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Mean Electrical Axis and Determining Axis on ECG – Electrocardiogram

by Thad Wilson, PhD
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    Okay. Let's combine our augmented leads – aVR, aVL, aVF – with our standard limb leads, 1, 2, and 3. So, now, we have six different pictures of the heart around one single plane. So, this is along the frontal plane here. And each of the arrow tips represent where the positive pole is. So, the negative pole is on the opposite side of the arrow. A depolarization traveling towards a positive pole is going to give you a positive deflection. And again, the maximal positive deflection will be closest to that mean vector. And then, you need to look at what is the wave perpendicular, meaning that it would be a 90° angle from the line that you drew from that particular axis that had the highest deflection point. Okay, we’ll come back to this and revisit it a couple of times, but just have that in your mind as we move forward. One plane, this plane right here; six different views, you have them. And we can all put them around one circle. And algebraically, one circle is 360°. So, we're going to give certain leads a degree. And this is going to be a helpful way for us to assess if someone's heart is normal or not based upon what degree their mean electrical axis might be. Okay. We need to build on some of that process and that is we need to talk about what really is a mean electrical axis. A mean electrical axis should be somewhere in between about negative 30 to 100. That's the normal range for mean electrical axis. Some people will say that normal is in between 0 and 90, and that's okay too. I'm just giving you a little bit wider range. Not everybody always agrees in medicine what is...

    About the Lecture

    The lecture Mean Electrical Axis and Determining Axis on ECG – Electrocardiogram by Thad Wilson, PhD is from the course Cardiac Physiology.


    Included Quiz Questions

    1. +120°
    2. -150°
    3. -30°
    4. +60°
    1. … 30 to 100
    2. ... 50 to 90
    3. …10 to 50
    4. … 90 to 100
    5. … 20 to 110
    1. … +90°
    2. … +70°
    3. … -120°
    4. …+120°
    5. … +30°

    Author of lecture Mean Electrical Axis and Determining Axis on ECG – Electrocardiogram

     Thad Wilson, PhD

    Thad Wilson, PhD


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