Use the principles described in Fluids basics to approach this problem logically. Go back to those pages to look things up when necessary.
A complicated case. But exactly the same principles apply.
5 days after a liver transplant, a 48 year old man has a pyrexia of 40.8 degrees C. His charts for the last 24 hours reveal:
2 units (350 ml each)
On examination he has a tachycardia. His supine BP is OK, but you can’t sit him up to check his erect BP. His serum [Na+] is 140 mmol/l.