Question

20. order: dopamine 5 mcg/kg/min via infusion. nurse recieves 250 mL of normal saline. patient weight 175lbs

what is the flow rate mL/h? round to nearest whole

25. order: 250 mg IV in 500 mL D5W to infuse at 26 mcg/min.

what is the flow rate mL/h?

29. order: pantoprazole 40mg IV to be given over 2 min. pantopraze has concentrtation of 4mg/mL.

a. what is total volume to be ibfused in mL?

b. calculate the number of mL to be pushed during each 30 second interval in mL? riund to nearest tenth

Answer 1

Q20]

Prescribed rate of infusion : Dopamine 5 mcg/kg/min.

Total volume of the infusion = 250 ml.

Weight of patient : 175 lbs = 79.37 kg.

Rate of infusion prescribed : 5 mcg/kg/min = (5 79.37) mcg/min = 396.85 mcg / min.

Convert mcg/min to mg/hr.

396.85 mcg / min = (396.85 60) / 1000 mg / hour = 23.9 mg / hour.

23.9 mg od Dopamine has to be given in one hour.

Note : The concentration of the solution , that is ,how many mg of Dopamine in 250 ml normal saline is not mentioned in the question...

Assuming that 1 VIAL (= 200MG ) of DOPAMINE IS MIXED WITH 250 ML OF NORMAL SALINE,  

200 mg dopmine is present in : 250 ml normal saline.

Therefore, 23.9 mg of dopamine is present in : (250/200) 23.9 = 29.8 ml / hour.

Q25]  3.12 ml / hour.

The dose prescribed = 26 mcg/min.

First, convert mcg/min to mg/hr.

The dose prescribed = 26 mcg/min = (26 60) / 1000 mg/hour = 1.56 mg / hour.

250 mg is present in 500 ml of D5W.

Therefore, 1.56 mg of the drug is present in : (500/250) 1.56 = 3.12 ml of the solution.

Therefore, the rate of infusion is 3.12 ml / hour.

Q 29]

CALCULATION

Prescribed dose : 40 mg IV over 2 minutes.

4 mg of the drug is present in : 1 ml of the solution.

Therefore, 40 mg of the drug is present in : 10 ml of the solution.

a) Total volume to be infused = 10 ml.

b) Volume to be pushed in 2 min = 10 ml.

Therefore, Volume to be pushed in 30 seconds = 10/4 = 2.5 ml.