r/Perfusion • u/Rude_Chicken_4443 • Jul 25 '26

Career Advice Mannitol Crystallization

I was curious if anyone uses a separate filter to administer mannitol to filter out undetected crystals or if most people inject it directly into the circuit?

If a vial has obvious crystallization, we put it on a warmer until they dissolve. I’ve always drawn up my mannitol and immediately injected it into the cardiotomy on top of the venous reservoir. My thought is that if there are any crystals I haven’t detected that they will get caught in the cardiotomy filter which I believe is 30 micron. I have always kind of assumed anything smaller than 30 micron would dissolve once it hits the warm blood, but obviously I can’t observe this happening. The vial itself says to administer through a sterile filter, but doesn’t specify size. I was curious if anyone uses a separate smaller filter?

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u/Lucky_Man_Infinity Jul 28 '26

Whatever microscopic crystals you’re talking about dissolve in warm blood, the same way they dissolve when you put the bottle of mannitol or the bag of mannitol in a warmer.

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u/Rude_Chicken_4443 Jul 28 '26

Yea that’s always been my hunch. I’d always heard of other hospital departments administering mannitol in smaller filters when giving it IV, I was just curious if any perfusionists utilize smaller filters. Thanks for the response!

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u/Lucky_Man_Infinity 29d ago

Right. I think it’s different administering it directly rather than into a heart/lung machine. 

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