You need both. Blood transfusions and massive IVs of Ringer’s Solution.
And ventilators. And pressor meds. And platelets. And clotting factors. Etc etc etc.
I had never heard of "Ringer's Solution.
No doubt you are correct.
============================================
From Google: Ringer's solution is the name given to a solution of several salts dissolved in water for the purpose of creating an isotonic solution relative to the bodily fluids of an animal. Ringer's solution typically contains sodium chloride, potassium chloride, calcium chloride and sodium bicarbonate, with the last used to balance the pH. Other additions can include chemical fuel sources for cells, including ATP and dextrose, as well as antibiotics and antifungals.