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That is a blankety false statement mate. It's not used on nearly every patent, it's VERY rarely used for anesthesia. Very rarely.

I am a board certified anesthesiologist in the USA. What is your justification or source for calling this false?

Fentanyl is given to nearly every patient prior to intubation and frequently redosed throughout most operations.

Once again, the hubris of HN users comes back to bite them!