Question

For a client receiving magnesium sulfate at a rate of 125 ml/hour, how many mg/hour should the nurse administer in an IV infusion of 0.9% normal saline with 4 grams of magnesium sulfate?

a) 40
b) 50
c) 60
d) 70

Answer 1

To calculate the number of mg/hour that should be administered in an IV infusion of 0.9% normal saline with 4 grams of magnesium sulfate, multiply the IV rate, concentration, and molecular weight.

Step-by-step explanation:

To calculate the number of mg/hour that should be administered in an IV infusion of 0.9% normal saline with 4 grams of magnesium sulfate, we can use the following formula:

Mg (mg/hour) = IV rate (ml/hour) x concentration (% w/v) x molecular weight (mg/mmol)

Given that the IV rate is 125 ml/hour and the concentration is 0.9%, we can calculate:

Mg (mg/hour) = 125 ml/hour x 0.9% x (4 g/1000 mg)

Mg (mg/hour) = 125 ml/hour x 0.009 x 4000 mg

Mg (mg/hour) = 450 mg/hour

Therefore, the nurse should administer 450 mg/hour of magnesium sulfate.