Three individuals, each weighing 55 kg and each having a plasma [Na+] of 145 mEq/L, are infused with different solutions
Individual A is infused with 1 L of isotonic NaCl (290 mOsm/kg H2O); individual B is infused with 1 L of a mannitol solution (290 mOsm/kg H2O); and individual C is infused with 1 L of a D5W (5% dextrose) solution (290 mOsm/kg H2O). Assuming that there is no urine output, and after complete equilibration of the ECF and ICF, which of these individuals will have a lower plasma [Na+]?
A. individual A (NaCl infusion)
B. individual B (mannitol infusion)
C. individual C (D5W infusion)
D. individuals A, B, and C will have the same plasma [Na+]
ANS: B
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