Arterial Blood Draw

Arterial Blood Draw


Hi, I’m Megan today we’re going to perform an arterial stick to get an arterial blood gas on this dog he has aspiration pneumonia and we are getting some pretty poor readings on our pulse ox and so an arterial blood gas is a really good way to get an accurate understanding of what’s actually happening inside his vessels so I’m going to use a special arterial blood gas syringe this syringe has little tiny tiny tiny micro holes in the plunger so that it will sell fill so to do this I’m going to need about a half a mil of blood so I just pull the plunger back and then when I poke this into his artery it will fill on its own in the air that’s now in the syringe will kind of come out of these little holes this little white ball here is lithium heparin so that’s going to be the anticoagulant when you do an arterial blood gas it’s important once you get your sample you don’t want to mix it with any room air so with this particular syringe it comes with a set up once i get my sample i’m going to remove the needle from the artery and immediately stick it into here all the air should be out of the syringe this is kind of a safety thing where the needle will kind of get stuck in there then i’m going to remove the needle and put this little stopper on the end of my syringe so that it doesn’t mix with any room air now getting a sample from the dorsal pedal artery is probably the easiest way to do it in a dog so the dorsal pedal artery is usually the best artery to use to get an arterial blood gas it’s on the medial side of the foot distal to the hawk so I’ve shaved an area and just kind of wipe it with some alcohol kind of clean any debris that’s on his skin and what I like to do is taking my left hand which is not the hand that i use to poke will try and locate the artery and feel it pulsing underneath my finger this dog has had some blood pressure challenges so it’s kind of faint but I can feel it under my finger so next I’m going to get my syringe ready and the nice thing about these is that I don’t have to worry about moving my hand around with the plunger I can just study it so feel for the pulse and then kind of using my left hand to help guide my right hand I’m just going to use a pretty conservative angle and I’m going to go through the skin and find the artery there’s a little bit of crunching artery walls or a little tougher than the vein walls and so you kind of have to to go through those so now the trick is just the whole really still and you can see that it is self filling the syringe when I remove my needle I’m just going to put pressure over this artery with my left hand that’s already on there I’m going to pull out immediately into there and then I’m actually going to hand this off I’ve got Meredith here and she’s going to immediately take that and run the sample you don’t want arterial samples to wait very long again you don’t want them to mix with any room air so I’m just going to apply some pressure over this artery I’m going to put this band-aid on a little bit tighter than I would if this were a vein and I’m going to leave it on for about two minutes and then i can remove it and hopefully this artery will be useful to us again if we need to recheck and that’s how we get an arterial blood sample.

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