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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.

A.

6.5 mL/hr

B.

9.6 mL/hr

C.

10.1 mL/hr

D.

14.8 mL/hr

Answer and Explanation

The Correct Answer is A

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.


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Related Questions

Correct Answer is B

Explanation

To find the flow rate in mL/hr, you need to use the formula for infusion rate:


Infusion rate (mL/h) = Total volume (mL) / Time (h)


Since the total volume is 2.5 L and the time is 15 hours, plug in these values into the formula:


Infusion rate (mL/h) = 2.5 L / 15 h


However, before you can simplify and solve for the infusion rate, you need to convert the volume from liters to milliliters by multiplying by 1000:


Infusion rate (mL/h) = 2500 mL / 15 h

Simplify and solve for the infusion rate:


Infusion rate (mL/h) = 166.67 mL/h


Therefore, the flow rate for continuous infusion is **166.67 mL/h**.

Correct Answer is A

Explanation

To calculate the dose in milligrams per hour, we need to convert the patient's weight from pounds to kilograms.

Patient's weight: 110 lb

To convert pounds to kilograms, we use the conversion factor: 1 lb = 0.4536 kg

Patient's weight in kilograms: 110 lb * 0.4536 kg/lb = 49.895 kg (rounded to 3 decimal places

The physician has ordered Dobutamine at a dose of 10 mcg/kg/min.

Dose required = 10 mcg/kg/min * 49.895 kg = 498.95 mcg/min

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

498.95 mcg/min = 0.49895 mg/min

Finally, to determine the dose in milligrams per hour, we multiply the dose in milligrams per minute by 60 minutes to convert it to an hourly rate.

0.49895 mg/min * 60 min/hr = 29.937 mg/hr (rounded to 3 decimal places)

Therefore, the correct answer is:

a. 30 mg/hr

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