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Why isn't injection given into artery rather than vein?

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Why isn't injection given into artery rather than vein?

Postby jackson6612 » Fri Oct 05, 2007 11:31 pm

Why isn't injection given into artery rather than vein? I know vein carries the blood back to the heart, where heart will pump it again. But blood in the artery also have sufficient pressure to distribute the liquid drug inserted through the action of injection.
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Postby raghda » Fri Oct 05, 2007 11:59 pm

There are 2 reasons for this :
1) the artery is highly sensative as it is supplied by vasa vasorum branches from nerves ,so when you inject someone in artery he will yell and cry from pain.
2) the injection will be resisted by the high arterial pressure , you may feel slightly throw away of the injection

but in some cases or tests injection is taken in artery
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Postby kotoreru » Sat Oct 06, 2007 12:30 pm

One such test done using the artery is the blood gas test. I probably don't need to explain it, just rest assured that it HURTS LIKE HELL.
"What are humans if they don't learn at University? Animals, yes."

^^One of my ex-girlfriends said that. I stress the ex part.
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Postby jackson6612 » Sat Oct 06, 2007 6:35 pm

kotoreru wrote:One such test done using the artery is the blood gas test. I probably don't need to explain it, just rest assured that it HURTS LIKE HELL.


Please explain your answer.

Best wishes, Jackson
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Postby kotoreru » Sat Oct 06, 2007 10:37 pm

Fine. Hypodermic placed into an artery, which is harder to find than a vein. This hurts. Blood taken out under pressure and tested for 02 content among other things. Leaves a bruise for weeks.
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Postby jackson6612 » Sun Oct 07, 2007 9:34 am

kotoreru wrote:Fine. Hypodermic placed into an artery, which is harder to find than a vein. This hurts. Blood taken out under pressure and tested for 02 content among other things. Leaves a bruise for weeks.


Please explain your above statement in red. Thanks
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Postby kotoreru » Sun Oct 07, 2007 10:03 am

What's the major difference between the blood flowing through arteries and veins? Oxygenation, yes? We take blood from the artery for the blood gas test because we can test this blood for it's oxygen saturation i.e. how much oxygen there is per ml, to get an idea of how much oxygen is getting to the tissues or how efficient the lungs are.

Of course, while we're there we can test for CO2 and other forms in the plasma etc.

Is that ok?
"What are humans if they don't learn at University? Animals, yes."

^^One of my ex-girlfriends said that. I stress the ex part.
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