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- Apr 10, 2007
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So, I tried mixing 10ml of ketamine with 100ml of propofol the other day. as I was doing it, I thought to myself "this won't work, its like mixing oil and water", ans sure enough the two separated just like vinagrette. I brought this to the attention of my attending, who noted that they normally mixed a more concentrated 1ml ket/100ml prop combo, and had never seen this problem before. However, they were mostly using the 1/100 mix, so they admit that a 1ml dose floating on the top may have been overlooked.
It turns out that we had suddenly changed from the Diprivan version ("ask for it by name") to the generic version, and a poll of other attendings turned up no other reports of this occuring with the brand-name.
Makes me wonder it the patients getting Ketofol weren't really just getting only propofol the whole time (untill the end, when they suddenly got a whopping dose of ketamine for dessert)
There is a benzyl alcohol preservative difference between the Diprivan and generic versions.....but I wonder if that is enough.
I mean, why would ketamine, dissolved in what I believe to be a polar solvent, mix with propofol, which is a lipid emulsion? Why would the benzyl alcohol preservative make a diff? Why does everyone say this works in the first place? To me it is totally counter-intuitive.
Does anyone here have any experience with this?
It turns out that we had suddenly changed from the Diprivan version ("ask for it by name") to the generic version, and a poll of other attendings turned up no other reports of this occuring with the brand-name.
Makes me wonder it the patients getting Ketofol weren't really just getting only propofol the whole time (untill the end, when they suddenly got a whopping dose of ketamine for dessert)
There is a benzyl alcohol preservative difference between the Diprivan and generic versions.....but I wonder if that is enough.
I mean, why would ketamine, dissolved in what I believe to be a polar solvent, mix with propofol, which is a lipid emulsion? Why would the benzyl alcohol preservative make a diff? Why does everyone say this works in the first place? To me it is totally counter-intuitive.
Does anyone here have any experience with this?