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At one of my ER's, the ED / ENT was numbing a guys throat to do a PTA or direct laryngoscopy or something. I can't remember the procedure. They gave nebulized 4% lidocaine and put lido directly on the tongue. Maybe they even numbed the back of the throat with a needle. I don't recall the specifics but I do recall the pt developing uncontrollable seizures, needing intubation and ICU admission.
We do local injections in the throat/neck and put lido directly on the tongue all the time for awake fiberoptics. Maybe he didn't pull back to check for blood and hit the artery.