I wasn’t actually aware of Lidocaine being used as an antiarrythmic until I looked it up, but yeah I can see how an IV infusion would fuck you up quick fast and in a hurry.

As for the air, I was always told the lungs can process about a TOTAL of a shot glasses worth in multiple smaller bubbles moving throughout the body before it causes issues (primarily from a diving context where air embolism is but one concern). Interesting to hear that the actual lethal dose is still considerably more than that, guess that visual guide for people is more the point at which it causes pathological symptoms rather than significant risk of death