An IV solution containing aminophylline 2 g in 1000 mL D5W is to be infused at 30 mg/hr. How many milliliters per hour should be administered?
a. 10 mL/hr c. 30 mL/hr
b. 15 mL/hr d. 60 mL/hr
ANS: B
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A Incorrect: This is 2/3 the prescribed dose.
B Correct: Convert the grams to mg = 2000 mg divided by 1000 mL = 0.5 mg/mL; multiply 0.5 mg/mL by 30mg/hr = 15 mL/hr.
C Incorrect: This is twice the prescribed dose.
D Incorrect: This is four times the prescribed dose.
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