In medical literature, the MINIMUM reported amount of air needed to cause an issue is 30cc pumped straight into a vein (but most sources will say well over 100cc). And that's going to be an 85 year old woman with 20 health problems (your typical hospital patient). Patients get pumped with entire IV lines full of air by accident all the time without issue.
Worrying about injecting air is a joke, unless you're shooting straight for the carotid artery.




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