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 A

Explanation

To find the rate in mL/hr, you need to calculate the following:

- The concentration of nitroglycerin in the IV solution in mcg/mL
- The infusion rate in mL/hr using the formula: Infusion rate (mL/h) = (Dose (mcg/min) x 60 min/h) / Concentration (mcg/mL)

First, convert the concentration of nitroglycerin from mg to mcg by multiplying by 1000:

125 mg x 1000 = 125,000 mcg

Then, divide the amount of nitroglycerin by the volume of the IV solution to get the concentration in mcg/mL:

125,000 mcg / 500 mL = 250 mcg/mL

Next, plug in the values into the formula for infusion rate:

Infusion rate (mL/h) = (42 mcg/min x 60 min/h) / 250 mcg/mL

Simplify and solve for the infusion rate:

Infusion rate (mL/h) = 10.08 mL/h

Therefore, the nurse should program the IV pump to deliver **10.1 mL/h** to infuse nitroglycerin at 42 mcg/minute.

A. 78 mL/hr B. 105 mL/hr C. 60 mL/hr D. 16 mL/hr

Correct Answer is A

Explanation

To calculate the infusion rate, we need to convert the patient's weight from kilograms to milligrams.

Patient's weight: 65 kg

Dose required: 200 mcg/kg/min

First, let's calculate the total dose required for the patient per minute: Dose required = 200 mcg/kg/min * 65 kg

= 13,000 mcg/min

Next, we need to convert the dose from micrograms to milligrams:

13,000 mcg/min = 13 mg/min

Now, let's determine the infusion rate. We have 2,500 mg of esmolol in 250 mL of ﬂuid. Therefore, the concentration of esmolol in the ﬂuid is:

Concentration = 2,500 mg / 250 mL

= 10 mg/mL

To find the infusion rate, we divide the dose required by the concentration: Infusion rate = 13 mg/min / 10 mg/mL

= 1.3 mL/mi

Since the options are in mL/hr, we need to convert the rate from mL/min to mL/hr:

1.3 mL/min * 60 min/hr = 78 mL/hr

Therefore, the correct answer is:

a. 78 mL/hr

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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

Nitroglycerin 125 mg diluted in 500 mL of D5W (dextrose 5% in water) is infusing at a rate of 42 mcg/minute for a patient with chest pain. What rate (in mL/hr) should the nurse program into the IV pump to deliver this dose? Round your answer to the nearest tenth.

Correct Answer is A

Explanation

A nurse needs to infuse esmolol to a patient weighing 65 kg. The dose on hand is 2,500 mg esmolol in 250 mL of ﬂuid. The patient requires a dose of 200 mcg/kg/min to control a hypertensive crisis. Which rate should the nurse calculate to infuse this medication? Round to the nearest whole number.

Correct Answer is A

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.