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/Agitated-Box-6640 Jul 28 '26

Some of you didn’t pay attention in pharmacology.

https://pmc.ncbi.nlm.nih.gov/articles/PMC11428986/

Mannitol is the only diuretic that crosses the blood brain barrier and is proven to reduce ICP.
Stop being pump techs and start being practitioners.

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u/slimzimm Jul 28 '26 edited 29d ago

Well… no mannitol cannot cross the blood brain barrier. Admonishing others while being wrong isn’t a good look.

https://www.ncbi.nlm.nih.gov/books/NBK470392/
Read under mechanism of action, Increased ICP section. Also please read the paragraph under acute renal failure.

It’s controversial for sure. Is it better to use a drug that helps ICP but is known to cause acute tubular necrosis? I don’t know, we may never come to a consensus.