On Tue, 20 Aug 2019 at 19:31, Sean Breheny wrote: > My $0.02 on a few quick items: > this is why they typically sedate you with some other agent first (usually intravenous although it could be nitrous oxide) and then begin administering the inhaled anesthetic. They'd have to be pretty sophisticated to make this work right by feeding N2O first through a pipe and then some other anesthetic (N2O doesn't render you completely unconscious and you recover very quickly when exposed to clean air). Large quantities of these expensive agents would be needed and there would be a lingering smell. My experience of pre-meds was stunning. C4-5 spinal fusion. As we were about to enter the operating room. "I'll just give you a shot of premeds ..." I have no recollection of anything from that moment until waking up in intensive care. He was very proud latterly. I was annoyed. I value (no doubt strangely) the rigmarole of preparation for operation (not that I've had overly many). To (presumably) experience that, but to lose it entirely from memory, was disturbing. Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .