Review of PaO₂ (Nursing)

by Rhonda Lawes, PhD, RN

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    00:01 Hi, welcome to our video series on impaired oxygenation.

    00:06 Now, I titled this one, not all PaO2 are created equal, because everyone who's in nursing needs to have an understanding of the PaO2/FiO2 ratio. Ready? This is gonna be really fun.

    00:21 By the time we're done with this, I promise you, you'll be able to apply this in the clinical setting.

    00:26 Now first, let's talk about what PaO2 is? I know you've probably heard this name before, but I want to make sure you're really clear on what it is.

    00:35 Now, I can't even talk about this till you look at this beautiful graphic that I've got there for you.

    00:41 You're looking at one of the alveoli.

    00:44 So we're looking at alveolus.

    00:45 You see that oxygen is coming in down from the top, right.

    00:49 You'll notice that the alveoli has direct contact with the capillary.

    00:54 Now you've got some basement membranes in there, but that's where the magic happens.

    00:59 That's where the gas exchange happens.

    01:02 So we're talking about a normal range for a PaO2 is 80 to 100.

    01:08 Now that's really important.

    01:11 Okay, so make sure that one is one that you keep revisiting, because you'll need to know the a normal range is 80 to 100.

    01:19 But I'm going to show you in the rest of the video again, not all PaO2 are the same.

    01:24 In fact, you can have a normal PaO2 and really be in significant respiratory problems.

    01:31 So PaO2 actually stands for Partial pressure of oxygen in the...

    01:38 you got it alveoli.

    01:40 Which is why we took some time to talk about that picture before we've been looked at this.

    01:44 So we know normal level is 80 to 100.

    01:47 PaO2 means Partial pressure of oxygen in the alveoli.

    01:51 Because the pressure of oxygen dissolved in the arterial blood is the same thing as the number reference we use for PaO2.

    02:00 It's actually a measurement of how well oxygen is moving from the lungs to the blood.

    02:05 Okay, so that means the alveoli.

    02:09 So PaO2 gets a pretty good example of what's going on in these little alveoli, or like you see a single one here.

    02:17 So it's a measurement, gives us an actual number that we can quantify that tells me how well oxygen is moving from the alveoli into the bloodstream.

    02:28 Now, these are normal ABG values.

    02:30 You know, the disclaimer I used before all lab values.

    02:34 Each and every individual lab might have a little different normal value.

    02:39 For us, we're going to use these values pH 7.35 to 7.45.

    02:44 CO2 35 to 45.

    02:47 PaO2, 80 to 100 is pretty standard.

    02:51 Bicarb 22 to 26 and the Sat 95 to 100.

    02:56 Whoa...

    02:57 Okay, so, first thing I want you to keep in mind, PaO2 is partial pressure of oxygen in the blood, right? That's an arterial measurement.

    03:07 We're talking about a pulse ox.

    03:09 That's something that you either put a clip on someone's finger, maybe even on their nose, on their ear, depending on what you have.

    03:16 And that reads a saturation.

    03:19 This is not nearly as accurate as a PaO2.

    03:23 So if I'm a nurse in a clinical setting, I want you to know the most accurate is if you've drawn an appropriate arterial blood gas sample the PaO2 is a more accurate, clear, concise, objective measurement of what's going on in your patient's lungs and bloodstream.

    03:40 All right, when I see a formula like this, I get a little verklempt because it looks real complicated.

    03:46 Here's the good news.

    03:48 We don't have to do this.

    03:50 Highly trained, educated people in the lab, run this for us.

    03:54 But I want you to understand how complicated this is, and how amazing it is that we can measure this.

    04:02 So PaO2, the partial pressure of oxygen in the arterial blood takes the barometric pressure.

    04:09 It's represented here by the letters PB.

    04:12 Now they subtract the water vapor pressure.

    04:14 Usually it's about 47 mm Hg.

    04:18 Next, we've got the fractional concentration of inspired oxygen.

    04:23 That's what you here referred to as FiO2.

    04:28 What's the next part of it? Well, we look at the gas exchange ratio.

    04:33 None of that you need to know.

    04:35 But what you do need to know is that we do some pretty amazing things in our lab.

    04:41 Those are highly educated, bright people.

    04:44 So when you interact with them as a colleague, please remember that be kind, respect what they do, and you're going to get a lot better results for your patient.

    About the Lecture

    The lecture Review of PaO₂ (Nursing) by Rhonda Lawes, PhD, RN is from the course Acute Respiratory Distress Syndrome (ARDS) (Nursing).

    Included Quiz Questions

    1. The PaO2 measures the amount of oxygen in the blood
    2. The PaO2 measures the amount of oxygen in the lungs
    3. The normal range for PaO2 is 60-100 mmHg
    4. The normal range for PaO2 is 35-45 mmHg
    1. Drawing an arterial blood sample
    2. Counting the client's respirations
    3. Obtaining a pulse oximetry reading with a finger probe
    4. Taking a CT scan of the client's lungs

    Author of lecture Review of PaO₂ (Nursing)

     Rhonda Lawes, PhD, RN

    Rhonda Lawes, PhD, RN

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