Lectures

ECG Tracing: Definitions and Related Cardiac Timing – Electrocardiogram

by Thad Wilson, PhD
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    Now, it's important to go through an ECG step-by-step and name the various waves. And you might be familiar with some of the naming of these waves, but let's go through them again, so everybody's on the same page because we have this down, then we can add pathology later on. But until you know the waveforms, unfortunately, we can’t get to that point, and that's the fun part. So, now you have to learn the waves. The first is the P wave. The P wave corresponds to atrial depolarization. So, that’s the top part of the heart depolarizing. The next thing we have is called the PR interval, and so that is from the start of the P wave to the start of the QRS complex. The QRS complex is ventricular depolarization. So, as you can imagine, the top part of the heart depolarizing is important, right? But, really, where are you pushing the blood from the top of the heart? Just to the bottom part of the heart. Where are you pushing the blood from the bottom part of the heart? Out throughout the whole body or all through the lungs. So, it’s a longer distance you are pushing the blood out as you go through the ventricles. That's why the QRS complex is so important because it's pushing blood out throughout the whole body or throughout the lungs. The next interval we have is called the QT interval and that goes from the start of the QRS complex all the way to the end of the T wave. We have something called the ST segment. The ST segment is from the end of the S wave to the start of the T wave. And the final thing we have is called the T wave and the T...

    About the Lecture

    The lecture ECG Tracing: Definitions and Related Cardiac Timing – Electrocardiogram by Thad Wilson, PhD is from the course Cardiac Physiology.


    Included Quiz Questions

    1. Isoelectric depolarized state of the ventricles
    2. Ventricular depolarization
    3. Ventricular repolarization
    4. Atrial depolarization
    1. R R interval
    2. P R interval
    3. QRS interval
    4. ST interval
    5. T wave interval
    1. End of the S wave to the beginning of T wave
    2. End of the QRS complex to the start of T wave
    3. End of the S wave to the end of T wave
    4. Start of the S wave to the beginning of T wave
    5. End of the QRS complex to the end of T wave

    Author of lecture ECG Tracing: Definitions and Related Cardiac Timing – Electrocardiogram

     Thad Wilson, PhD

    Thad Wilson, PhD


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