A nurse starts an infusion of 1500 mL of normal saline (NS) for a client at 8:45 am at a ﬂow rate of 2 mL/min. The tubing drop factor is 10 drops/mL.
Calculate the volume of ﬂuid that will be left at 10:00 am.

1236 mL

1250 mL

1336 mL

1350 mL

Answer and Explanation

The Correct Answer is D

To find the volume of ﬂuid that will be left at 10:00 am, you need to calculate the following:

- The time elapsed in minutes from 8:45 am to 10:00 am using the formula: Time elapsed (min) = End time (min) - Start time (min)
- The volume of ﬂuid infused in milliliters (mL) during the time elapsed using the formula: Volume infused (mL) = Flow rate (mL/min) x Time elapsed (min)
- The volume of ﬂuid left in milliliters (mL) at 10:00 am using the formula: Volume left (mL) = Initial volume (mL) - Volume infused (mL)

First, use the formula for time elapsed to find how many minutes have passed from 8:45 am to 10:00 am:

Time elapsed (min) = End time (min) - Start time (min)

Since the end time is 10:00 am and the start time is 8:45 am, plug in these values into the formula:

Time elapsed (min) = 600 min - 525 min

Simplify and solve for the time elapsed:

Time elapsed (min) = 75 min

Next, use the formula for volume infused to find the amount of ﬂuid infused in milliliters during the time elapsed:

Volume infused (mL) = Flow rate (mL/min) x Time elapsed (min)

Since the ﬂow rate is 2 mL/min and the time elapsed is 75 min, plug in these values into the formula:

Volume infused (mL) = 2 mL/min x 75 min

Simplify and solve for the volume infused:

Volume infused (mL) = 150 mL

Then, use the formula for volume left to find the amount of ﬂuid left in milliliters at 10:00 am:

Volume left (mL) = Initial volume (mL) - Volume infused (mL)

Since the initial volume is 1500 mL and the volume infused is 150 mL, plug in these values into the formula:

Volume left (mL) = 1500 mL - 150 mL

Simplify and solve for the volume left:

Volume left (mL) = 1350 mL

Therefore, the volume of ﬂuid that will be left at 10:00 am is **1350 mL**.

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Correct Answer is C

Explanation

This answer is correct because BSA is the most accurate method for calculating the child's dose from the adult dose¹². BSA takes into account the child's weight and height, and reﬂects the physiological function and organ growth of the child beter than weight alone¹. BSA can be calculated using a nomogram or a formula based on the child's weight and height¹. The child's dose can then be calculated by multiplying the adult dose by the ratio of the child's BSA to the average adult BSA (1.73 m2)¹. For example:

Child dose by BSA = (mg/day) = Adult Dose in mg/day x BSA in m2 / 1.73

Child dose by BSA = (mg/day) = Adult Dose in mg/m2 x BSA in m2

The other options are not correct because they are not accurate methods for calculating the child's dose from the adult dose. Actual body weight and ideal body weight may not account for individual variations in pharmacokinetics, pharmacodynamics, or clinical response. Actual body height is not a reliable indicator of drug dosage, as it does not reﬂect the body mass or organ function of the child.

A. 0.6 mL B. 0.4 mL C. 1 mL D. 3 mL

Correct Answer is C

Explanation

The nurse should administer 1 mL per dose to the patient.

This answer is correct because it is based on a simple ratio and proportion calculation. The nurse can set up a proportion as follows:

30 mg / 1 mL = 30 mg / x mL

Cross-multiplying and solving for x gives:

x = 1 mL

Therefore, the nurse should administer 1 mL of Toradol injection to deliver 30 mg of the medication to the patient.

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A nurse starts an infusion of 1500 mL of normal saline (NS) for a client at 8:45 am at a ﬂow rate of 2 mL/min. The tubing drop factor is 10 drops/mL. Calculate the volume of ﬂuid that will be left at 10:00 am.

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Naxlex Comprehensive Predictor Exams

The nurse is confirming a pediatric dose from an adult dose sent from the pharmacy. What is an accurate method for calculating the child's dose?

Correct Answer is C

Explanation

A physician orders Toradol (ketorolac) 30 mg IV push every 6 hours x 4 doses. A nurse has Toradol available as a 30 mg/mL injection. How many millilitres per dose should the nurse administer to the patient?

Correct Answer is C

Explanation

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A nurse starts an infusion of 1500 mL of normal saline (NS) for a client at 8:45 am at a ﬂow rate of 2 mL/min. The tubing drop factor is 10 drops/mL.
Calculate the volume of ﬂuid that will be left at 10:00 am.