRS axis? What is a left axis deviation? A right axis deviation? If you don’t have a copy of the hexaxial […]

Axis Determination – Part V

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In Part IV, I promised that I’d show you a fascinating relationship between the standard 12 lead ECG and the hexaxial reference system. You will recall that to use the hexaxial reference system, you find the most equiphasic (or isoelectric) lead in the frontal plane (first 6 leads of the 12 lead ECG) and look […]

Axis Determination – Part IV

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By now you should have a fairly good grasp of how the hexaxial reference system is derived from the first 6 leads of the 12 lead ECG. Before we break down the finished diagram, let’s look at the hexaxial reference system laying on top of the patient’s anterior chest, with the arrows and leads in […]

Axis Determination – Part III

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In Part II, 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 […]

Axis Determination – Part II

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In Part I, 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 […]

Axis Determination – Part I

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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 […]

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Comments
michelle
68 Year Old Male: Chest Tightness – Part 1
i see some depression and slight elevation in the st segment in the avr. i would alert the stemi crew to stand by.
2015-07-27 17:15:03
sean morrison
68 Year Old Male: Chest Tightness – Part 1
It's the big one Weezy! LAD
2015-07-27 12:48:03
Brooks Walsh MD
Computer misses it, but the medic catches it.
Well this blog is a great place to start! We cover most every aspect of emergency electrocardiography, with a variety of authors, and multiple perspectives, usually in a clinical context. If it is a book you are looking for, I prefer Ken Grauer's. I started with Dr Grauer as a paramedic student and I still…
2015-07-27 01:45:18
michelle
63 Year Old Female, CC: Neck and Arm Pain
looks like stemi . o2 , fluids, monitor and transport to nearest facility.
2015-07-26 16:24:04
The Six-Step Method for 12-Lead ECG Interpretation | EMS 12 Lead
Axis Determination – Part I
[…] 2.) Axis determination […]
2015-07-26 13:08:05

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