MedStudentt
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Report Thread starter 8 months ago
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Why would a pt with cerebral oedema be ordered 3% saline which is a hypertonic solution?

My reasoning is if it's hypertonic, it contains more Na+ ions so it would move from here into the brain, taking water with it?

I'm really struggling with fluids at the moment so hoping someone can help! Thank u xx
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vet2269
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Hello!Hypertonic saline has higher NaCl than normal plasma. By giving a hypertonic saline into the blood (plasma), it creates an osmotic gradient so more fluid is pulled from interstitial fluid and intracellular fluid into circulating blood, therefore raising blood volume and blood pressure. So if he has cerebral oedema, fluid will move from this watery low Na area into the blood (from an area of high water, low salt to a low water high salt area), thus decreasing the oedema x
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