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
Anthony Garlick
68 y.o. male with weakness: “Treat the monitor, not the patient?”
So my working clinical impression would be hypoglycaemia with possibly dehydration and an electrolyte imbalance. Reasoning for this is that the patient frusemide and metolazone are both diuretics are known to cause these problems. ECG does have a wide and bazar QRS complex with ? ? AV disassociation plus what looks to be peaked T…
2014-09-30 22:22:35
jason
68 y.o. male with weakness: “Treat the monitor, not the patient?”
I'm with Dave Eastman on this. I think it's hyper K+ and will treat as such. But I'll do that will I head to the PCI capable facility. Do I think there is an underlying STEMI? Nope, I sure don't. Do I know the computer has a hard time with false positives? yup. Am I…
2014-09-28 22:15:54
Rodrigo Furtado
68 y.o. male with weakness: “Treat the monitor, not the patient?”
I did forget, is it possible pacer is placed??? sorry that went right over my head.
2014-09-28 20:38:19
Rodrigo Furtado
68 y.o. male with weakness: “Treat the monitor, not the patient?”
1) Change to every lead? STEMI is questionable on my Dx # 6 on a list of 5. IF my recall on this, IF a Global presentation of ST change with QRS Change: a) STEMI is extremely unlikely or NOT STEMI b) start looking for mechanical problems ( tamponade) or chemical/ electrical (electrolyte imbalance or…
2014-09-28 20:34:36
Dave Eastman
68 y.o. male with weakness: “Treat the monitor, not the patient?”
My first thought was hyperkalemia. If the pt is stable, begin with Ca++ & bicarb. Consider albuterol. Serial 12-leads. Start toward PCI capable facility. If it is hyperkalemia, initial treatment should begin to improve pt's condition and there is no harm caused from the increased transport time. If there is an underlying MI as well,…
2014-09-28 18:05:12

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