A physician orders magnesium sulfate, 6 grams loading dose to be administered over 30 minutes. There are 40 grams of magnesium sulfate in the IV bag. What is the rate per hour to administer the loading dose?

75 mL/hr

150 mL/hr

300 mL/hr

450 mL/hr

Answer and Explanation

The Correct Answer is C

To calculate the rate per hour, divide the amount of magnesium sulfate to be administered by the concentration of magnesium sulfate in the IV bag:

6 grams ÷ 40 grams = 0.15

Then, multiply the result by the volume of the IV bag, which is usually 1000 mL: 0.15 x 1000 mL = 150 mL

This is the amount of fluid that contains 6 grams of magnesium sulfate. To administer this amount over 30 minutes, multiply by 2 to get the rate per hour:

150 mL x 2 = 300 mL/hr.

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Correct Answer is D

Explanation

To calculate the amount of drug per minute, divide the total dose by the infusion time in minutes:

5 mg ÷ 2 minutes = 2.5 mg/minute

The patient should receive 2.5 mg of Lopressor per minute for 2 minutes to get a total dose of 5 mg.

A. 41.67 mL/hr B. 166.67 mL/hr C. 250 mL/hr D. 1000 mL/hr

Correct Answer is B

Explanation

To calculate the flow rate in mL/hr for a continuous infusion, we need to divide the total volume to be infused by the total time of infusion, and then convert the units as necessary.

In this case, the total volume is 2.5 L, which is equivalent to 2500 mL (1 L = 1000 mL), and the total time is 15 hours.

Flow rate = Total volume to be infused / Total time of infusion Flow rate = 2500 mL / 15 hours

Flow rate = 166.67 mL/hr

Therefore, the flow rate for continuous infusion of 0.9% sodium chloride solution in this case is 166.67 mL/hr.

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A physician orders magnesium sulfate, 6 grams loading dose to be administered over 30 minutes. There are 40 grams of magnesium sulfate in the IV bag. What is the rate per hour to administer the loading dose?

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Naxlex Comprehensive Predictor Exams

A patient is ordered 5 mg of IV Lopressor (metoprolol tartrate) to be administered over 2 minutes. The concentration is 1 mg/mL. How many milligrams per minute should the patient receive?

Correct Answer is D

Explanation

A physician gives the following order: "Infuse 0.9% sodium chloride solution, 2.5 L over 15 hours." What is the mL/hr flow rate for continuous infusion?

Correct Answer is B

Explanation

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A physician orders magnesium sulfate, 6 grams loading dose to be administered over 30 minutes. There are 40 grams of magnesium sulfate in the IV bag. What is the rate per hour to administer the loading dose?

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