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049 What Stroke Volume is and How to Calculate It

Stroke Volume = EDV – ESV What do these mean? Watch to learn more and understand about stroke volume. Enjoy!

Transcript of Today’s Episode

Hello and welcome to another episode of Interactive-Biology TV where we’re making Biology fun. My name is Leslie Samuel and before I get into this episode, I just want to send a shout out to Richard Morris and his friend, Nathan. Richard sent me an email a few days ago letting me know that they appreciate the videos and that they have watched every single video that I have published here at the Interactive Biology TV. And that is just awesome. Richard and Nathan, I hope you have gotten a tremendous amount of value and, I hope that you continue to get a tremendous amount of value from the videos that you are watching here at Interactive-Biology TV.

I know there are so many of you out there that have been watching the videos and, I want to let you know how much I appreciate every minute that you spend watching these videos. Thank you for every comment that has been left. Thank you for every question that have been asked and all of the feedback that I’ve been getting.

It is just tremendous to know that this is helping so many people all over the world. So, thank you, thank you, thank you.

Inside this episode, Episode 49, I’m going to be talking about what is stroke volume and how to calculate it. So, let’s just get right into it.

When I’m talking about stroke volume, I’m talking about the amount of blood that is pumped by one ventricle during each heart beat. So, we know that the heart beats and, we know that blood comes into the heart, and when the ventricle contracts, it pushes that blood out to the rest of the body and to the lungs.

We’ve looked at this in detail, in Episode 44. If you need to review that, you can go back to Episode 44 to check out those details.

Here, we’re looking at the heart. Right now, we’re just going to look at the left ventricle. What is happening is blood is coming into the left atrium and then into the left ventricle. When it reaches in the left ventricle, after a short period of time, the ventricles contract and that pushes blood, as you can see here, pushes the blood out into the aorta and that then goes to the rest of the body.

That’s a brief overview but, once again, you can go back to Episode 44 to check out more details about that. There are a few definitions that I want you to know.

Definition number one: systole. Systole is the contraction of the heart. Then we have diastole and that’s the relaxation of the heart. So, systole is contraction, diastole is relaxation then, we have the End Diastolic Volume or the EDV which is the amount of blood in the ventricle right before ventricular contraction.

So, right before the ventricle contracts, the amount of blood that we have in the ventricle, we call that the End Diastolic Value which makes sense. It’s right at the end of diastole so, that’s the End Diastolic Volume. Then, of course we have the End Systolic Volume which is the amount of blood left in the ventricle right after the ventricular contraction. So, when the ventricles contract, and it pushes the blood out to the lungs and out to the rest of the body, the amount of blood we have left over, that is the end systolic volume which, once again, makes sense because its at the end of systole.

With those definitions, let’s look at the graph. All right. So, what we have here is a graph. On the x-axis we have time and on the y-axis we have volume in milliliters so, we’re looking for the amount of blood in the ventricle. For this example, we’re going to talk about the left ventricle which is the one that pushes the blood into the aorta to go to the rest of the body.

Let’s say, ventricular contraction has just finished. When that contraction is finished, the ventricles start to get filled with blood again. After that contraction, another cycle starts where blood flows into the ventricle. Here we have blood getting into the ventricle.

At a certain point, we’re going to have a more rapid filling, and when it reaches this point, and we’re not going to talk about too many details where this part is concerned. We’re going to talk more about that in a later episode. But, let’s say this is the point where the ventricle contracts.

What’s going to happen here is, when the ventricle contracts, that’s going to push the blood out of the ventricle and it’s going to go to the rest of the body. Here we have a certain amount of blood and here we have a certain amount of blood. The amount of blood that we have in here, right before the contraction, we’re going to call that the EDV. Once the contraction is over, we’re going to call that the ESV.

The way we calculate the stroke value is SV is equal to EDV minus ESD: SV= EDV – ESD.

If the end diastolic volume is 120 mL of blood and the end systolic volume is around, let’s say, it’s 50 mL. The stroke value is going to be 120ml minus 150 mL and that is going to be equal to 70 mL. I just realized here that I wrote 5. I meant to put 50 so, I’m just going to put that 0 here. So 120 minus 50 = 70. Seventy would be my stroke volume. Again, ventricle fills with blood, the ventricle contracts.

At a certain point, the ventricle contracts that pushes the blood out of the ventricle and to the rest of the body. At the end of the contraction, we have an end systolic volume. If the end systolic volume is 50 mL and the end diastolic volume is 120 mL, the stroke volume will be 120 minus 50 and that is going to be equal to seventy.

That’s pretty much it for this episode. Of course, if you want to see more, you can go to Interactive-Biology.com where we have more Biology videos and many other resources. We’re adding to the resources on a regular basis to try to help make Biology fun. That’s it for this video and I’ll see you on the next one.

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Leslie Samuel is the creator of Interactive Biology. His mission is to use this site to Make Biology fun for people all over the world.

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140 Responses to “049 What Stroke Volume is and How to Calculate It”

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    @petercourt Oh hey, Not a problem. Glad to see people interacting with the
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    So helpful!!! What would I do without you?!

    • Leslie April 5, 2011 at 10:22 pm #

      lol. Glad you are finding the videos helpful Kate. What would you do without me? You’d survive, but biology might not be as FUN :D

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  6. Everett June 1, 2011 at 7:16 pm #

    I take it that these calculations are for just the left ventricle contraction, or do they consider the right ventricle as well? I’m guessing that systolic volume is only calculated from the left ventricle because that is the ventricle that pumps fresh blood to the system. Thanks for the excellent video. :)

    • Lrsamuel June 3, 2011 at 3:03 pm #

      Going from the name, I’m guessing (pretty sure though) that it’s based on the pressure in the larger arteries, which is pretty similar to the left ventricle. The pressure in the right ventricle is significantly lower because it’s only sending the blood to the lungs, which is a relatively short distance.

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  128. GingaGJenkins August 10, 2013 at 4:16 pm #

    Awsome video quick question im currently a emt and im tryin to understand perfusion better. In my text books it says perfusion depends on cardiac output and that cardiac output is determined by multipling stroke volume by heart rate all of this I understand. However im wondering what is used to measure stroke volume is there a machine that does this or can it be determined by vitals or a ekg. I guess what im asking is can SV be determined in the feild or does it require a hospital setting thanks

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  133. Mike Simons October 17, 2013 at 1:29 pm #

    Is there a normal range for stroke volume?

  134. Lindsay Sara October 21, 2013 at 10:48 am #

    I am an EMT-B as well. Cardiac output can’t really be determined in the field. Just know that cardiac output has an influence on blood pressure. The equation for blood pressure is BP= CO x TPR. So the CO can influence the blood pressure which you get in the field. To fully understand the basics I recommend taking anatomy 1 & 2. But if your a basic, you will most likely never use this. Just know what the vitals should be, and what variations could mean.

  135. Kristin Henriksen October 31, 2013 at 12:36 pm #

    I have learned so much from your videos! Thank you sooooooooo much for these. You are making my online education interactive, really!

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    I’ve been watching all your cardio videos today! really enjoying your clear and understandable explanations. thank you :)
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  137. Tom Kekys December 14, 2013 at 9:48 pm #

    very good review..and easily understood