Sun10October0740PM 4

A 500 mL bag of 0.18% N. saline with 4% dextrose is set up for an intravenous infusion.

Which of the following best reflects its composition?

(Please select 1 option)

Osmolarity 284 mOsmol/L, sodium 15 mequivalents and glucose 20 g Correct

Osmolarity 293 mOsmol/L, sodium 75 mequivalents and glucose 40 g

Osmolarity 293 mOsmol/L, sodium 30 mequivalents and glucose 20 g

Osmolarity 284 mOsmol/L, sodium 30 mequivalents and glucose 40 g

Osmolarity 293 mOsmol/L, sodium 15 mequivalents and glucose 40 g

Explanation

1 litre of 0.18% N. saline with 4% dextrose contains 30 mmol Na+ and 30 mmol Cl-. Percent (%) is the number of grams of a compound per 100 mL, therefore 1 litre of 4% dextrose dextrose solution contains 40 grams.

A 500 mL bag of 1/5th N. saline and 4% dextrose therefore contains approximately sodium 15 mequivalents and 20 g of glucose. It has an osmolarity of 284, making it hypotonic.

It is no longer regarded as the crystalloid of choice for fluid maintenance in children because of the risk of hyponatraemia.

1000 mL Na+ (mmol/L) Cl- (mmol/L)

0.9% N. saline 154 154

0.45% N. saline 77 77

0.18% N. saline 30 30

Hartmann's 131 111

Answer Statistics

1

49%

2

4%

3

26%

4

16%

5

8%

Times answered: 285