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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Cardiac Rhythm Analysis, 12-Lead ECG Interpretation, Resuscitation

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Comments
Vince DiGiulio
The 12 Leads of Christmas: V2
Your questions on this topic are some of the best I've encountered—no need to apologize! It makes me very happy to see this post reaching the right people. I'm working non-stop the next two days but I will get back to you soon with my full response. Two things to start: First, where did you…
2015-04-27 05:14:11
Aman
The 12 Leads of Christmas: V2
Thank you so much! I wonder why this information is not found in ECG texts. I have a query though. The critical information seems to be the fact that leads V1 and V2; V3; and V4-V6, each are physically located on a different transverse plane with respect to the theoretical electrical center. (Also mentioned in…
2015-04-26 18:24:06
Matthew
68 y.o. male with weakness: “Treat the monitor, not the patient?”
I lean toward what jason said above - Going to the PCI Hospital, but not activating the lab yet. Go with the Hyper K treatment enroute.
2015-04-26 13:34:57
Ken Grauer, MD
Understanding Digoxin
Digoxin is used much less frequently these days than in the past - when it was a drug that virtually every patient with heart failure was taking. As a result - many clinicians in modern times are far less familiar (and comfortable) with how to dose Digoxin. Digoxin pharmacokinetics are linear - You double the…
2015-04-16 03:27:43
Ralph A
Transcutaneous Pacing Success!!! Part 1
Oh that was great....!!
2015-04-11 01:34:07

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