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And sometimes it doesn't work. Patients are then given the option of going ahead without sedation, or rescheduling for general anaesthesia.

But even "general anesthesia" still has differing categories.

Surgery uses propofol plus a gas anesthesia for "general anesthesia", but it is considered "general anesthesia" even if only propofol is used.

Hmm, I got one and they used ketamine and an amnesiatic. Not considered general anesthesia but I don't remember a thing. This was in the US.