Personally, I would also insert a comma before the "as per the NICE guidelines"
so:
"With regards to patient B, the plan of care was to act upon her low body temperature and to set about returning it to normal, as per the NICE guidelines."
sorry, I just meant write "regard", singular, rather than "regards". But as slaney suggested, you could do without it, just put Patient B into the sentence elsewhere.
ilmb
Did you remember to give NICE its full title when you first referred to it? For example, you could write The National Institute for Health and Clinical Excellence (NICE) Or NICE (The National Institute for Heath and Clinical Excellence). Only then then can you continue to use the acronym.
It might also strengthen your work if you could include the year the current guidelines were published.