When is dextrose vs normal saline iv fluids given to patients? whats, diff.significance of each fluid?

Sugar vs salt: Saline by itself is used to keep blood volume up. It doesn't contain any nutrients, unlike dextrose, which is essentially glucose. Every cell in the body depends on glucose for fuel. It may be given alone, though often it's combined with other solutions containing various concentrations of sodium and sometimes potassium as well as whatever else might be needed.