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The patient is receiving nitroglycerin 55 mcg/min.

Available: Nitroglycerin in 5% Dextrose Injection 25 mg per 250 mL (100 mcg/mL)

What is the flow rate?

A.

3 mL/hr

B.

55 mL/hr

C.

30 mL/hr

D.

33 mL/hr

Answer and Explanation

The Correct Answer is D

Convert the dosage to mcg per hour:

55 mcg/min × 60 min = 3300 mcg/hr

 

Determine the concentration of nitroglycerin available:

The concentration is 25 mg per 250 mL, which converts to 100 mcg/mL.

Calculate the flow rate in mL per hour using the dosage and concentration:

Flow rate (mL/hr)=(Dose (mcg/hr)/Concentration (mcg/mL))

(3300 mcg/hr100 mcg/mL)=33 mL/hr


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Related Questions

Correct Answer is A

Explanation

Given:

Ordered dose of Heparin: 15 units/kg/hr

Patient weight: 82 kg

Total Heparin in solution: 25,000 units

Volume of solution: 250 mL

Step 1: Calculate the total dose of Heparin in units/hr:

Total dose (units/hr) = Ordered dose (units/kg/hr) x Patient weight (kg)

Total dose (units/hr) = 15 units/kg/hr x 82 kg

Total dose (units/hr) = 1230 units/hr

Step 2: Calculate the concentration of Heparin in the solution:

Concentration (units/mL) = Total Heparin (units) / Volume of solution (mL)

Concentration (units/mL) = 25,000 units / 250 mL

Concentration (units/mL) = 100 units/mL

Step 3: Calculate the infusion rate in mL/hr:

Infusion rate (mL/hr) = Total dose (units/hr) / Concentration (units/mL)

Infusion rate (mL/hr) = 1230 units/hr / 100 units/mL

Infusion rate (mL/hr) = 12.3 mL/hr

Correct Answer is B

Explanation

Given:

Ordered dose of hydrocortisone: 100 mg

Concentration of hydrocortisone: 250 mg/2 mL

Step 1: Set up the proportion:

Desired dose (mg) / Volume to administer (mL) = Concentration (mg/mL)

Step 2: Substitute the values:

100 mg / Volume = 250 mg/2 mL

Step 3: Solve for the unknown volume:

Volume = 100 mg / (250 mg/2 mL)

Volume = 100 mg x (2 mL / 250 mg)

Volume = 0.8 mL

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