Air in IV lines/syringes

I get so many various answers I'd thought I would throw it out here.

How much air in a IV line is too much?

I am so paranoid about air in lines and syringes. Reason being is that a few years back a coworker of my mom's died after she was injected with too much air from a syringe. A young mom that was in for a D&C to help concieve again. I know it had to be a big error and not just some little air bubble.
A coworker of mine, who is kind of the Cliff Claven of healthcare, likes to share that the Nazis (Mengele) did research on this very topic, and they found that it takes nearly a whole IV line of air in the IV in order to cause death. The body is generally very good at breaking down the air. For me, if it's less than 1/2 -1" of air, I don't worry about it, I will just tap it to break it up a bit. I know that patients get very worried when they see the smallest air bubble in the line, so I reassure them that it's not like in the movies, where one tiny bubble is going to cause harm.

Out of curiosity, I did a quick google and an article I read said that "as little as 20ml" can cause 'some problems'" (that is the amount of an unprimed IV line), and that between 100-300ml can be fatal. So that's the amount of 5-15 IV lines. That's a whole lot of air.

I don't have exact numbers, but when someone is having a 'bubble test' echo done, they get 20 or so mL of agitated saline (lots of air bubbles in it) injected and I've never heard of anyone dying from it. Incidentally, bubble tests are really fun to watch.

Thanks everyone. That helps alot.

Our work Claven said that the whole line test was done on dogs. I asked a pulmonologist who said that sounded about right though. I still try to get all the bubbles I can out though.Quote from kloneA coworker of mine, who is kind of the Cliff Claven of healthcare, likes to share that the Nazis (Mengele) did research on this very topic, and they found that it takes nearly a whole IV line of air in the IV in order to cause death. The body is generally very good at breaking down the air. For me, if it's less than 1/2 -1" of air, I don't worry about it, I will just tap it to break it up a bit. I know that patients get very worried when they see the smallest air bubble in the line, so I reassure them that it's not like in the movies, where one tiny bubble is going to cause harm.

Quote from kloneA coworker of mine, who is kind of the Cliff Claven of healthcare, likes to share that the Nazis (Mengele) did research on this very topic, and they found that it takes nearly a whole IV line of air in the IV in order to cause death.

Quote from teeniebertI don't have exact numbers, but when someone is having a 'bubble test' echo done, they get 20 or so mL of agitated saline (lots of air bubbles in it) injected and I've never heard of anyone dying from it. Incidentally, bubble tests are really fun to watch.

Quote from RedCellI was going to mention that most people have no idea how much air gets into the right side of the heart until they have seen what the TEE can reveal. Basically, unless you have communication between the right and left atria or ventricles there is really very little to worry about. All that air in your line simply goes through the pulmonary arteries, diffuses through the alveoli and out through the pie hole.

FWIW, our Pharm instructor told us that up to 40 ml was "safe" but I've read other research that indicates that there is no "safe" number. What causes seemingly no problems with one person may be enough to kill another. I think it's always the safest practice to get rid of air whenever we can.

Quote from SweetOldWorldThink for a moment about what you have posted here. I am horrified that a professional nurse could casually post secondhand comments about Nazi "research" as if it had any legitimate meaning in practice. If such "research" was even done in the first place, that is. I would hope we could base our practice on legitimate, peer-reviewed research. Not garbage like this.

Quote from RedCellI was going to mention that most people have no idea how much air gets into the right side of the heart until they have seen what the TEE can reveal. Basically, unless you have communication between the right and left atria or ventricles there is really very little to worry about. All that air in your line simply goes through the pulmonary arteries, diffuses through the alveoli and out through the pie hole.Sweetoldworld, don't be so fast to criticize your peers. Much of our advancements and current practice in medicine as well as nursing is based on discoveries made by the United States and others engaged in conflict with other nations (WAR). Nazis DEFINITELY included.

Sweet I do not know why your attacking the other poster about the nazis because the medical information they gathered (though it was in a horrible way) has been used today. Especially information about hypothermia. I know that it was not gotten the correct way but should we ignore information that might save others?