Fun fact, small air bubbles won't cause problems. I can't remember how big they have to be. I'm not going to look it up because I don't want to be on a list.
Yeah realistically it isn't a big concern. Like you should try not to inject air into people's veins, but the minimum amount that is likely to cause problems is about 20 cc (which is a lot), but it's likely to take much more than that to be fatal, usually in excess of 150 cc.
Damn for real? Growing up id always heard even the tiniest bubbles can put you into shock/death. Made me terrified for a long while growing up... 20cc is a lot of air!
learned this when i saw an inch long airbubble in an IV line slowly making its way towards my arm and i panic called a nurse who said that it'd take a lot more air than that to cause a problem, but disconnected the line and squeezed the air bubble out anyway.