Mean Arterial Pressure (MAP) – Blood Vessels and Pressure

by Thad Wilson, PhD

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    So now let's take a step back, use Ohm's Law and try to use this across the whole body instead of just one blood vessel. To do this, we use the determination of mean arterial pressure. We'll have to determine then what is systemic vascular resistance and then we can determine what cardiac output is. So these are going to be the three variables that we're going to deal with. Okay, so let's talk through which ones are which. So MAP is abbreviation for mean arterial pressure. That is going to be the cardiac output times systemic vascular resistance plus central venous pressure. This can be seen quite well over here on the diagram on your right. If central venous pressure is low such as 0, you can utilize this equation by dropping the central venous pressure term. You might ask, is central venous pressure usually 0? It's in between 0 and 4. Mean arterial pressures are much higher, maybe in the order of 95 mmHg. So when you look at a central venous pressure, it is very low and oftentimes people will drop that portion of the equation just to make things simpler. So in this case, we have mean arterial pressure approximates cardiac output times systemic vascular resistance. Knowing what cardiac output equals allows us to do another substitution. Cardiac output is simply the product of heart rate times stroke volume. That's the number of beats of the heart times the stroke volume or the output per beat. You multiply those two together times systemic vascular resistance and again you can approximate mean arterial pressure. So now how do you use mean arterial pressure to get to the flow that you want to look at? First thing about mean arterial pressure to kind of grab hold and that...

    About the Lecture

    The lecture Mean Arterial Pressure (MAP) – Blood Vessels and Pressure by Thad Wilson, PhD is from the course Vascular Physiology.

    Included Quiz Questions

    1. 108 mmHg
    2. 72 mmHg
    3. 138 mmHg
    4. 55 mmHg
    1. Glucose in blood
    2. Cardiac output
    3. Stroke volume
    4. Heart rate
    5. Systemic vascular resistance

    Author of lecture Mean Arterial Pressure (MAP) – Blood Vessels and Pressure

     Thad Wilson, PhD

    Thad Wilson, PhD

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