ECG Abnormalities – Electrocardiogram

by Thad Wilson, PhD

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    So, now, let's get into some of the pathologies. You can see what a normal ECG wave looks like. It has a normal P wave. It has a normal QRS complex. It has a T wave. These are all important electrical properties of the heart. If someone has a disorder called atrial fibrillation – the top portion of the heart is the atrium. And these two atrium will show up as the P wave. Therefore, if you have atrial fibrillation, you should see abnormalities with the P wave and you can see that. Usually, what happens is there's a lot of small jittery – what looks like noise in front of the QRS complex. That is denoted as atrial fibrillation. A first-degree AV block is a block and where you have a normal P wave, but it takes too long to capture a QRS complex. And how do you know it's too long? It’s greater than 0.2 seconds. That is a first-degree AV block. A second-degree AV block is more serious than a first. It means that there are certain times when you have a P wave and you don't capture a QRS complex. Therefore, there is some block in the AV system that's preventing it from getting through. A first-degree AV block is just slowing down. The second-degree AV block involves some QRS complexes that are not captured from that P wave. The most serious is a third-degree AV block and here you can see a number of P waves with no normal QRS complexes. If there are QRS complexes that are generated, they are generated ectopically and therefore, have a wide QRS complex. How do I know it's wide? It’s greater than 0.01 seconds. That’s where all those intervals become important. You have to be able to identify...

    About the Lecture

    The lecture ECG Abnormalities – Electrocardiogram by Thad Wilson, PhD is from the course Cardiac Physiology.

    Included Quiz Questions

    1. 1st-degree AV block
    2. 3rd-degree AV block
    3. Atrial fibrillation
    4. Ventricular fibrillation

    Author of lecture ECG Abnormalities – Electrocardiogram

     Thad Wilson, PhD

    Thad Wilson, PhD

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