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Diluents and IV homework

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  • Diluents and IV homework

    Hi,

    Can someone explain why intravenous drugs are infused in certain bags of fluids? i.e. sodium chloride 0.9% or dextrose or glucose.
    I've read that it is to do with the diluents being isotonic and that blood has a similar isotonicity - however I'm not really understanding it.

    So if I gave a patient cefalexin IV (for example) in normal saline, what problems do I avoid compared to if I gave it in normal water?
    Surely in patients that have hypernatraemia, it would cause issues?

    I've seen instructions for water for injection to be used the same way as saline so I'm confused as to how the same principle applies.

    Thanks.

  • #2
    Google is your friend. Look up osmosis. Blood is equivalent to Normal Saline and therefore usually we try to match this. I make up Normal saline (9 grm/litre)to use in an eye lotion to avoid stinging..
    johnep

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