If you put sodium ascorbate in a Lactated Ringer's solution like Cathcart did, you can have major problems with hypertonicity, causing Central Pontine Myelinosis or other problems.
I think it is prudent to suggest that nobody do so and that his protocol should be evaluated.
We should not be advocating using someone's protocol without having full medical knowledge.
There is too much "i think this is fine" or "cathcart's guidelines seem to indicate that's no problem," without being MDs and knowing what's going on.