Complete Picture of the Cardiac Cycle – Cardiac Cycle

by Thad Wilson, PhD

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    Now, we're going to connect two big points here. We've talked about the cardiac cycle and we talk about the cardiac cycle over time. Why? Because there is a time component to the ECG. We went through all of these different items, such as there’s an R-R interval, there's a P-R interval, there's a Q-T interval. They'll have specific, specific times. That helps us understand how the heart works in sequence. But to really understand the function of the heart, we’re going to have to plot the graph in a little different manner. To do this, we are going to flip two of the axes. We’re going to remove time out of the equation and we’re going to put this left ventricular volume from being on its own in the cardiac cycle, we’re going to slide it over to the x-axis. And on the y-axis, all we’re going to have is left ventricular pressure, which is seen here in the solid red line above. So, let's now talk through what things happen in a pressure-volume curve. Make sure you follow along this very carefully, so that you can link everything back to the cardiac cycle because I've taught this for many years and I know that it's very easy to understand the cardiac cycle with all of its different components. You know you have a contraction. You have relaxation. You have filling. You have all these things that come in sequence. Some people don't see the sequence on a pressure-volume curve as quickly, but as soon as you do, you will now have insight and ways that you can now express changes in the cardiovascular system that you don't have the ability to express with the cardiac cycle. So, if we plot left ventricular volume on the X, left ventricular...

    About the Lecture

    The lecture Complete Picture of the Cardiac Cycle – Cardiac Cycle by Thad Wilson, PhD is from the course Cardiac Physiology.

    Included Quiz Questions

    1. End-systolic volume -end-diastolic volume
    2. End-systolic volume +end-diastolic volume
    3. Cardiac output× heart rate
    4. End-systolic volume - cardiac output
    5. End-systolic volume ÷end-diastolic volume
    1. Ventricular filling
    2. Atrial filling
    3. Isovolumetric contraction
    4. Ventricular ejection
    5. Atrial contraction

    Author of lecture Complete Picture of the Cardiac Cycle – Cardiac Cycle

     Thad Wilson, PhD

    Thad Wilson, PhD

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