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A continuous heparin infusion is to begin at 15 units/kg/hr for a client weighing 82 kg. Available: 25,000 units of heparin in 250 mL D5W. Calculate the mL/hr. (the pump is capable of delivering in tenths of an mL).

A.

12.3 mL/hr

B.

123 mL/hr

C.

125 mL/hr

D.

12 mL/hr

Answer and Explanation

The Correct Answer is A

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

 


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Related Questions

Correct Answer is A

Explanation

Given:

Ordered dose of Heparin: 18 units/kg/hr

Patient weight: 123 pounds

Concentration of Heparin: 25,000 units/250 mL (100 units/mL)

Step 1: Convert patient weight from pounds to kilograms:

1 pound (lb) = 0.453592 kilograms (kg)

Patient weight in kg = 123 lbs x 0.453592 kg/lb = 55.7923 kg

Step 2: 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) = 18 units/kg/hr x 55.7923 kg

Total dose (units/hr) = 1004.2614 units/hr

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

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

Infusion rate (mL/hr) = 1004.2614 units/hr / 100 units/mL

Infusion rate (mL/hr) = 10.042614 mL/hr

Step 4: Round to the nearest tenths:

Infusion rate (mL/hr) ≈ 10.0 mL/hr

Correct Answer is D

Explanation

Given:

Total Heparin in solution: 25,000 units

Volume of solution: 250 mL

Infusion rate: 11 mL/hr

Step 1: 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 2: Calculate the infusion rate in units/hr:

Infusion rate (units/hr) = Infusion rate (mL/hr) x Concentration (units/mL)

Infusion rate (units/hr) = 11 mL/hr x 100 units/mL

Infusion rate (units/hr) = 1100 units/hr

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